C-Cr segregation at grain boundary before the carbide nucleation in Alloy 690
C-Cr segregation at grain boundary before the carbide nucleation in Alloy 690
复制标题
合金 690 中碳化物成核前晶界处的 C-Cr 偏析
DOI：
10.1016/j.matchar.2012.02.008
复制
发表时间：
2012-04-01
影响因子：
4.7
通讯作者：
Liu, Wenqing
中科院分区：
文献类型：
--
作者：
Li, Hui;Xia, Shuang;Liu, Wenqing
用原子探针法研究了690合金的晶界偏析。B、C和Si在晶界偏析。每个偏析元素的高浓度区形成一组在晶界彼此平行的直线阵列。飞机。晶界面上的浓度波动周期约为7 nm。在Cr23C6晶界形核之前，C-Cr共偏析在晶界一侧，但没有检测到确切的晶界核心区。讨论了晶界碳化物只与附近晶界位于高折射率晶面的一侧具有共格取向关系的原因。(C)2012 Elsevier Inc.保留所有权利。
The grain boundary segregation in Alloy 690 was investigated by atom probe tomography. B, C and Si segregated at the grain boundary. The high concentration regions for each segregation element form a set of straight arrays that are parallel to each other in the grain boundary. plane. The concentration fluctuation has a periodicity of about 7 nm in the grain boundary plane. Before the Cr23C6 nucleation at grain boundaries, the C-Cr co-segregate on one side of the grain boundaries while not the exact grain boundary core regions have been detected. The reasons why grain boundary carbides have coherent orientation relationship only with one side of nearby grain which grain boundary is located at high index crystal plane were discussed. (C) 2012 Elsevier Inc. All rights reserved.