The dependence of carbide morphology on grain boundary character in the highly twinned Alloy 690
The dependence of carbide morphology on grain boundary character in the highly twinned Alloy 690
复制标题
高度孪晶合金 690 中碳化物形态对晶界特征的依赖性
DOI：
10.1016/j.jnucmat.2010.01.008
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发表时间：
2010-04-01
影响因子：
3.1
通讯作者：
Hu, Changliang
中科院分区：
文献类型：
--
作者：
Li, Hui;Xia, Shuang;Hu, Changliang
利用扫描电镜（SEM）和透射电镜（TEM）研究了具有高比例低σ重合点阵（CSL）晶界的690合金（Ni-30 Cr-10 Fe，质量分数，%）中晶界碳化物形态与晶界特征的关系。通过深腐蚀去除了部分表面晶粒。碳化物在晶界呈树枝状生长。在非共格孪晶界和孪晶相关的σ 9晶界附近观察到的碳化物棒实际上是这些晶界上碳化物的二次枝晶。在随机晶界上可以观察到更高阶的枝晶，然而，在Sigma 27晶界和随机晶界附近没有观察到棒状枝晶。本文根据实验结果，讨论了不同性质晶界处碳化物析出形态的差异。(C)2010 Elsevier B. V.保留所有权利。
The dependence of morphology of grain boundary carbides on grain boundary character in Alloy 690 (Ni-30Cr-10Fe, mass fraction, %) with high fraction of low Sigma coincidence site lattice (CSL) grain boundaries was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Some of the surface grains were removed by means of deep etching. It was observed that carbides grow dendritically at grain boundaries. The carbide bars observed near incoherent twin boundaries and twin related Sigma 9 grain boundaries are actually secondary dendrites of the carbides on these boundaries. Higher order dendrites could be observed on random grain boundaries, however, no bar-like dendrites were observed near Sigma 27 grain boundaries and random grain boundaries. The morphology difference of carbides precipitated at grain boundaries with different characters is discussed based on the experimental results in this paper. (C) 2010 Elsevier B.V. All rights reserved.