(中国科学院 金属研究所，沈阳 110016)
摘 要: 利用Gleeble-3800型热模拟机研究了板条组织Ti60钛合金在温度910~1 085 ℃、应变速率0.001~10 s-1条件下的热压缩变形行为，计算该合金的变形激活能，确立了峰值应力处的流变应力本构方程。结果表明：合金峰值应力随着变形温度的升高和变形速率的降低而降低。应变速率对合金的流变应力的大小有显著影响，在910~970 ℃时该合金的流变应力对变形温度的敏感性大于在1 000~1 085 ℃时的。合金在不同温度区间具有不同的变形激活能与热变形本构关系。
关键字: Ti60合金；热变形；峰值应力；本构关系
（Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:The hot compression deformation behavior of near-α titanium alloy Ti60 with lamellar microstructure was investigated at the temperature range of 910-1 085 ℃ and strain rate of 0.001-10 s-1 by compression testing under isothermal hot working. The results show that the peak stress of this alloy decreases with the increase of deformation temperature and the decrease of strain rate. The flow stress is more sensitive to strain rate and influenced by temperature more obvious at the temperature of 910-970 ℃ than 1 000-1 085 ℃. The constitutive equations fitting peak stress state for hot deformation of Ti60 alloy is obtained. Different activation energy and constitutive equations are obtained when the range of deformation temperature are changed.
Key words: Ti60 alloy; hot working; peak stress; constitutive relationship
