(1. 沈阳大学 机械工程学院，沈阳 110044；
2. 中国科学院 金属研究所 沈阳材料国家(联合)实验室，沈阳 110016)
摘 要: 研究电子束熔化逐层成形法(AM-EBM)制备Ti-6Al-4V合金的组织与力学性能，并与锻态Ti-6Al-4V合金进行比较。结果表明：EBM 法制备的Ti-6Al-4V合金的显微组织以α相片层为主，片层之间有少量β相；α相片层厚度随堆积高度的增加而变大，到一定堆积高度后其层片厚度趋于稳定；与锻态合金相比，EBM 法制备的Ti-6Al-4V合金表现出较高的屈服强度和抗拉强度，两种合金均表现出良好的拉伸塑性；EBM Ti-6Al-4V合金的断裂方式为典型的韧窝型穿片层断裂。
关键字: 电子束熔化；Ti-6Al-4V合金；显微组织；拉伸性能；锻态
（1. College of Mechanical Engineering, Shenyang University, Shenyang 110044, China;
2. Shenyang National Laboratory for Materials Science, Institute of Metal Research,
Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:Microstructures and mechanical properties of Ti-6Al-4V alloy fabricated by electron beam melting (EBM) were investigated and compared to those of wrought Ti-6Al-4V plates. The results indicate that the EBM Ti-6Al-4V alloy mainly consists of α lamellas with small amount of β phase. The thickness of the α lamellas increases with the distance from the building plate and tends to remain stable at the certain building distance. EBM Ti-6Al-4V samples possess higher ultimate tensile strength (UTS) and yield strength (YS) than the wrought Ti-6Al-4V plates. There are no significant differences in ductility between EBM and wrought Ti-6Al-4V alloys. Dimple translamella is observed by SEM on fractured EBM Ti-6Al-4V tensile specimen.
Key words: electron beam melting; Ti-6Al-4V alloy; microstructures; mechanical properties; wrought
