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

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

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    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 gamma' and gamma phases in a Co-Al-W-Ti-Ta superalloy and the site preference of its alloying elements in the ordered L1(2) gamma' phase. A semi-quantitative analysis of atomic column compositions in the ordered L1(2) gamma' 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(2) gamma phase. These findings agree well with predictions from first principles simulations in the literature.

    Original languageEnglish
    Article number17240
    Number of pages6
    JournalScientific Reports
    Publication statusPublished - 8 Dec 2017

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