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CoFeNi系高熵合金机械合金化过程的研究
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Abstract:
为了研究CoFeNi系高熵合金的机械合金化过程，采用300 r/min，40 h的机械球磨法(MA)+1000℃的热压等离子烧结工艺(SPS)制备了CoFeNi、CoFeNiAl0.5和CoFeNiAl0.5Cr0.5高熵合金粉体和块体。通过X衍射分析仪(XRD)、扫描电子显微镜(SEM)等测试手段，研究CoFeNi系合金物相和显微组织。球磨40 h后CoFeNi合金为FCC相，CoFeNiAl0.5和CoFeNiAl0.5Cr0.5为FCC + 少量BCC相。SPS烧结后，CoFeNi合金仍然为FCC相，而CoFeNiAl0.5和CoFeNiAl0.5Cr0.5合金中部分FCC相转变为BCC相，合金中BCC相含量高于粉体合金。
In order to study the mechanical alloying process of CoFeNi system high entropy alloys, CoFeNi, CoFeNiAl0.5 and CoFeNiAl0.5Cr0.5 high entropy alloy powders and lumps were prepared by mechanical ball milling (MA) + hot press plasma sintering (SPS) process at 300 r/min for 40 h. The alloy powders and lumps were prepared by X diffraction analyzer (XRD) and scanning electron microscope (SEM). The physical phase and microstructure of CoFeNi alloys were investigated by X diffraction analyzer (XRD), scanning electron microscope (SEM) and other testing methods. The CoFeNi alloy was in FCC phase after ball milling for 40 h, and the CoFeNiAl0.5 and CoFeNiAl0.5Cr0.5 were in FCC + few BCC phase. After SPS sintering, the CoFeNi alloy was still in FCC phase, and some of the FCC phases in CoFeNiAl0.5 and CoFeNiAl0.5Cr0.5 alloys were transformed into BCC phase. The content of BCC phase in the alloys is higher than that in the powder alloys.
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