(北京有色金属研究总院 有色金属材料制备加工国家重点实验室，北京 100088)
摘 要: 采用Gleeble-1500热模拟试验机对TiNiCu 合金进行热压缩变形实验，分析该合金在变形温度为600~850 ℃、应变速率为0.5~50条件下的变形行为。采用双曲正弦模型确定该合金的变形激活能Q和应力指数n，建立该合金的热变形本构关系。结果表明：TiNiCu 合金热压缩流变应力受变形温度和应变速率显著影响，流变应力随变形温度的升高和应变速率的下降而降低，材料在低应变速率条件下的软化机制以动态回复为主，在较高应变速率下容易发生动态再结晶。
关键字: TiNiCu合金；热变形；本构模型
（State Key Lab of Nonferrous Metals and Processes, General Research Institute for Non-Ferrous Metals, Beijing 100088, China）
Abstract:Hot compression deformation of TiNiCu alloy was performed on Gleeble-1500 at strains of 0.5-50.0 and deformation temperatures of 600-850 ℃. The constitutive relationship of TiNiCu alloy is obtained based on Arrhenius equations, from which the activation energy Q and stress factor n are derived. The results show that dynamic recovery is the main softening mechanism at lower strain rates, but dynamic recrystallization softening dominates at the higher strain rates. The flow stress decreases with the increase of deformation temperature and the decrease of strain.
Key words: TiNi alloys; hot deformation; constitutive relationship
