力學性能
( 1. 哈爾濱工業(yè)大學 材料科學與工程學院，
哈爾濱 150001;
2. 哈爾濱工業(yè)大學 復合材料研究所, 哈爾濱 150001)
摘 要: 分析了95W-5（Ni/Fe/Co）合金的粉末冶金工藝特點及低溫顯微組織與力學性能, 給出了力學性能與溫度的關系曲線。 通過對合金拉伸試樣斷口的掃描電鏡分析，揭示了該合金低溫力學性能與組織變化的微觀本質(zhì)。 結(jié)果表明： 95W-5（Ni/Fe/Co）合金室溫下具有較高的強度及一定的塑性；該合金低溫脆化的主要原因是由于屈服強度隨溫度的降低而增加， 鎢顆粒過早解理及粘結(jié)相變形極小引起的； 95W-5（Ni/Fe/Co）合金的冷脆性轉(zhuǎn)變溫度在-50℃左右， 此時脆性斷裂以鎢顆粒的自身解理為主。
關鍵字: 95W-5（Ni/Fe/Co）合金; 低溫顯微組織; 力學性能; 脆化
of 95W-5（Ni/Fe/Co） alloy
（ 1. School of Materials Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, China;
2. Institute of Composite Materials, Harbin Institute of Technology, Harbin 150001, China）
Abstract: The characteristics of podwer metallurgy, low temperature microstructure and mechanical properties for 95W-5(Ni/Fe/Co) alloys were studied, the relation curves between mechanical properties and temperature were provided. After analyzing the tensile fracture of the alloy with SEM, the microcosmic essential of diversification of this alloy was discovered by discussing low temperature microstructure and mechanical properties. The results indicate that the alloy has much higher strength and certain plasticity. The main reason for low temperature embrittlement is that the yield strength increases with temperature dropping, the tungsten particles cleave prematurely and the binding phases deform hardly. The transition temperature of 95W-5(Ni/Fe/Co) alloy is about -50℃, at which the embrittlement mainly results from the cleavage of tungsten particles.
Key words: 95W-5(Ni/Fe/Co)alloy; low temperature microstructure; mechanical property; embrittlement
