(1. 中南大学 粉末冶金国家重点实验室，长沙 410083；
2. 昆明理工大学 材料科学与工程学院，昆明 650093)
摘 要: 研究微波烧结88W-5Mo-4.9Ni-2.1Fe和78W-15Mo-4.9Ni-2.1Fe两种W基合金，并与常规烧结该合金的性能进行比较。通过扫描电镜观察材料的显微组织，利用EDS能谱分析W晶粒和合金粘接相的成分，采用XRD分析样品的物相组成。结果表明：在1 480 ℃微波烧结5 min条件下，88W和78W合金的密度分别为16.70 g/cm3和15.55 g/cm3，抗拉强度分别达到1 175 MPa和1 065 MPa，伸长率分别为3.0%和6.9%，硬度值分别达40.3 HRC和32.5 HRC，其力学性能均超过常规烧结合金。微波烧结合金晶粒细小均匀，常规烧结78W合金组织中有中间相组织存在，导致其性能恶化，而微波烧结78W合金组织中未发现该中间相存在。
关键字: W-Mo-Ni-Fe合金；微波烧结；力学性能；显微组织
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. School of Materials Science and Engineering, Kunming University of Science and Technology,
Kunming 650093, China）
Abstract:88W-5Mo-4.9Ni-2.1Fe and 78W-15Mo-4.9Ni-2.1Fe alloys were microwave sintered, and their properties were compared with conventional sintered alloys. The microstructure of alloys was analyzed by scan electronic microscopy. The element contents of W grains and matrix was characterized by EDS and the phase composition was determined by XRD. The results show that the 88W alloy has density of 16.70 g/cm3, tensile strength of 1 175 MPa, elongation of 3.0% and hardness of 40.3 HRC, the 78W alloy has density of 15.55 g/cm3, tensile strength of 1 065 MPa, elongation of 6.9% and hardness of 32.5 HRC after microwave sintering at 1 480 ℃ for 5 min. The properties of microwave sintered alloys excel conventional sintering. The microwave sintering results in a finer microstructure. The existence of an intermetallic phase in conventional sintered 78W alloys leads to the properties deteriorating. However, there is no intermetallic phase in the microwave sintered 78W alloys.
Key words: W-Mo-Ni-Fe alloys; microwave sintering; mechanical properties; microstructure
