In situ oxide dispersion strengthened tungsten alloys with high compressive strength and high strain-to-failure

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• 作者：Lin Huang^a ; ^b ; ^c ; Lin Jiang^a ; ^c ; Troy D. Topping^c ; ^d ; Chen Dai^c ; Xin Wang^a ; ^c ; Ryan Carpenter^e ; Christopher Haines^e ; Julie M. Schoenung^a ; ^c ; ^{Julie.Schoenung@UCI.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：High-pressure spark plasma sintering (HP-SPS) ; Tungsten ; In situ oxide dispersion strengthening ; Improved compressive behavior
• 刊名：Acta Materialia
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：122
• 期：Complete
• 页码：19-31
• 全文大小：6016 K

文摘

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.