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采用“机械合金化+SPS烧结”制备了CoFeNiAl0.6Ti0.4和CrCoFeNiAl0.6Ti0.4块体高熵合金,研究元素Cr对CoFeNiAl0.6Ti0.4高熵合金的合金化行为和组织的影响。结果表明:Cr元素并不影响CoFeNiAl0.6Ti0.4高熵合金的合金化顺序,而影响完全合金化后的晶体结构,使CoFeNiAl0.6Ti0.4高熵合金原本单一的fcc结构转变为fcc+bcc结构。SPS烧结后,CoFeNiAl0.6Ti0.4高熵合金主要为fcc+bcc主相+微量bcc白相,而Cr元素的添加促使合金转变成fcc主相+微量bcc白相。同时,合金元素Cr的加入,使CoFeNiAl0.6Ti0.4高熵合金中的微量白相,由原本富Al和Fe元素转变为富Al和Ti元素;且Cr元素不影响CoFeNiAl0.6Ti0.4高熵合金中fcc结构的纳米孪晶组织的形成。
The high entropy alloys of CoFeNiAl0.6Ti0.4 and CrCoFeNiAl0.6Ti0.4 were prepared by mechanical alloying + SPS sintering, and the effect of elemental Cr on the alloying behavior and microstructure of CoFeNiAl0.6Ti0.4 high-entropy alloys was studied. The results show that the Cr element does not affect the alloying sequence of CoFeNiAl0.6Ti0.4 high entropy alloy, but affects the fully alloying crystal structure, so that the original single fcc structure of CoFeNiAl0.6Ti0.4 high entropy alloy is transformed into fcc + bcc structure. After SPS sintering, the CoFeNiAl0.6Ti0.4 high-entropy alloy is mainly fcc + bcc main phase + trace bcc white phase, while the addition of Cr element causes the alloy to transform into fcc main phase + trace bcc white phase. At the same time, the addition of alloying element Cr makes the minor white phase in the high entropy alloy CoFeNiAl0.6Ti0.4 transformed from the original Al-rich and Fe-rich elements into Al and Ti-rich elements; and the Cr element does not affect the CoFeNiAl0.6Ti0.4 high-entropy alloy Formation of nanocrystals in fcc structure.