摘要
铸态Ti-43Al-9V-0.3Y合金由γ相及少量α_2,B2和YAl_2相组成,为细小的近层片组织,晶粒(层片团)尺寸约为80μm,层片体积分数约为85%;锻态合金由大量细小的动态再结晶等轴γ晶粒组成,组织细化显著,γ再结晶晶粒尺寸约为1—5μm;轧态合金为细小近γ组织,γ晶粒尺寸约为20μm,尺寸细小的B2相呈网络状分布在γ晶粒周围.铸态合金在室温下的拉伸断裂强度约为510.6 MPa,延伸率约为0.5%;在700℃下的拉伸断裂强度约为425.8 MPa,延伸率约为5.7%.锻造和轧制后的Ti-43Al-9V-0.3Y合金的力学性能均得到了明显改善.
As-cast Ti-43Al-9V-0.3Y alloy comprises γ phase, minor α2, B2 and YAl2, and its microstructure is lamellar structure （lamellar volume fraction of about 85%, lamellar colony size of about 80 μm）. As-forged alloy comprises a large number of dynamicly recrystallized γ grains with sizes of 1--5 μm, and microstructure was drastically refined. As-rolled alloy consists of the fine near γ with size of about 20 μm and fine net-like B2 phases distributed along γ grains. The ultimate tensile strengths of about 510.6 and 425.8 MPa were obtained at room temperature and 700℃ for as-cast alloy with the elongations of about 0.5% and 5.7%, respectively. After forging and rolling, the tensile properties of the alloy were greatly improved.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第7期815-820,共6页
Acta Metallurgica Sinica
