(西北有色金属研究院 钛合金研究所，西安 710016)
摘 要: 测试Ti-10Cr合金经900 ℃固溶及400~700 ℃时效后的维氏硬度，采用XRD和TEM分析析出相的成分及形貌，研究硬度、析出相特征与热处理制度之间的关系。结果表明：经900 ℃固溶空冷后，析出相为细小、弥散的等轴ω相和少量α相，合金硬度达到HV560；经400 ℃时效后，ω相和α相长大，合金硬度值稍有下降；经500 ℃时效后，ω相消失，α相长大为片状，合金硬度明显降低；当继续升高时效温度时，片状α相会进一步长大，合金的硬度缓慢降低。
关键字: Ti-10Cr合金；析出相；相形貌；维氏硬度
（Titanium Alloy Research Center, Northwester Institute for Nonferrous Metal Research, Xi’an 710016, China）
Abstract:The Vickers-hardness of Ti-10Cr alloy was tested after being solution treated at 900 ℃ as well as following by aging treatment at 400−700 ℃. The precipitated phases and their morphologies during solution and aging were analyzed by XRD and TEM. Furthermore, the relationships among hardness, phase precipitation and heat treatment were discussed. The results indicate that the fine dispersion isothermal ω phase and few α phase form in the metastable beta matrix after solution treatment at 900 ℃ following by air cold. Under this condition, the hardness reaches HV560. ω phase and α phase grow after aging at 400 ℃, and the hardness shows a little decrease. ω phase is decomposed and α phase becomes lamella after aging at 500 ℃, and the hardness value of the alloy deceases remarkable. After that, with the increase of aging temperature, the hardness decreases slowly due to the α phase growth.
Key words: Ti-10Cr alloy; precipitated phase; morphology; Vickers-hardness
