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为了获得不同典型组织,对锻态Ti-45Al-9Nb-Y合金进行不同工艺的热处理。在1330℃锻态Ti-45Al-9Nb-Y合金进行高于锻造温度的热处理,等轴γ晶粒内析出魏氏α相。魏氏α相以Blackburn位向关系在γ相内形成,其出现有利于双态组织中片层晶团的形成,因此锻态Ti-45Al-9Nb-Y合金在1340℃保温10 min即可获得双态组织。在全层片组织的热处理中,魏氏α相基本消失,1410℃保温30 min可获得全层片组织。不同形态的组织力学性能测试表明:全层片组织的强度最高在800℃,可达710 MPa;双态组织在900℃的伸长率可达42%左右。
In order to obtain different typical organizations, the as-forged Ti-45Al-9Nb-Y alloy was heat-treated by different processes. The as-machined Ti-45Al-9Nb-Y alloy was heat treated at 1330 ℃ forging temperature, and the Wei’s α phase was precipitated in the equiaxed γ grains. Wei’s α phase is formed in the γ phase by the Blackburn orientation, which is favorable for the formation of lamellae in the dual-phase microstructure. Therefore, Ti-45Al-9Nb-Y alloy can be obtained by holding at 1340 ℃ for 10 min Bicomorphism. In the full-thickness tissue heat treatment, Wei’s α phase disappeared, 1410 ℃ insulation 30 min to obtain full-thickness tissue. The test of mechanical properties of different forms showed that the strength of the whole-layer structure was up to 800 ℃ and up to 710 MPa, while the elongation of bimodal structure was about 42% at 900 ℃.