【摘 要】
：
The microstructure,room temperature and 650℃tensile properties of an(α+β)titanium alloy were investigated after aging over a temperature range of 600-750℃following solution treatment.The results exhibit that both aging temperature and aging time influ-enc
【机 构】
：
State Key Laboratory of Nonferrous Metals and Processes,GRIMAT Engineering Institute Co.,Ltd.,Beijin
论文部分内容阅读
The microstructure,room temperature and 650℃tensile properties of an(α+β)titanium alloy were investigated after aging over a temperature range of 600-750℃following solution treatment.The results exhibit that both aging temperature and aging time influ-ence the precipitation behavior of α2 phase,and the size ofα2 phase affects the tensile properties.The growth speed ofα2 phase gets quicker with the aging temperature increas-ing under the same aging time.For a given aging tem-perature,the size of α2 phase gets larger when prolonging the aging time.There are significant improvements in yield and ultimate tensile strength at room temperature and 650℃after aging at 600℃for 2 h,but these values decrease with the size of α2 phase increasing.It is found that α2 phase,less than 7 nm,does not impair the room-temperature ductility.However,when the size of α2 phase grows up from 7 to 15 nm,ductility decreases drastically.During 650℃tensile process,with the particle size increasing from 3 to 15 nm,the interaction between moving dislocations and coherent particles changes from cutting mechanism to bypass mechanism.
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