Effect of heat treatment on the decomposition of TiC-ZrC solid solutions by spark plasma sintering

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• 作者：Ying Li ^{li-ying87@imr.tohoku.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Hirokazu Katsui ; ^{katsui@imr.tohoku.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Takashi Goto ^{goto@imr.tohoku.ac.jp" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Phase decomposition ; Titanium carbide ; Zirconium carbide ; Microstructure ; Mechanical property
• 刊名：Journal of the European Ceramic Society
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：36
• 期：15
• 页码：3795-3800
• 全文大小：3758 K

文摘

TiC–ZrC solid solutions at ZrC composition of 5–90 mol% were consolidated by spark plasma sintering of TiC and ZrC powders. The phase decomposition behavior by heat-treatment at 1273–2273 K was investigated. TiC–ZrC solid solutions with 10–70 mol% ZrC decomposed into TiC- and ZrC-rich phases after heat treatment at 1473–2273 K for 3.6 ks. The decomposition resulted in the formation of nodular structures several tens to hundreds nanometers in length with coherent crystal orientation relationship of the TiC-rich phase {100} // ZrC-rich phase {100}. The Vickers hardness and fracture toughness increased with increasing heat-treatment temperature and reached maximum values of 26 GPa and 3.0 MPa m^1/2, respectively, for 80TiC–20ZrC heat treated at 1873 K.