(北京科技大学 材料科学与工程学院，北京100083)
摘 要: 采用Gleeble?1500型热模拟机对电铸Ni-W合金在变形温度为400~600 ℃、应变速率为0.001~0.1 s?1条件下的热压缩变形进行研究，分析合金变形时的流变应力、应变速率及变形温度之间的关系，研究变形温度对合金显微组织的影响，并得到本构方程。结果表明：应变速率和变形温度对该材料的流变应力有显著影响，流变应力随变形温度的升高而降低，随应变速率的提高而增大。当变形温度高于550 ℃时，合金流变曲线呈现出明显的动态再结晶特征，合金显微组织为完全的动态再结晶组织，该合金的热变形激活能为411.55 kJ/mol。
关键字: 热压缩变形；电铸；Ni-W合金；变形激活能；本构方程
（School of Materials Science and Technology, University of Science and Technology Beijing, Beijing 100083, China）
Abstract:The hot compression deformation of electroformed Ni-W alloy was studied in the temperature range of 400?600 ℃ and strain rate of 0.001?0.1 s?1 by using Gleeble?1500 thermal simulation tester. The relationships among the flow stress, the strain rate and deformation temperature were researched. The effect of deformation temperature on microstructure of the ally was investigated. The results show that the flow stress decreases with the increase of deforming temperature, while it increase with the increase of strain rate. When the deformation temperature is higher than 550 ℃, the flow curves and microstructures present apparent character of dynamic recrystallization. The hot deformation activation energy of the alloy is 411.55 kJ/mol.
Key words: hot compression deformation; electroformed; Ni-W alloy; deformation activation energy; constitutive equation
