Fe_(40)Cr_(25)Ni_(25)Al_(5)Ti_(5)中熵合金的微观组织和力学性能  

Microstructure and mechanical properties of Fe_(40)Cr_(25)Ni_(25)Al_(5)Ti_(5)medium entropy alloy

作　　者：胡朝辉 娄照坤 王鑫 张利 赵元 余建新[2] 张璐 HU Zhaohui;LOU Zhaokun;WANG Xin;ZHANG Li;ZHAO Yuan;YU Jianxin;ZHANG Lu(School of Materials Science and Engineering,Shenyang Aerospace University,Shenyang 110136,China;Center of Analysis,Measurement and Computing,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]沈阳航空航天大学材料科学与工程学院,沈阳110136 [2]哈尔滨工业大学分析测试与计算中心,哈尔滨150001

出　　处：《材料工程》2023年第6期93-100,共8页Journal of Materials Engineering

基　　金：沈阳航空航天大学博士科研启动基金项目(19YB42);沈阳航空航天大学创新创业训练计划项目(202110143012)。

摘　　要：采用真空电弧熔炼炉制备Fe_(40)Cr_(25)Ni_(25)Al_(5)Ti_(5)(原子分数/%)中熵合金,利用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)、透射电镜(TEM)及拉伸试验机研究合金固溶态和退火态的微观组织、力学性能、强化机制及变形机制。结果表明:Fe_(40)Cr_(25)Ni_(25)Al_(5)Ti_(5)中熵合金固溶态为FCC+BCC1+BCC2三相固溶体组织,屈服强度为520 MPa,断裂强度为852 MPa,伸长率为13%。经600℃退火2 h,合金相组成未改变,颗粒状BCC2相尺寸增大,FCC区与BCC区体积分数无明显变化,屈服强度为668 MPa,断裂强度达1029 MPa,伸长率降低至9%。Fe_(40)Cr_(25)Ni_(25)Al_(5)Ti_(5)合金的强度源于共格应变强化、固溶强化及界面强化的协同作用,位错滑移为合金主要的变形机制。Fe_(40)Cr_(25)Ni_(25)Al_(5)Ti_(5)(atom fraction/%)medium entropy alloys(MEAs)were prepared by a vacuum arc-melting furnace with a water-cooled copper mold,and the microstructure,mechanical properties and strengthening deformation mechanism of the alloy in solid solution and annealed states were studied by scanning electron microscopy(SEM),energy spectrometry(EDS),X-ray diffractometer(XRD),transmission electron microscopy(TEM)and tensile testing machine.The results show that the Fe_(40)Cr_(25)Ni_(25)Al_(5)Ti_(5)medium entropy alloy has FCC+BCC1+BCC2 triple-phase organization of solid solution state,with yield strength of 520 MPa,fracture strength of 852 MPa and elongation of 13%.After annealing at 600℃for 2 h,the phase composition of the alloy has no change,the size of granular BCC2 phase increases,and the volume fraction of FCC zone and BCC zone has no change significantly.The yield strength is 668 MPa,the fracture strength is 1029 MPa,and the elongation is reduced to 9%.The strength of Fe_(40)Cr_(25)Ni_(25)Al_(5)Ti_(5)alloy originates from the synergistic effect of coherent strengthening,solid solution strengthening and phase boundary strengthening.Dislocation slips are the main deformation mechanism of alloy.

关 键 词：中熵合金 力学性能 强化机制 变形机制 

分 类 号：TG113[金属学及工艺—物理冶金]