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Andries Mthisi, Nicholus Malatji, A. Patricia, I. Popoola, and L. Rudolf Kanyane, Parametric study of spark plasma sintering of Al20Cr20Fe25Ni25Mn10 high entropy alloy with improved microhardness and corrosion, Int. J. Miner. Metall. Mater., 29(2022), No. 1, pp. 119-127. https://doi.org/10.1007/s12613-020-2200-3
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Andries Mthisi E-mail: Andriesmthisi@gmail.com
采用放电等离子烧结(SPS)技术在不同温度（800、900和200°C）下保温不同时间（4、8和12 min）合成了Al20Cr20Fe25Ni25Mn10高熵合金（HEA）。通过扫描电子显微镜、能谱仪（EDS）、维氏显微硬度计、极化曲线等对合金的微观结构、显微硬度和腐蚀进行了实验研究。X-射线衍射（XRD）表征了所制备合金的成分。EDS结果显示不论烧结参数如何变化，合金均由原始合金元素组成。XRD、EDS和扫描电子显微镜的结果说明所制备的合金具有球形微观结构，呈现出面心立方结构相，这是基于固溶机制形成的。这表明SPS合金具有HEAs的特征。在1000°C保温 12 min生产的合金显微硬度最高，为HV 447.97，热处理后其硬度降至HV 329.47。同一合金表现出优异的耐腐蚀性能。烧结温度升高，Al20Cr20Fe25Ni25Mn10合金可具有更高的密度、显微硬度和耐腐蚀性。
Multicomponent Al20Cr20Fe25Ni25Mn10 alloys were synthesized using spark plasma sintering at different temperatures (800, 900, and 1000°C) and holding times (4, 8, and 12 min) to develop a high entropy alloy (HEA). The characteristics of spark plasma-synthesized (SPSed) alloys were experimentally explored through investigation of microstructures, microhardness, and corrosion using scanning electron microscopy coupled with energy dispersive spectroscopy (EDS), Vickers microhardness tester, and potentiodynamic polarization, respectively. X-ray diffraction (XRD) characterization was employed to identify the phases formed on the developed alloys. The EDS results revealed that the alloys consisted of elements selected in this work irrespective of varying sintering parameters. The XRD, EDS, and scanning electron microscopy collectively provided evidence that the fabricated alloys were characterized by globular microstructures exhibiting face-centered cubic phase, which was formed on a basis of solid solution mechanism. This finding implies that the SPSed alloy showed the features of HEAs. The alloy produced at 1000°C and holding time of 12 min portrayed an optimal microhardness of HV 447.97, but the value decreased to HV 329.47 after heat treatment. The same alloy showed an outstanding corrosion resistance performance. The increase in temperature resulted in an Al20Cr20Fe25Ni25Mn10 alloy with superior density, microhardness, and corrosion resistance over the other alloys developed at different parameters.
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