摘要
为了阐明具有双态和单相组织Ti-5Al-5Mo-1Fe-1Cr(质量分数,%)合金的力学性能及变形行为,系统研究具有这两种组织合金的力学性能和变形模式。研究结果表明:双态组织合金的拉伸屈服强度为886 MPa,极限抗拉强度为1075 MPa,伸长率为21.5%;单相(β)组织合金的强度稍低于双态合金的,但其伸长率与双态合金的类似。双态合金在拉伸过程中具有韧性断裂的特征,其主要变形模式为位错滑移,位错滑移可发生于β基体和球/片状α相,β基体中的滑移系为{112}_(β)<111>_(β),α相中的滑移系为{2233}_(α)<1123>_(α)和{1010}_(α)<1210>_(α)。相对地,单相合金具有解理断裂特征,变形模式包括位错滑移和应力诱导α"马氏体相变,其滑移系包括{110}_(β)<111>_(β)和{112}_(β)<111>_(β)。
To clarify the differences of mechanical properties and deformation behaviors of a Ti−5Al−5Mo−1Fe−1Cr(wt.%)alloy with duplex and single-phase microstructures,the tensile properties and deformation modes of the alloy with these two different microstructures were studied systematically.The results show that the sample with the duplex microstructure has a tensile yield strength of 886 MPa,an ultimate tensile strength of 1075 MPa and an elongation of 21.5%.The sample with the singleβphase has a relatively lower strength and α similar elongation.The sample with the duplex microstructure has a ductile fracture mode and deforms via dislocation slipping in theβmatrix and spherical or plate-like α phases.The slip systems are {112}_(β)<111>_(β) in β matrix,and {2233}_(α)<1123>_(α) and {1010}_(α)<1210>_(α) inαphase.In contrast,the single-phase sample has a quasi-cleavage fracture mode and deforms via dislocation slipping and stress-inducedα″martensite transformation,and the slip systems are {110}_(β)<111>_(β) and {112}_(β)<111>_(β).
作者
刘超强
谢宗瑜
张晓泳
严红革
周科朝
宋旼
Chao-qiang LIU;Zong-yu XIE;Xiao-yong ZHANG;Hong-ge YAN;Ke-chao ZHOU;Min SONG(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;College of Materials Science and Engineering,Hunan University,Changsha 410082,China)
基金
the National Natural Science Foundation of China(No.51828102).
关键词
近Β钛合金
力学性能
变形行为
位错滑移
应力诱导马氏体相变
nearβ-Ti alloys
mechanical properties
deformation behavior
dislocation slipping
stress-induced martensite transformation
