固溶时效处理对高强高韧钛合金显微组织与力学性能的影响  

Effects of solution-aging treatment on microstructure and mechanical properties of a high-strength and high-toughness titanium alloy

作　　者：夏晓洁[1,2] 吴国清[2] 黄正[2] 李志燕[3] 

机构地区：[1]上海飞机设计研究院,上海201210 [2]北京航空航天大学材料科学与工程学院,北京100191 [3]北京航空材料研究院,北京100095

出　　处：《北京航空航天大学学报》2015年第7期1294-1299,共6页Journal of Beijing University of Aeronautics and Astronautics

基　　金：航空科学基金(2012ZEL056);教育部长江学者和创新团队发展计划(IRT0805)

摘　　要：对固溶时效处理后的高强高韧钛合金初生α相的体积分数、尺寸,次生α相的体积分数和αs/β相界面密度等显微组织特征进行了定量表征和统计分析,探讨了随着固溶温度的变化,高强高韧钛合金显微组织与其力学性能间的相关性.结果表明:在α+β两相区固溶时效处理,随着固溶温度的升高,合金初生α相的体积分数降低,相尺寸先降低后略有升高,次生α相的体积分数升高,αs/β相界面密度先升高后降低.初生α相的体积分数与伸长率、静力韧度和裂纹形成功正相关,αs/β相界面密度与合金屈服强度成正相关.Solution-aging treatment was performed to a high-strength and high-toughness titanium alloy. Several microstructural feature including volume fraction of primary α phase, size factor of primary α phase, volume fraction of secondary α phase, α /β interface density, were quantitatively characterized. By making a statistical analysis of the microstructure characteristics, the relationship between microstructure features and mechanical properties of the high-strength and high-toughness titanium alloy was investigated as solution tem- perature changed. The results show that with the increase of solution temperature in α ＋β phase, the volume fraction of primary α phase decreases, the size factor of primary α phase firstly decreases and then increases, volume fraction of secondary α phase increases, and the α /βinterface density increases and then decreases. The elongation, static toughness and crack initiation energy increase with the growth of the volume fraction of primary et phase. And yield strength is positively correlated with the α /β interface density.

关 键 词：近Β钛合金 固溶时效 显微组织 力学性能 量化分析 

分 类 号：TG146.23[一般工业技术—材料科学与工程]