In situ (α-Al2O3+ZrB2)/Al composites with network distribution fabricated by reaction hot pressing

El Oualid Mokhnache, Gui-song Wang, Lin Geng, Kaveendran Balasubramaniam, Abdelkhalek Henniche, Noureddine Ramdani

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    Cite this article as:

    El Oualid Mokhnache, Gui-song Wang, Lin Geng, Kaveendran Balasubramaniam, Abdelkhalek Henniche, and Noureddine Ramdani, In situ (α-Al2O3+ZrB2)/Al composites with network distribution fabricated by reaction hot pressing, Int. J. Miner. Metall. Mater., 22(2015), No. 10, pp.1092-1100. https://dx.doi.org/10.1007/s12613-015-1172-1
    El Oualid Mokhnache, Gui-song Wang, Lin Geng, Kaveendran Balasubramaniam, Abdelkhalek Henniche, and Noureddine Ramdani, In situ (α-Al2O3+ZrB2)/Al composites with network distribution fabricated by reaction hot pressing, Int. J. Miner. Metall. Mater., 22(2015), No. 10, pp.1092-1100. https://dx.doi.org/10.1007/s12613-015-1172-1
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    In situ (α-Al2O3+ZrB2)/Al composites with network distribution fabricated by reaction hot pressing

    • School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

    • Polymer Materials Research Center, Harbin Engineering University, Harbin, 150001, China

    基金项目: 

    This work was financially supported by the National Natural Science Foundation of China (No. 51201047), the Major State Basic Research Development Program of China (No. 2012CB619600), the China Postdoctoral Science Foundation (No. 20110491038), and the Fundamental Research Funds for the Central Universities of China (No. HIT.NSRIF.2013001).

      通信作者:

      Gui-song Wang E-mail: wangguisong@hit.edu.cn

    中文摘要

    In situ (α-Al2O3+ZrB2)/Al composites with network distribution were fabricated using low-energy ball milling and reaction hot pressing. Differential thermal analysis (DTA) was used to study the reaction mechanisms in the Al–ZrO2–B system. X-ray diffraction (XRD) and scanning electron microscopy (SEM) in conjunction with energy-dispersive X-ray spectroscopy (EDX) were used to investigate the composite phases, morphology, and microstructure of the composites. The effect of matrix network size on the microstructure and mechanical properties was investigated. The results show that the optimum sintering parameters to complete reactions in the Al–ZrO2–B system are 850℃ and 60 min. In situ-synthesized α-Al2O3 and ZrB2 particles are dispersed uniformly around Al particles, forming a network microstructure; the diameters of the α-Al2O3 and ZrB2 particles are approximately 1–3 μm. When the size of Al powder increases from 60–110 μm to 150–300 μm, the overall surface contact between Al powders and reactants decreases, thereby increasing the local volume fraction of reinforcements from 12% to 21%. This increase of the local volume leads to a significant increase in microhardness of the in situ (α-Al2O3–ZrB2)/Al composites from Hv 163 to Hv 251.

     

    In situ (α-Al2O3+ZrB2)/Al composites with network distribution fabricated by reaction hot pressing

    Author Affilications

      • School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

      • Polymer Materials Research Center, Harbin Engineering University, Harbin, 150001, China

    • Funds: 

      This work was financially supported by the National Natural Science Foundation of China (No. 51201047), the Major State Basic Research Development Program of China (No. 2012CB619600), the China Postdoctoral Science Foundation (No. 20110491038), and the Fundamental Research Funds for the Central Universities of China (No. HIT.NSRIF.2013001).

    • Received: 21 February 2015; Revised: 22 March 2015; Accepted: 26 March 2015;
    In situ (α-Al2O3+ZrB2)/Al composites with network distribution were fabricated using low-energy ball milling and reaction hot pressing. Differential thermal analysis (DTA) was used to study the reaction mechanisms in the Al–ZrO2–B system. X-ray diffraction (XRD) and scanning electron microscopy (SEM) in conjunction with energy-dispersive X-ray spectroscopy (EDX) were used to investigate the composite phases, morphology, and microstructure of the composites. The effect of matrix network size on the microstructure and mechanical properties was investigated. The results show that the optimum sintering parameters to complete reactions in the Al–ZrO2–B system are 850℃ and 60 min. In situ-synthesized α-Al2O3 and ZrB2 particles are dispersed uniformly around Al particles, forming a network microstructure; the diameters of the α-Al2O3 and ZrB2 particles are approximately 1–3 μm. When the size of Al powder increases from 60–110 μm to 150–300 μm, the overall surface contact between Al powders and reactants decreases, thereby increasing the local volume fraction of reinforcements from 12% to 21%. This increase of the local volume leads to a significant increase in microhardness of the in situ (α-Al2O3–ZrB2)/Al composites from Hv 163 to Hv 251.

     

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