摘要
采用真空电弧熔炼制备AlCrNiTiSix(x=0,0.2,0.4,0.6,0.8,1)高熵合金纽扣锭,并使用试验和数值模拟相结合的方法分析其微观组织。结果表明,AlCrNiTiSix高熵合金为典型的树枝晶结构,且AlCrNiTi合金枝晶区由FCC结构的AlNi2Ti相和富Cr的Laves相组成,枝晶间区为4种元素的固溶相。Si含量的增加对枝晶区的影响最为明显,随着Si含量的增加,枝晶区的AlNi2Ti相向AlNi相转变,富Cr的Laves相向(Cr,Ti)5Si3相转变。枝晶间区域以多种元素的固溶体为主。由于Si元素加入产生了固溶强化并且Laves相被硬度更高的(Cr,Ti)5Si3相取代,因此,合金的硬度随着Si元素添加而增加。在AlCrNiTi合金中模拟的γ相和BCC相在试验结果中没有出现,其他的试验结果与模拟结果基本符合。
The ingots of AlCrNiTiSix(x=0,0.2,0.4,0.6,0.8,1)high-entropy alloys were fabricated by vacuum arc melting.The microstructure was analyzed through a combination of experiments and numerical simulations.The results reveal that AlCrNiTiSixhigh entropy alloys present all typical of dendritic structures,and the dendrite region is composed of FCC-structured AlNi2Ti phase and Cr-rich Laves phase,while the interdendritic region consists of a solid solution phase of four elements.The increase of Si content has significant effect on the dendrite region,which results in the transformations from the AlNi2Ti phase to the AlNi phase,and the Cr-rich Laves phase to(Cr,Ti)5Si3phase.The interdendritic region is dominated by solid solutions of multiple elements.In addition,the hardness is increased with the addition of Si elements,which is attributed to the solid solution strengthening and the replacement of Laves phase by higher hardness(Cr,Ti)5Si3phase.The experimental results were basically consistent with the simulated ones,Theγphase and BCC phase predicted by the simulation didn’t appear in the experimental ones.
作者
叶喜葱
徐张洋
王童
徐东
张文
方东
Ye Xicong;Xu Zhangyang;Wang Tong;Xu Dong;Zhang Wen;Fang Dong(Hubei Key Laboratory of Hydro-mechanical Equipment and Maintenance,China Three Gorges Univesity;College of Mechanical and Power Engineering,China Three Gorges Univesity)
出处
《特种铸造及有色合金》
CAS
北大核心
2020年第12期1323-1327,共5页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(51604161)
水电机械设备设计与维护湖北省重点实验室(三峡大学)开放基金资助项目(2019KJX10)
2020年三峡大学硕士学位论文培优基金资助项目(2020SSPY041)。
关键词
高熵合金
微观组织
硬度
模拟分析
High Entropy Alloys
Microstructure
Hardness
Simulation Analysis
