Morphological evolution of MC carbide in K465 superalloy
Morphological evolution of MC carbide in K465 superalloy
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DOI：
10.1007/s10853-006-0684-5
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发表时间：
2006-09
影响因子：
4.5
通讯作者：
Yang Jinxia;Zheng Qi;Sun Xiaofeng;Guan Hengrong;H. Zhuangqi
中科院分区：
文献类型：
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作者：
Yang Jinxia;Zheng Qi;Sun Xiaofeng;Guan Hengrong;H. Zhuangqi
接受日期: 17 July 2006/Published online: 2 September 2006© Springer Science+ Business Media, LLC 2006 具有立方结构的碳化物是一种混合碳化物，其金属原子含有大量的 Ti、Nb 和 W，以及少量的 Cr 和 Mo。因此，根据上述分析，与 WC 型和 TiC 型碳化物相比，MC 碳化物是稳定的。此外，MC 碳化物具有 NaCl结构，其与基体的共格面为(111)和(100)面，如图2b所示，显示(111)MC//(111)c和(100)MC//(100)c。与其他形状相比，MC碳化物片与基体具有更好的一致性[9, 11]。因此，MC碳化物与基体之间良好的共格性产生了较小的失配能。因此，MC碳化物片晶比块状MC碳化物颗粒具有更大的表面积，但导致更小的晶格失配能。脚本状MC碳化物在高温下容易分解，因为这种取向关系被破坏，随着MC碳化物的分解，这种取向关系逐渐消失。
Accepted: 17 July 2006/Published online: 2 September 2006© Springer Science+ Business Media, LLC 2006 carbide having a cubic structure is a mixed carbide with the metallic atoms of the large amount of Ti, Nb and W, and a small amount of Cr and Mo. Hence, this MC carbide is stable in contrast to WC-type and TiC-type carbides according to the above analysis.In addition, MC carbide has a NaCl structure, and its coherent planes with the matrix is (111) and (100) planes as shown in Fig. 2 b showing (111) MC//(111) c and (100) MC//(100) c. The MC carbide platelet had better conherency with the matrix than other shapes [9, 11]. As a result, the small misfit energy is produced by the good coherency between the MC carbide and matrix. Accordingly, the MC carbide platelet has a larger surfacial area than the blocky MC carbide particles, but causes smaller lattice misfit energy. Script-like MC carbide is prone to decompose at high temperature because this orientation relationship is destroyed, which is gradually lost accompanying the decomposition of MC carbide.