显微组织对TA15合金高温拉伸性能的影响  

Effect of Microstructure on High Temperature Tensile Properties of TA15 Titanium Alloy

作　　者：贺飞[1] 陈海峰[2] 王玉会[3] 

机构地区：[1]沈阳飞机设计研究所,沈阳110035 [2]中国人民解放军驻沈阳飞机工业(集团)有限公司军事代表室,沈阳110850 [3]北京航空材料研究院,北京100095

出　　处：《材料工程》2012年第2期13-15,19,共4页Journal of Materials Engineering

基　　金：国家973计划资助项目(2007CB613803)

摘　　要：研究了显微组织变化对TA15合金500℃高温拉伸性能的影响。结果表明:初生α相含量增加、α相方向性增强、次生α片变厚及β晶粒尺寸变粗大等显微组织的变化,可使TA15合金500℃高温抗拉强度降低,最大降幅达90MPa以上。研究表明,随初生α相含量增加,增多了晶界数量,而随温度升高晶界强度比晶粒强度下降快,导致高温抗拉强度随初生α相含量增加而降低。The effect of microstructure on the high tensile properties at 500℃ of TA15 titanium alloy was studied.The results show that the increase of primary α phase content,the strengthening of α phase directional,the thickening of secondary α lamellae or the increase of β grain size can reduce the high temperature tensile at 500℃ of TA15 titanium alloy.The largest decrease of high temperature tensile is more than 90MPa by changing the microstructure.The analyses show that the number of grain boundaries is increasing with primary α phase content,and the descent speed of grain boundary strength is faster than that of the grain with the increase of temperature,resulting in the decrease of high temperature tensile.

关 键 词：TA15钛合金 高温拉伸性能 显微组织 α相含量及形貌 β晶粒尺寸 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG113.25[金属学及工艺—金属材料]