摘要
采用非自耗真空电弧炉熔炼制备了AlxCrCuNiTi(x=0.2、0.4、0.6、1.0)高熵合金,利用X射线衍射仪(XRD)、扫描电镜(SEM)、能谱分析(EDS)和显微硬度计对合金的微观组织和硬度进行了分析。结果表明,AlxCrCuNiTi合金主要由BCC1、BCC2和FCC固溶体相组成,随Al含量增加,合金中FCC相的相对含量减少而BCC相的相对含量增加,表明Al元素有利于BCC相的形成。合金微观组织主要呈树枝晶和枝晶间结构,随着Al含量增加,AlxCrCuNiTi合金中的枝晶区域缩小而枝晶间区域扩大,Al、Cr、Ti偏析于枝晶区而Cu、Ni偏析于枝晶间区域。随Al含量的提高,AlxCrCuNiTi合金的硬度(HV)从376增加至513。
AlxCrCuNiTi(x=0.2,0.4,0.6,1.0)high entropy alloys were prepared by arc melting process.The microstructure and hardness of the alloys prepared were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM)and digital display Vickers hardness tester.The results reveal that the alloys are composed of a mixed structure of BCC1,BCC2 and FCC phases.With the increase of Al content,the FCC phase is decreased and the BCC phase is increased,which indicate that the Al element is in favor of the formation of BCC phase.The microstructure of the alloys presents a structure of dendrite and interdendrite.With the increase of Al element,the dendrite region is reduced while the interdendrite region is expanded in the AlxCrCuNiTi high entropy alloys.In addition,Al,Cr and Ti are segregated in the dendrite region,while Cu and Ni are segregated in the interdendrite region.The hardness of the AlxCrCuNiTi alloys is increased to 513 HV from 376 HV as the increase of Al content.
作者
郭富强
Guo Fuqiang(Zhengzhou University of Industrial Technology)
出处
《特种铸造及有色合金》
CAS
北大核心
2019年第12期1277-1281,共5页
Special Casting & Nonferrous Alloys
基金
河南省高等学校优秀基层教学组织建设基金资助项目(教高[2017]730号)
郑州工业应用技术学院2018年度校级科研资助项目(2018YB015)
关键词
高熵合金
微观组织
硬度
High Entropy Alloy
Microstructure
Hardness
