材料科学
放电等离子烧结
钨
烧结
氧化物
氧化钨
可塑性
抗压强度
粒度
复合材料
色散(光学)
冶金
光学
物理
作者
Li-Chun Huang,Lin Jiang,Troy D. Topping,Chen Dai,Xin Wang,Ryan Carpenter,Chris Haines,Julie M. Schoenung
标识
DOI:10.1016/j.actamat.2016.09.034
摘要
In this work a novel process methodology to concurrently improve the compressive strength (2078 MPa at a strain rate of 5 × 10−4 s−1) and strain-to-failure (over 40%) of bulk tungsten materials has been described. The process involves the in situ formation of intragranular tungsten oxide nanoparticles, facilitated by the application of a pressure of 1 GPa at a low sintering temperature of 1200 °C during spark plasma sintering (SPS). The results show that the application of a high pressure of 1 GPa during SPS significantly accelerates the densification process. Concurrently, the second phase oxide nanoparticles with an average grain size of 108 nm, which are distributed within the interiors of the W grains, simultaneously provide strengthening and plasticity by inhibiting grain growth, and generating, blocking, and storing dislocations.
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