(1. 太原理工大学 材料科学与工程学院，太原 030034；
2. 山西工程技术学院，阳泉 045000)
摘 要: 层错能是金属材料重要的本征参数，对金属材料变形机制和力学性能有着重要的影响。特别是在强烈塑性变形过程中，层错能的变化对金属变形机制和晶粒细化机制有着决定性作用。层错能的测定或计算方法有很多种，热力学法能够方便快捷地计算出层错能的值，可以直观地判断温度、成分等对合金层错能的影响。采用热力学方法计算纯Cu及Cu-Ti、Cu-Zn合金的层错能，计算结果表明：在室温条件下，Cu-Ti和Cu-Zn合金的层错能都随溶质元素含量的增加而降低，两种合金中添加相同含量的溶质元素，溶质元素Ti对合金层错能的影响更大；两种合金偏聚自由能随溶质元素含量的增加而升高。
关键字: 铜合金；层错能；热力学
（1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. Shanxi Institute of Technology, Yangquan 045000, China）
Abstract:Stacking fault energy (SFE) is an intrinsic parameter of metallic material, which has a significant impact on the plastic deformation mechanism and mechanical property. Especially for severe plastic deformation, the SFE can change the deformation and grain refinement mechanism of metal. There are many measurements or methods for calculating the value of SFE. Thermodynamic method, as one of the widely adopted way, can visually detect the effect of the temperature and alloying elements on the SFE. The thermodynamic method was used to estimate the SFE value of Cu, Cu-Ti and Cu-Zn alloys. The results show that at room temperature, the SFE values of Cu-Ti and Cu-Zn alloys decrease with the concentration of alloying elements increasing. When the same solute element content of two kinds of alloys is added, the solute Ti has more influence on the stacking fault energy of alloy. The segregation free energy for Cu-Zn and Cu-Ti alloy would be raised with the increasing of solute elements.
Key words: Cu alloy; stacking fault energy; thermodynamic
