AlCrCuFeNb_(x)NiTi高熵合金组织与性能研究  

Microstructure and Properties of AlCrCuFeNb_(x)NiTi High Entropy Alloys

作　　者：曾聪 何文[1,2] 梁炳亮 陈卫华[1] 欧阳晟[1,2] 艾云龙 张建军[1] Zeng Cong;He Wen;Liang Bingliang;Chen Weihua;Ouyang Sheng;Ai Yunlong;Zhang Jianjun(School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China;Analysis and Testing Center,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学材料科学与工程学院,江西南昌330063 [2]南昌航空大学分析测试中心,江西南昌330063

出　　处：《稀有金属材料与工程》2021年第11期4031-4036,共6页Rare Metal Materials and Engineering

基　　金：江西省自然科学基金面上项目(20202BAB204013);江西省研究生创新专项资金(YC2020-S529);博士启动基金项目(EA201901296)。

摘　　要：采用电弧熔炼制备了AlCrCuFeNb_(x)NiTi(x=0,0.25,0.5,1.0)高熵合金,研究不同Nb含量对AlCrCuFeNb_(x)NiTi高熵合金显微组织和力学性能的影响。结果表明:AlCrCuFeNb_(x)NiTi(x=0,0.25,0.5,1.0)高熵合金物相主要包含有序fcc的L2_(1)相和Laves相,还有少量的bcc(A2)和fcc相;Nb元素的添加能促进Laves相的生成且对Cu元素的偏析具有一定的抑制效果;通过相判据参数计算找到了适合AlCrCuFeNb_(x)NiTi高熵合金的相形成判据;添加适量的Nb元素能够改善AlCrCuFeNiTi六元高熵合金的力学性能;AlCrCuFeNb_(0.5)NiTi高熵合金具有较好的综合力学性能,抗压强度达到1587.4 MPa,硬度(HV)达到5688 MPa;Nb元素含量过高时会形成过多的Laves相使合金表现出过早脆化现象。AlCrCuFeNb_(x)NiTi(x=0,0.25,0.5,1.0)high-entropy alloys were prepared by arc melting,and the effect of different Nb contents on the microstructures and mechanical properties of AlCrCuFeNb_(x)NiTi high-entropy alloys was studied.The results show that the phase of AlCrCuFeNb_(x)NiTi(x=0,0.25,0.5,1.0)high-entropy alloys consists of ordered fcc L2_(1) phase and Laves phase,together with minor bcc(A2)and fcc phases.The addition of Nb element can promote the formation of Laves phase and has a certain inhibitory effect on the segregation of Cu elements.The phase formation criterion suitable for AlCrCuFeNb_(x)NiTi high-entropy alloys is found through the calculation of phase criterion parameters.The addition of an appropriate amount of Nb can improve the mechanical properties of AlCrCuFeNiTi six-element high-entropy alloy.AlCrCuFeNb_(0.5)NiTi high-entropy alloy has better comprehensive mechanical properties.The compressive strength reaches 1587.4 MPa,and the hardness(HV)reaches 5688 MPa.When the Nb element content is too high,too much Laves phase will be formed and the alloy will exhibit premature embrittlement.

关 键 词：高熵合金 金属间化合物 相组成 显微组织 力学性能 

分 类 号：TG139[一般工业技术—材料科学与工程]