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Molecular dynamics simulation and micropillar compression of deformation behavior in iridium single crystals

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Abstract

The compression behaviors of iridium single crystals with different crystalline orientations were investigated by micropillar compression tests and molecular dynamics (MD) simulations. The results indicated that the deformation process of iridium single crystals with [100] and [110] orientations was presented as the stacking faults expansion and the formation of Lomer–Cottrell locks. And the occurrence of Lomer–Cottrell locks was considered as the interaction of stacking faults on {111} planes by MD simulations. The evolution of crystal structure in compression indicated that the Lomer–Cottrell locks might contribute to the large plastic deformation of iridium single crystals. Moreover, the deformation features in MD simulations showed that the elastic modulus (E) and yield stress (σs) of iridium single crystals were significantly influenced by the temperature. The elastic modulus and yield stress gradually decreased with an increased temperature for all orientations. Meanwhile, the single crystal with a closely spaced lattice structure exhibited superior mechanical properties at a same temperature.

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Acknowledgements

This study was financially supported by the National Key R&D Program of China (No. 2017YFB0305503), the Joint Funds of the National Natural Science Foundation of China (No. U1202273) and the National Natural Science Foundation of China (No. 51501075).

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China

    Jia-Qi Wu, Rui Hu, Jie-Ren Yang, Bin Gan & Gong-Liao Luo

  2. State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metal, Sino-platinum Metals Co., Ltd., Kunming Institute of Precious Metals, Kunming, 650106, China

    Yi Liu & Xi-Ming Luo

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  1. Jia-Qi Wu
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  2. Rui Hu
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  6. Yi Liu
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Correspondence to Jie-Ren Yang.

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Wu, JQ., Hu, R., Yang, JR. et al. Molecular dynamics simulation and micropillar compression of deformation behavior in iridium single crystals. Rare Met. 42, 3510–3517 (2023). https://doi.org/10.1007/s12598-019-01215-4

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  • DOI: https://doi.org/10.1007/s12598-019-01215-4

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