Co-Al-W基高温合金中的元素偏好与原子尺度的位点识别

Elemental preference and atomic scale site recognition in a Co-Al-W-base superalloy.

作者信息

Chen Yanhui, Xue Fei, Mao Shengcheng, Long Haibo, Zhang Bin, Deng Qingsong, Chen Bin, Liu Yinong, Maguire Pierce, Zhang Hongzhou, Han Xiaodong, Feng Qiang

机构信息

Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, China.

State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China.

出版信息

Sci Rep. 2017 Dec 8;7(1):17240. doi: 10.1038/s41598-017-17456-1.

DOI:10.1038/s41598-017-17456-1

PMID:29222467

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5722911/

Abstract

Using state-of-the-art atomic scale super energy dispersive X-ray spectroscopy and high angle annular dark field imaging this study reveals the elemental partitioning preference between the γ' and γ phases in a Co-Al-W-Ti-Ta superalloy and the site preference of its alloying elements in the ordered L1 γ' phase. A semi-quantitative analysis of atomic column compositions in the ordered L1 γ' structure is provided. Co atoms were found to occupy the {1/2, 1/2, 0} face-center positions whereas Al, W, Ti and Ta atoms prefer to occupy the {0, 0, 0} cube corner positions in the L1 γ phase. These findings agree well with predictions from first principles simulations in the literature.

摘要

本研究利用最先进的原子尺度超能量色散X射线光谱和高角度环形暗场成像技术，揭示了Co-Al-W-Ti-Ta高温合金中γ'相和γ相之间的元素分配偏好，以及其合金元素在有序L1₂γ'相中的位置偏好。提供了对有序L1₂γ'结构中原子柱组成的半定量分析。发现Co原子占据{1/2, 1/2, 0}面心位置，而Al、W、Ti和Ta原子更倾向于占据L1₂γ相中的{0, 0, 0}立方角位置。这些发现与文献中第一性原理模拟的预测结果非常吻合。