Influence of carbon-partitioning treatment on the microstructure, mechanical properties and wear resistance of in situ VCp-reinforced Fe-matrix composite

Ping-hu Chen, Yun Zhang, Rui-qing Li, Yan-xing Liu, Song-sheng Zeng

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Ping-hu Chen, Yun Zhang, Rui-qing Li, Yan-xing Liu, and Song-sheng Zeng, Influence of carbon-partitioning treatment on the microstructure, mechanical properties and wear resistance of in situ VCp-reinforced Fe-matrix composite, Int. J. Miner. Metall. Mater., 27(2020), No. 1, pp.100-111. https://dx.doi.org/10.1007/s12613-019-1909-3
Ping-hu Chen, Yun Zhang, Rui-qing Li, Yan-xing Liu, and Song-sheng Zeng, Influence of carbon-partitioning treatment on the microstructure, mechanical properties and wear resistance of in situ VCp-reinforced Fe-matrix composite, Int. J. Miner. Metall. Mater., 27(2020), No. 1, pp.100-111. https://dx.doi.org/10.1007/s12613-019-1909-3
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碳分配处理对原位VCp增强铁基复合材料组织、力学性能和耐磨性的影响

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Influence of carbon-partitioning treatment on the microstructure, mechanical properties and wear resistance of in situ VCp-reinforced Fe-matrix composite

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    Corresponding author:

    Rui-qing Li E-mail: liruiqing@csu.edu.cn

    Song-sheng Zeng E-mail: zsscsu@sina.com

  • Funds: This work was financially supported by China Postdoctoral Foundation (No. 2019M650339), Guangdong Basic and Applied Basic Research Foundation (No. 2019A1515011858), Hunan Provincial Natural Science Foundation, China (No. 2019JJ50807), State Key Laboratory of High Performance Complex Manufacturing, China (No. ZZYJKT2017-01), DGUT Innovation Center of Robotics and Intelligent Equipment of China (No. KCYCXPT2017006), and Key Laboratory of Robotics and Intelligent Equipment of Guangdong Regular Institutions of Higher Education, China (No. 2017KSYS009)
  • Received: 30 May 2019; Revised: 24 September 2019; Accepted: 26 September 2019; Available online: 28 October 2019

The wear resistance of iron (Fe)-matrix materials could be improved through the in situ formation of vanadium carbide particles (VCp) with high hardness. However, brittleness and low impact toughness limit their application in several industries due to addition of higher carbon content. Carbon-partitioning treatment plays an important role in tuning the microstructure and mechanical properties of in situ VCp-reinforced Fe-matrix composite. In this study, the influences of carbon-partitioning temperatures and times on the microstructure, mechanical properties, and wear resistance of in situ VCp-reinforced Fe-matrix composite were investigated. The experimental results indicated that a certain amount of retained austenite could be stabilized at room temperature through the carbon-partitioning treatment. Microhardness of in situ VCp-reinforced Fe-matrix composite under carbon-partitioning treatment could be decreased, but impact toughness was improved accordingly when wear resistance was enhanced. In addition, the enhancement of wear resistance could be attributed to transformation-induced plasticity (TRIP) effect, and phase transformation was caused from γ-Fe (face-centered cubic structure, fcc) to α-Fe (body-centered cubic structure, bcc) under a certain load.

 

  • Over the last few decades, advances in nanoscience have promoted explosive progress in several areas of research [18]. Among the numerous nanoscale materials obtained thus far, metal nanoclusters (NCs) consisting of several to hundreds of atoms have attracted broad attention [918]. Compared with atoms, molecules, and nanocrystals, metal NCs present two unique characteristics. First, the sizes of NCs fall between those of nanocrystals and atoms/molecules and are comparable with the Fermi wavelength of electrons; thus, NCs display discrete electronic states and size-dependent band gaps. Second, NCs are usually denoted Mn(SR)m, where n and m are the numbers of metal atoms and ligands, respectively, and have particular metal–kernel and metal–ligand interfacial structures. Hence, NCs are essentially inorganic–organic hybrid compounds possessing distinct absorption and inter-particle packing properties. These characteristics endow NCs with distinct physical and chemical properties, such as abundant surface and interfacial sites [19], enhanced photoluminescence [2021], magnetism [22], and nonlinear optical properties. Consequently, metal NCs have found enormous potential applications in the areas of energy conversion [15], catalysis [19], biomedicine [23], bioimaging [20,24], and sensors.

    Among the various NCs currently available, gold NCs are the most extensively studied owing to their high stability. Several well-defined gold NCs, such as Au22 [25], Au25 [26], Au36 [27], Au38 [28], and Au144 [29], have been reported. However, fewer examples of Ag NCs have been synthesized compared with Au NCs. Thus, more efforts should be taken to prepare Ag NCs. Several physical and chemical means have been exploited to produce the NCs, and these methods can be divided into two categories, namely, thermodynamic and kinetics methods. Some NCs of a certain size and stability have been obtained via the thermodynamic method. Jin et al. [30], for example, devised a size-focusing methodology to synthesize atomically precise metal NCs based on different-sized nanoparticles with vastly different stabilities. Most NCs, such as Au25, Au38, and Au144, are prepared through this method. Sonochemical and microwave-assisted green approaches have also been employed to prepare highly fluorescent, stable, and water-soluble Ag NCs in the presence of polymethylacrylic acid and polymethylacrylic acid + sodium salt respectively [3132]. Pradeep’s group [3334] reported high-temperature and sunlight-mediated means to synthesize glutathione-protected atomically precise Ag NCs with luminescent and antibacterial properties. Unlike the thermodynamic method, kinetically controlled synthesis could yield NCs with well-defined sizes depending on the deliberate regulation of the kinetics of the reduction process. Ag9(H2MSA)7 has been successfully prepared via a solid-state route in which the rate of reaction was decreased in contrast with that in solution reduction [35]. Adjusting the reaction temperature and stirring rate, regulating the pH of the solution, and selecting weak reducing agents are feasible methods to control the kinetics of the reduction process [26,3637].

    In this work, we demonstrate a kinetically controlled strategy to synthesize Ag NCs in high purity via a one-pot method. The reaction system employs a mild reducing agent, NaBH3CN, to create a gentle environment. The resulting Ag NCs were supported on activated carbon (AC) to form Ag NCs/AC, which displayed excellent activity and stability for the catalytic reduction of 4-nitrophenol (4-NP).

    AgNO3 (>99.999%), D-penicillamine (99%), NaBH3CN (99%), NaBH4 (99%), α-cyano-4-hydroxycinnamic acid (CHCA, 98%,), and 4-NP (99%) were obtained from J&K Scientific Ltd., China. Methanol and ethanol were purchased from Sinopharm Chemical Reagent Co., Ltd., China (AR). Ultrapure water (18.2 MΩ) was used in all experiments.

    The synthesis of Ag NCs was conducted under an air atmosphere. In a typical reaction, AgNO3 (0.021 g, 0.125 mmol) was dissolved in ultrapure water (5 mL), and the resulting solution was cooled to 5°C, D-penicillamine (0.075 g, 0.5 mmol) was taken up in 5 mL of ultrapure water and then transferred to the cooled AgNO3 solution via syringe. The resulting mixture was stirred at 5°C. After 20 min, 3 mL of an ice-cold aqueous solution of NaBH3CN (0.079 g, 1.25 mmol) was quickly added to the above mixture under vigorous stirring. The reaction was aged for 4 h at 5°C and 5 h at room temperature to ensure complete reaction. The product was isolated by centrifugation, and the precipitate was discarded. Excess methanol was added to the supernatant, and the mixture was allowed to stand at 4°C for 3 h. The precipitated solid was purified repeatedly by centrifugation. Finally, the Ag NCs were dried overnight in a vacuum at room temperature.

    In a typical experiment, 10 mg of AC (XC-72) was dispersed in 15 mL of ultrapure water under ultrasonication for 20 min. Then, 0.2 mL of Ag NCs dissolved in ultrapure water (1 mg/mL) was added to the above AC suspension. The catalysts were separated by centrifugation at 10000 r/min after stirring for 12 h. A clear supernatant solution indicated the nearly complete absorption of NCs on the support. The catalysts were washed thrice with ultrapure water and ethanol in turn. Finally, the catalysts were dried for 5 h in a vacuum at room temperature and dispersed in water for further use.

    Ultraviolet visible (UV–Vis) absorption data were collected by a UV-3600 UV–Vis-NIR spectrophotometer (Shimadzu, Japan). Transmission electron microscopy (FEI Technai-F30, USA) with an accelerating voltage of 200 kV was employed to observe the size and morphology of the Ag NCs. The size distributions of the Ag NCs were analyzed using Nano Measurer software. Proton nuclear magnetic resonance (1H-NMR) experiments were conducted using a 500 MHz Advance NMR spectrometer (Bruker, Germany). The Ag NCs and D-penicillamine were dissolved in deuterium oxide, and TMS was used as an internal standard. Matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) was conducted on an Autoflex Max MALDI-TOF mass spectrometer (Bruker, Germany). X-ray photoelectron spectroscopy (XPS) measurements were performed using a VG Thermo ESCALAB 250 spectrometer (VG Scientific, USA) operated at 200 W. Binding energies were calibrated against the C 1s line. Fourier-transform infrared spectroscopy (FTIR) was conducted using a NICOLET iS50 FT-IR (Thermo Scientific, USA). Thermogravimetry (TG) experiments were performed on a TG209F1 instrument (Netzsch, Germany).

    A mixture of 4-NP (7 mg, 0.03 mmol) and Ag NCs/AC (10 mg) was dissolved in 15 mL of ultrapure water. Then, excess NaBH4 (38 mg, 1.0 mmol) was added to the above suspension, and the mixture was stirred at room temperature. UV–Vis absorption was used to monitor the progress of the reaction at different time intervals. The catalysts were centrifuged and washed thrice with ultrapure water for the next cycle after completion of the catalytic reaction.

    The kinetics of a reduction process plays a great role in the preparation of NCs. Changes in the reducing agent and temperature and introduction of additives are feasible means to control the kinetics of a reduction process. In our previous work, NaBH4, a strong reducing agent, was used to prepare penicillamine-protected Ag20 NCs [38]. In the present work, NaBH3CN, a weak reducing agent, was used to control the reduction kinetics. UV–Vis absorption was employed to track the process of NC formation (Fig. 1(a)). At the initial stage of the preparation process, a distinct peak at 518 nm corresponding to Ag20 NCs was observed; this peak decomposed rapidly within 2 h. The peak at 425 nm (Fig. 1(a)) corresponding to Ag nanoparticles revealed weakening and red-shifting during the reaction process, thereby indicating that the Ag nanoparticles were transformed into smaller-sized NCs. Peaks at 600 and 660 nm emerged and gradually intensified, thus suggesting that new NCs with contents increasing with the reaction time are formed.

    Figure  1.  (a) UV–Vis absorption spectra of products at different reaction times. The inset shows photographs of the products. (b) UV–Vis absorption spectrum of the as-synthesized Ag NCs. The inset shows a photograph of the as-synthesized Ag NC aqueous solution.

    The solution color may also reflect the progress of the formation of NCs. During the preparation of Ag20 NCs, the solution turned from colorless to black within several minutes after the addition of NaBH4, which indicates that some large-sized Ag nanoparticles were formed at the initial stage and that the reduction process proceeded rapidly. In the present work, the solution first changed to brownish red (inset, Fig. 1(a)) when the reducing agent was introduced, thus suggesting that small-sized NCs were produced at this stage. In general, the size distribution of the precursor remarkably influences the size of the final NCs. Thus, the NCs formed under mild reducing condition in this work should be different from the Ag20 NCs. In the present work, the color of the Ag NCs was dark green (inset in Fig. 1(b)) while that of the Ag20 NCs was deep red [38]. The different size distributions of the precursors may further be reflected by the reaction time. During the preparation of Ag20 NCs, the large mass of Ag nanoparticles formed at the initial stages of the reaction required a long time for etching. By contrast, the small-sized NCs and few Ag nanoparticles produced in the present work were easily transformed into the final NCs. Therefore, 48 h was needed to produce Ag20 NCs [38], but only 9 h was necessary to complete the reaction in the present work.

    The as-synthesized Ag NCs displayed optical properties different from those Ag NCs reported earlier, such as Ag7(H2MSA)7 [39], Ag8(H2MSA)8 [39], Ag9(H2MSA)7 [35], Ag11(SG)7 [40], Ag14(SG)11 [41], Ag32(SG)19 [42], and Ag44(SR)30 [43]. Three distinct peaks at approximately 456, 600, and 660 nm were observed in the UVVis absorption spectrum of the as-synthesized Ag NCs (Fig. 1(b)), which indicates that the product is of high purity; a mixture of several NCs with different sizes usually yields a featureless absorption spectrum. The presence of Ag nanoparticles could be excluded because no surface plasmon resonance absorption was observed in the absorption spectrum obtained. According to previous reports [39], the absorption peaks at 600 and 660 nm are induced by intra-band sp → sp transitions while the absorption peak at 456 nm is due to inter-band ligand/d-band → sp-band transitions.

    MALDI-TOF MS was used for ionization and molecular weight measurements with CHCA as the matrix to confirm the molecular composition of the as-synthesized Ag NCs. Two peaks at approximately m/z 6796 (m is the mass and z is the electrical charge) and 8844 were detected in negative mode (Fig. 2(a)). However, the precise composition of the as-synthesized Ag NCs could not be confirmed on account of the low resolution of the signals. Thus, TG was employed to confirm the molecular composition of the NCs (Fig. 2(b)). The peaks at m/z 6796 and 8844 were assigned to Ag41(D-pen)16 (D-pen: D-penicillamine) and Ag49(D-pen)24, respectively. Ag41(D-pen)16 may be a fragment of Ag49(D-pen)24 because the absorption spectra obtained indicate that the as-synthesized Ag NCs is of high purity.

    Figure  2.  (a) MALDI-TOF MS spectrum of the as-synthesized Ag NCs in negative mode. (b) Mass change of the Ag NCs vs. temperature in a nitrogen atmosphere.

    NMR spectroscopy is a useful method to probe the chemical environments and staple motif structures of metal–ligand interfaces. 1H-NMR of both the Ag NCs and D-penicillamine was conducted (Fig. 3(a)). The spectrum of Ag NCs showed two broad peaks while that of D-penicillamine revealed three intense peaks. The merging of the two intense peaks corresponding to –CH3 groups could be attributed to rapid location changes of the two –CH3 groups on the surface of the NCs. The relevant peaks of the NCs broadened in comparison with those of D-penicillamine, and this phenomenon may be induced by minor differences in the staple motif structure of Ag NCs. In addition, all peaks in the spectrum of Ag NCs appeared downfield relative to those of D-penicillamine, which indicates that protons in the staple motif are affected by the –SH group, which is considered to transfer electrons to the Ag core when the S–Ag bond is formed. The FTIR spectra of Ag NCs and D-penicillamine are given in Fig. 3(b). The spectrum of D-penicillamine displayed various characteristic peaks corresponding to the different stretching and bending modes of the bonds. For example, the peaks at 1464 and 1380 cm−1 could be attributed to the scissoring vibrations of methyl (–CH3) groups, while the peaks at 1096 and 1052 cm−1 could be assigned to the stretching vibrations of C–N and C–O, respectively. Several of these vibrational modes were also observed in the spectrum of Ag NCs. However, the peaks of the scissoring vibrations of –CH3 groups in the Ag NCs red-shifted when the staple motifs were formed, suggesting that the –CH3 groups of the ligand were located close to the core of the NCs. Some broadening (e.g., 1456 and 1346 cm−1) and merging (e.g., 1626 and 1118 cm−1) of peaks caused by metal–ligand interactions and electron transfer were also observed. Most importantly, the absence of S–H stretching at 2507 cm−1 in the spectrum of the Ag NCs indicated the binding of −SH to the Ag core, which is consistent with previously reported results for Ag NC formation.

    Figure  3.  (a) 1H-NMR spectra of the Ag NCs and D-penicillamine (D-pen) in D2O solution. The inset displays the chemical structure of D-penicillamine. Number 1 represents –CH group and number 2 (2’) denotes –CH3 group. (b) FTIR spectra of the Ag NCs and D-penicillamine. The dotted rectangle shows the position of the S–H vibrational frequency peak.

    XPS was utilized to study the chemical composition and valence states of the Ag NCs (Fig. 4). The XPS survey spectrum obtained suggested the presence of C, S, O, N, and Ag elements. The peak of S 2p3/2 appearing at 161.8 eV was assigned to S in the form of thiolate because this peak is located close to the reported value of metal sulfides. Ag may be expected in the forms of Ag+ and Ag0 because the binding energy of Ag 3d5/2 (368.2 eV) is between those of Ag+ and bulk Ag0.

    Figure  4.  XPS (a) survey, (b) Ag 3d, and (c) S 2p spectra of the Ag NCs.

    4-Aminophenol (4-AP) is a useful and important chemical with extensive applications as an inhibitor, painkiller, febrifuge, anticorrosion lubricant, and eikonogen [4446]. Noble metal nanoparticles have been intensively investigated as catalysts for the efficient production of 4-AP using 4-NP as the reactant and NaBH4 as the reducing agent. Therefore, the conversion of 4-NP to 4-AP in the presence of an excess amount of NaBH4 was exploited in this work as a model reaction to evaluate the catalytic activities of the as-synthesized Ag NCs quantitatively. A yellow solution was immediately formed when NaBH4 was added to the 4-NP solution. According to previous reports [47], the generation of 4-nitrophenolate ions under alkaline condition may be manifested by a strong absorption peak at 400 nm. The Ag NCs displayed catalytic activity for the reduction of 4-NP (Fig. 5(a)). However, aggregation of Ag NCs was observed during the reduction process. As seen in the inset in Fig. 5(a), the color of the Ag NC aqueous solution changed from dark green to dark brown after the introduction of NaBH4 and a precipitate was obtained after centrifugation. This finding reveals the instability of Ag NCs under the reduction conditions employed. Subsequently, the Ag NCs were absorbed on the surface of AC to form Ag NCs/AC composites and enhance the stability of the catalyst. The TEM, high-angle annular dark field, and elemental mapping images show that the Ag NCs are dispersed uniformly on the AC (Figs. 6(a)–6(d) and 6(g)–6(l)). The sizes of the AC spheres and Ag NCs were approximately 50 and 2 nm respectively. In the control experiment, the intensity of the absorption peak at 400 nm was nearly invariant in the absence of Ag NCs when AC was added to the solution of 4-nitrophenolate ions (Fig. 5(b)). This result indicates that AC exhibits no catalytic activity for the reduction of 4-NP. However, the absorption intensity of 4-nitrophenolate ions at 400 nm decreased quickly with time after the introduction of Ag NCs/AC (Fig. 5(c)). Two new peaks also appeared at 230 and 300 nm, thus suggesting the successful conversion of 4-NP to 4-AP. The peak at 400 nm nearly completely disappeared after 18 min, and the color of the solution changed from yellow to colorless. Therefore, Ag NCs/AC show excellent catalytic activity for the reduction of 4-NP to 4-AP.

    Figure  5.  UV–Vis absorption spectra of the reduction of 4-nitrophenol (4-NP) by (a) Ag NCs, (b) AC, and (c) Ag NCs/AC. The insets in (a) show photographs of the Ag NCs aqueous solution (1) before and (2) after addition of NaBH4 and (3) the solution in inset (2) after centrifugation. (d) Plot of the logarithm of Ct/C0 vs. reduction time, where Ct is the concentration of 4-NP during the reduction process, and C0 is the initial concentration of 4-NP before reduction. (e) Proposed mechanism of the hydrogenation of 4-NP catalyzed by Ag NCs/AC. (f) Recyclability of Ag NCs/AC for the reduction of 4-NP.
    Figure  6.  (a, b, c, d) TEM micrographs of the Ag NCs/AC recorded at different magnifications. (e, f) TEM micrographs of Ag NCs/AC after six cycles of catalytic reaction. (g) High-angle annular dark field images of the Ag NCs/AC. Elemental mappings of (h) Ag, (i) S, (j) C, (k) N, and (l) O in Ag NCs/AC.

    According to previous reports [48], the concentration of borohydride anion remains nearly constant during the reaction process owing to the large excess of NaBH4 compared with 4-NP. Thus, the catalytic process could be regarded as a pseudo-first order reaction according to the kinetic equation of ln(Ct/C0) = −kt. Herein, C0 is the initial concentration of 4-NP before the reduction and Ct is the instantaneous concentration of 4-NP throughout the reaction. Ct/C0 was calculated from the relative intensity of absorbance (At/A0) at 400 nm, and ln(Ct/C0) versus time could be estimated on the basis of changes in absorbance with respect to time. As shown in Fig. 5(d), a good linear relationship between ln(Ct/C0) and t was observed, thereby indicating that the reduction reaction follows pseudo-first-order kinetics. The kinetic reaction rate constant k of the Ag NCs/AC was obtained from the slope of the linear relationship and found to be 0.21 min−1. This k value is larger than those of several previously reported catalysts (Table 1) and may be explained in view of four aspects. First, the ultra-small sizes of Ag NCs with high percentage of surface atoms are the main active sites of the catalyst and display excellent catalytic activity. Second, the molecular properties of Ag NCs possessing a homogeneous surface chemical environment favor absorption of the substrate molecules. Third, the D-penicillamine ligand possesses the properties of water solubility and small size. Ag NCs protected by D-penicillamine have good affinity to 4-NP molecules and low coverage of active sites. Finally, the uniform and stable dispersion of Ag NCs on the AC improves the availability and recyclability of the catalyst. A possible mechanism based on the above results is proposed for the hydrogenation of 4-NP, as shown in Fig. 5(e). First, NaBH4 is decomposed by hydrolysis, and active hydrogen is formed. This hydrogen is then adsorbed on the active sites of Ag NCs. 4-nitrophenolate ions react with active hydrogen to give 4-hydroxylaminophenolate ions, which could further react with hydrogen to generate 4-AP. The activity of the catalyst remained nearly unchanged after six recycles (Fig. 5(f)). TEM images of the Ag NCs/AC after six recycles were obtained, and the sizes of the reused Ag NCs were comparable with that of the as-synthesized Ag NCs (Figs. 6(e) and 6(f)). These results reflect the excellent stability of the catalyst.

    Table  1.  Comparison of various reported catalysts for 4-nitrophenol reduction
    CatalystRate constants /
    min−1
    Initial concentration
    of 4-NP / mM
    Amount of catalysts /
    (mg∙mL−1)
    Temperature /
    °C
    Ref.
    Pt–Au ANCs0.0800.010.0425[49]
    Ni96Pt4 nanoparticles0.1160.0850.0017430[50]
    Cat3Au10.014763~0.33325[51]
    p(AAm)-CB-Ag0.037150.0192430[52]
    Spongy Au0.1260.103225[53]
    Au@Ag nanorods0.02740.18[54]
    Dendritic Pt~0.0450.1[48]
    AC/Ag NCs0.213.50.01325This work
    下载: 导出CSV 
    | 显示表格

    A one-pot and kinetically controlled strategy was employed to synthesize water-soluble and atomically precise Ag NCs. The Ag NCs were characterized to be Ag49(D-pen)24 by MALDI-TOF MS and TG analyses. The CH3 groups of the ligand were located close to the core of the NCs when the staple motifs were formed. The Ag NCs were supported on AC to form Ag NCs/AC, which showed excellent activity and stability for the catalytic reduction of 4-NP to 4-AP with a kinetic rate constant k of 0.21 min−1. This k value is even higher than those of some previously reported catalysts. The atomically precise Ag NCs developed in the present work provide a well-defined model for the investigation and application of Ag NCs. For example, the excellent catalytic properties of Ag NCs offer a prerequisite for discussion on the catalytic mechanism.

    This work was financially supported by the Huaibei Normal University Doctoral Research Start-up Funding (No. 15601012), the Natural Science Foundation of Anhui Provincial Department of Education (No. KJ2019A0598), the Excellent Young Talents Fund Program of Higher Education Institutions of Anhui Province, China (No. gxyq2019168), and the Team of Superior Discipline of Chemistry (No. GFXK202108).

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