Site preference of metallic elements in M23C6 carbide in a Ni-based single crystal superalloy

Site preference of metallic elements in M23C6 carbide in a Ni-based single crystal superalloy
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镍基单晶高温合金中M23C6碳化物中金属元素的位点偏好

DOI:
10.1016/j.matdes.2017.05.023
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发表时间:
2017-09
影响因子:
8.4
通讯作者:
Liu Yinong
Liu Yinong
中科院分区:
材料科学1区
文献类型:
--
作者:
Xiang Sisi;Mao Shengcheng;Shen Zhenju;Long Haibo;Wei Hua;Ma Shiyu;Zhang JianXin;Chen Yanhui;Zhang Jianfei;Zhang Bin;Liu Yinong

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M23C6碳化物是镍基高温合金中常见的沉淀相。碳化物通常是合金卡宾并且通常包含多于一种金属元素。本研究通过像差校正高角度环形暗场扫描透射电子显微镜(HAADF-STEM)技术和基于定量STEM(QSTEM)的图像模拟方法确定了镍基单晶中M23C6碳化物中金属元素的位点偏好。发现碳化物主要含有 Cr 和 Re,还有少量 Mo。基于 HAADF-STEM 和 QSTEM 的模拟分析表明,重原子更喜欢在 8c 位点取代 Cr。
M23C6carbide is a common precipitate phase present in Ni-based superalloys. The carbide is generally an alloy carbine and often contains more than one metallic element. In this study, the site preference of metallic elements in M23C6carbide in a Ni-based single crystal was determined by means of aberration-corrected High-Angle Annular Dark Field Scanning Transmission Electron Microscopy (HAADF-STEM) technique and quantitative STEM (QSTEM)-based image simulation method. The carbide was found to contain mostly Cr and Re, with a small amount of Mo. The HAADF-STEM and QSTEM-based simulation analyses indicate that heavy atoms prefer to substitute Cr at 8c sites.
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