(1. 中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083；
2. 昆明理工大學(xué) 材料科學(xué)與工程學(xué)院，昆明 650093)
摘 要: 研究微波燒結(jié)88W-5Mo-4.9Ni-2.1Fe和78W-15Mo-4.9Ni-2.1Fe兩種W基合金，并與常規(guī)燒結(jié)該合金的性能進(jìn)行比較。通過掃描電鏡觀察材料的顯微組織，利用EDS能譜分析W晶粒和合金粘接相的成分，采用XRD分析樣品的物相組成。結(jié)果表明：在1 480 ℃微波燒結(jié)5 min條件下，88W和78W合金的密度分別為16.70 g/cm3和15.55 g/cm3，抗拉強(qiáng)度分別達(dá)到1 175 MPa和1 065 MPa，伸長(zhǎng)率分別為3.0%和6.9%，硬度值分別達(dá)40.3 HRC和32.5 HRC，其力學(xué)性能均超過常規(guī)燒結(jié)合金。微波燒結(jié)合金晶粒細(xì)小均勻，常規(guī)燒結(jié)78W合金組織中有中間相組織存在，導(dǎo)致其性能惡化，而微波燒結(jié)78W合金組織中未發(fā)現(xiàn)該中間相存在。
關(guān)鍵字: W-Mo-Ni-Fe合金；微波燒結(jié)；力學(xué)性能；顯微組織
（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
