Microstructural evolution and mechanical properties of Ni-45Ti-5Al-2Nb-1Mo alloy subjected to different heat treatments  

作　　者：Xiao-Yun Song Yan Li Fei Zhang 

机构地区：[1]State Key Laboratory of Nonferrous Metals and Processes,GRIMAT Engineering Institute Co.Ltd,Beijing 101407,China [2]School of Materials Science and Engineering,Beihang University,Beijing 100191,China

出　　处：《Rare Metals》2023年第8期2774-2780,共7页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51571036 and 51201016)。

摘　　要：The effects of solution and aging heat treatment on microstructural evolution and room temperature tensile properties for as-forged Ni-45Ti-5Al-2Nb-1Mo alloy were investigated through scanning electron microscopy(SEM),transmission electron microscopy(TEM)and tensile tests.The results show that the microstructure of solution-treated alloy comprises NiTi matrix,Ti_(2)Ni and(Nb,Ti)ss phases.After aging treatment at 700℃for 6 and100 h,the distribution of Ti_(2)Ni and(Nb,Ti)ss precipitates increases in uniformity.No new type of precipitate is observed in the specimen aged at 700℃.After aging at800℃for 100 h,numerous nanosized Ni_(2)TiAl phases are precipitated within the grains.Solution and aging treatments improve the tensile properties at room temperature.Tensile strength and ductility are improved after solution treatment at 1100℃plus aging treatment at 800℃for 6 h or 700℃for 100 h.With aging time prolonging to 100 h at 800℃,the precipitation of fine Ni2TiAl particles leads to the improvement in tensile strength and deterioration of elongation.

关 键 词：NiTi-Al-based alloy INTERMETALLICS Microstructure Mechanical properties Heat treatment 

分 类 号：TG156[金属学及工艺—热处理] TG146.15[金属学及工艺—金属学]