α_(2) phase precipitation behavior and tensile properties at room temperature and 650℃ in an(α+β) titanium alloy  

作　　者：Wen-Jing Zhang Xiao-Yun Song Song-Xiao Hui Wen-Jun Ye Yang Yu Yan-Feng Li 

机构地区：[1]State Key Laboratory of Nonferrous Metals and Processes,GRIMAT Engineering Institute Co.,Ltd.,Beijing 100088,China

出　　处：《Rare Metals》2021年第11期3261-3268,共8页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No.51801177)。

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 influence the precipitation behavior of α_(2) phase,and the size ofα_(2) phase affects the tensile properties.The growth speed ofα_(2) phase gets quicker with the aging temperature increasing under the same aging time.For a given aging temperature,the size of α_(2) 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 α_(2) phase increasing.It is found that α_(2) phase,less than 7 nm,does not impair the roomtemperature ductility.However,when the size of α_(2) 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.

关 键 词：Aging treatment α_(2)phase Tensile properties Interaction mechanism 

分 类 号：TG146.23[一般工业技术—材料科学与工程]