放电等离子烧结温度对W-30Re合金组织性能的影响

Effect of Sintering Temperature on Microstructure and Properties of W-30Re Heavy Alloy by Spark Plasma Sintering

利用放电等离子烧结技术制备W-30Re合金,研究烧结温度对合金致密度、显微硬度、显微组织和断裂方式的影响。结果表明,利用放电等离子烧结技术可以在较短时间内制备出晶粒细小,组织均匀的高密度W-30Re合金。随着烧结温度的升高,合金的致密度与硬度不断增大,合金中粘结相的数量不断增加;合金的断裂方式由沿晶断裂转变为以沿晶断裂为主,以粘结相的延性撕裂为辅的断裂方式。

W-30Re heavy alloy was prepared by spark plasma sintering （SPS） technology. The effects of sintering temperature on density, hardness, microstructure and fracture mode of the alloy were investigated. Results show that the SPS technique could prepare W-30Re heavy alloy with fine grains and homogeneous microstructure in a relatively short period of time. With the increase of sintering temperature, the density and hardness of the sintered alloy always increase, and the number of binder phases in the alloy increases. The fracture mode of the alloy transfers from typical brittle intergranular fracture to more and more cleavage fracture and ductile tearing of binding phase.