Strategy to design high performance TiB 2 ‐based materials: Strengthen grain boundaries by solid solute segregation
Strategy to design high performance TiB 2 ‐based materials: Strengthen grain boundaries by solid solute segregation
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设计高性能TiB 2 基材料的策略：通过固溶偏析强化晶界
DOI：
10.1111/jace.17018
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发表时间：
2020-05
影响因子：
3.9
通讯作者：
Yanchun Zhou
中科院分区：
文献类型：
--
作者：
Fu‐Zhi Dai;Huimin Xiang;Yanchun Zhou
TiB2exhibits a unique combination of excellent properties that make it promising candidate for applications in extreme environments, where retention of strength at high temperatures is essential. Tailoring grain boundary properties by segregation is believed a prominent way to design high‐temperature performance of ceramics. In this work, segregation tendencies of solute elements, including Sc, Y, Zr, Hf, V, Nb, Ta, Cr, Mo, and W, in TiB2grain boundaries and the strengthening/weakening effects induced by segregations are investigated by first‐principles calculations. The results reveal that small atoms tend to segregate to grain boundary sites with local compression strains, while large atoms prefer grain boundary sites with local expansion strains. Deteriorated grain boundary strength is usually caused by additional expansion strain induced by segregation, while improved grain boundary strength results from either enhanced local bonding induced by segregation of small atoms or increased fracture strain due to segregation of large atoms. Cr and V, especially Cr, exhibit strong segregation tendency and improvement on grain boundary strength, which provides useful guidelines for the design of high performance TiB2‐based materials.
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影响因子：
5.7
作者：
Marc W. Bird;Robert P. Aune;A. Thomas;P. Becher;K. White
通讯作者：
Marc W. Bird;Robert P. Aune;A. Thomas;P. Becher;K. White
超强材料，适用温度超过 2000 °C。
影响因子：
4.6
作者：
Silvestroni L;Kleebe HJ;Fahrenholtz WG;Watts J
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Watts J
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影响因子：
3.3
作者：
Fu-Zhi Dai;Yanchun Zhou
通讯作者：
Yanchun Zhou
影响因子：
4.5
作者：
Van Wie, DM;Drewry, DG;Hudson, CM
通讯作者：
Hudson, CM
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影响因子：
8.4
作者：
Hai-Bin Ma;Zhen-Yong Man;Ji-Xuan Liu;Fang-Fang
通讯作者：
Fang-Fang