(1. 宝鸡钛业股份有限公司，宝鸡721014; 2. 中国科学院 金属研究所，沈阳110016)
摘 要: 将二次真空自耗熔炼的Ti-55钛合金铸锭轧制成1.2 mm厚的薄板，研究Ti-55钛合金超塑性板材的显微组织与力学性能。结果表明，显微组织均匀，晶粒极细的Ti-55钛合金超塑性板材, 具有良好的室温拉伸性能和超塑性能。超塑性拉伸试验表明，在一定的变形温度范围(880~920 ℃)与变形速率(1.4×10−3 s−1)下，Ti-55钛合金板材超塑性伸长率可达到700%以上。
关键字: Ti-55钛合金；超塑性；显微组织；力学性能
（1. Baoji Titanium Industry Co., Ltd., Baoji 721014, China;
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:The 1.2 mm thick plates of Ti-55 alloy were rolled from ingots melted by twice vacuum arc furnaces. Microstructure and properties of superplastic plate of Ti-55 alloy were studied. The results show that very fine crystalline grain and good room temperature tensile property have obtained through improved rolling processing. With this processing, a total elongation above 700% could be obtained at 880−920 ℃ at strain rate of 1.4×10−3 s−1.
Key words: Ti-55 alloy; superplasticity; microstructure; mechanical property
