Ti-Al-Cr两相钛合金的组织与性能研究  

Microstructure and Mechanical Properties of Ti-Al-Cr System Titanium Alloy

作　　者：周伟[1] 葛鹏[1] 赵永庆[1] 

机构地区：[1]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属快报》2008年第7期27-29,共3页Rare Metals Letters

基　　金：国家重点基础研究发展计划(973计划)资助项目(2007CB613805)

摘　　要：研制了一种Ti-Al-Cr两相钛合金。实验用合金采用真空自耗电弧熔炼,在α+β两相区锻造成60mm×60mm的方棒。用金相法测试合金相变点为(970±5)℃。为了解热处理制度对合金显微组织和力学性能的影响,合金经过4种工艺制度进行热处理。用金相显微镜观测了不同热处理制度下的组织特征,并测试其力学性能。研究结果表明,相变点以下固溶处理得到双态组织,随着固溶温度的升高,初生α相含量减少,合金强度升高,塑性呈下降趋势。β固溶处理后得到魏氏组织,合金强度和韧性匹配高于相同热处理条件TC4合金水平。In the paper, a sort of Ti-Al-Cr system titanium alloy was studied. The alloy was prepared by vacuum arc melting and forg- ing at the temperature of α＋β area. The/transition temperature measured by metallographic analysis is （970±5）℃. In order to gain the relationship between microstructure and mechanical properties, the heat treatment was subjected to 4 kinds of process. The microstructure in new Ti-Al-Cr System Titanium Alloy was observed using OM and the mechanical properties tested. The results show that the bimodal microstructure has been gotten after solid solution treatment at bellow/transition temperature, and the quality of primary phase decreases with the increase of solid solution temperature, which the strength and ductility was improved. After heat treatment in β zone, lamellar microstructure was acquired＇, which the strength and fracture toughness of Ti-Al-Cr alloy are better than that of Ti- 6Al-4V alloy.

关 键 词：Ti—Al-Cr 钛合金 显微组织 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]