时效处理对Cu_xCrFeNiAl高熵合金组织与硬度的影响  

Effects of Aging Treatment on Microstructure and Mechanical Properties of Cu_xCrFeNiAl High-entropy Alloys

作　　者：张国玺 任波[2,3] 赵瑞锋[2] 关绍康[3] 滕瑛瑶[2] 

机构地区：[1]郑州幼儿师范高等专科学校 [2]河南工程学院机械工程学院 [3]郑州大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2015年第4期440-443,共4页Special Casting & Nonferrous Alloys

基　　金：中国博士后基金面上项目(2013M541986)

摘　　要：采用非自耗真空电弧熔炼炉制备了CuxCrFeNiAl(x=0、0.2、0.5、1.0、2.0)高熵合金,时效工艺为600℃×12h。采用X射线衍射仪(XRD)、扫描电镜(SEM)和数显硬度仪对高熵合金的微观组织和硬度进行了分析。结果表明,Cu含量较低时(x≤0.5),CuxCrFeNiAl的组织主要由BCC相、FCC相和α-NiAl相组成;Cu含量较高时(x≥1.0),CuxCrFeNiAl的组织主要由含Cr、Fe、Ni的FCC1相、含Cu、Ni的FCC2相和α-NiAl相组成。硬度测试表明,含有BCC相的CrFeNiAl合金硬度(HV)最高,约为641,而由FCC相组成的Cu2CrFeNiAl合金的硬度(HV)最低,约为375。时效处理后合金的物相未发生明显改变,但合金组织更加均匀,并在枝晶间区域有纳米颗粒析出,因而合金硬度与铸态相比略有提高。The CuxCrFeNiAl（x =0、0.2、0.5、1.0、2.0）high entropy alloys were prepared by arc melting process.The microstructure and hardness of the alloys at as-cast and aging treatment condition（at 600℃for 12h）were characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）and digital display Vickers hardness tester.The results show that the alloys are composed of a mixed structure of BCC,FCC,andα-NiAl phases at low Cu contents（x≤0.5）.With Cu content more than 1.0,the alloys are composed of FCC1phase（in rich Cr-Fe-Ni）,FCC2（in rich Cu-Ni）andα-NiAl phases.The CrFeNiAl alloy with BCC phase has the highest hardness of 641 HV,whereas the Cu2 CrFeNiAl alloy with FCC phase has the lowest hardness of 375 HV.After aging treatment,the phase change of the alloys is absent,however,its microstructure is more uniform,and there are some precipitates of nano-particles in interdendrite regions.Thus the hardness of aged alloys is higher than that of as-cast alloys.

关 键 词：高熵合金 时效处理 微观组织 硬度 

分 类 号：TG146.11[一般工业技术—材料科学与工程] TG139[金属学及工艺—金属材料]