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Effects of the alloying element on the stacking fault energies of dilute Ir-based superalloys: A comprehensive first-principles study

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Abstract

Iridium (Ir) has an extremely high melting point (2443 °C), high chemical stability and is one of the most promising high-temperature materials. However, Ir is more difficult to process compared with other face-centered cubic metals, such as Ni and Al, which limits its applications. To solve this problem, we study the effect of 32 alloying elements (X) on stacking fault energy of dilute Ir-based alloys generated by shear deformation using the first-principles calculations. The investigation reveals that there are many alloying elements studied herein decrease the stacking fault energy of face-centered cubic (fcc) Ir, and the most effective element in reducing stacking fault energy of fcc Ir is Zn. The microscopic mechanism is caused by electron redistribution in the local stacking fault area. These results are expected to provide valuable guidance for the further design and application of Ir-based alloys.

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Acknowledgments

The authors thank the financial support from the Rare and Precious Metals Material Genetic Engineering Project of Yunnan Province (2019, 202002AB080001-1) and the Open Fund of the National Joint Engineering Research Center for abrasion control and molding of metal materials (No. HKDNM201904).

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Authors and Affiliations

  1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China

    Gengsen Xu, Xiaoyu Chong, Yunxuan Zhou, Rong Zhou & Jing Feng

  2. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA

    Xiaoyu Chong

  3. Sino-Precious Metals Holding Co., Ltd., Kunming, 650093, China

    Yan Wei, Changyi Hu & Aimin Zhang

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  1. Gengsen Xu
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  2. Xiaoyu Chong
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  4. Yan Wei
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Correspondence to Xiaoyu Chong or Yan Wei.

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Xu, G., Chong, X., Zhou, Y. et al. Effects of the alloying element on the stacking fault energies of dilute Ir-based superalloys: A comprehensive first-principles study. Journal of Materials Research 35, 2718–2725 (2020). https://doi.org/10.1557/jmr.2020.277

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  • DOI: https://doi.org/10.1557/jmr.2020.277

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