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Phase Evolution and Mechanical Properties of AlCoCrFeNiSi (x) High-Entropy Alloys Synthesized by Mechanical Alloying and Spark Plasma Sintering

机译:通过机械合金化和火花等离子体烧结合成的AlcocroCenisi(X)高熵合金的相位演化与机械性能

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摘要

In the current investigation, AlCoCrFeNiSi (x) (x = 0, 0.3, 0.6 and 0.9 in atomic ratio) high-entropy alloy systems are prepared by mechanical alloying and subsequently consolidated by spark plasma sintering. The microstructural and mechanical properties were analyzed to understand the effect of Si addition in AlCoCrFeNi alloy. The x-ray diffraction analysis reveals the supersaturated solid solution of the body-centered cubic structure after 20 h of ball milling. However, the consolidation promotes the transformation of body-centered phases partially into the face-centered cubic structure and sigma phases. A recently proposed geometric model based on the atomic stress theory has been extended for the first time to classify single phase and multi-phases on the high-entropy alloys prepared by mechanical alloying and spark plasma sintering process. Improved microhardness and better wear resistance were achieved as the Si content increased from 0 to 0.9 in the present high-entropy alloy.
机译:在本电流研究中,通过机械合金化制备高熵合金系统的AlcoCroCenisi(x)(x = 0,0.3,0.6和0.9,随后通过火花等离子体烧结固结。 分析了微观结构和机械性能,以了解Si加入在阿尔科群合金中的作用。 X射线衍射分析显示在球磨20小时后的体为立方结构的超饱和固溶体。 然而,固结促进身体中心相的转化部分以面为中心的立方体结构和Σ相。 最近提出了基于原子应力理论的几何模型,首次延长了通过机械合金化和火花等离子体烧结过程制备的高熵合金上的单相和多相。 随着Si含量从本高熵合金中的0至0.9增加,实现了改善的微硬度和更好的耐磨性。

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