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含短程有序结构的CrCoNi中熵合金中的纳米压痕诱导晶体塑性

Nanoscale Indentation-Induced Crystal Plasticity in CrCoNi Medium-Entropy Alloys Containing Short-Range Order.

作者信息

Ren Meijing, Han Fengbo, Zhu Xu, Peng Yue, Zu Yanqing, Liu Peitao, Feng Ailing

机构信息

Institute of Physics & Optoelectronics Technology, Baoji University of Arts and Sciences, Baoji 721016, China.

Advanced Materials Research Center, Technology Innovation Institute, Abu Dhabi 9639, United Arab Emirates.

出版信息

Materials (Basel). 2024 Dec 4;17(23):5932. doi: 10.3390/ma17235932.

DOI:10.3390/ma17235932
PMID:39685368
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11642976/
Abstract

CrCoNi medium-entropy alloys (MEAs), characterised by their high configurational entropies, have become a research hotspot in materials science. Recent studies have indicated that MEAs exhibit short-range order (SRO), which affects their deformation mechanisms. In this study, the micro-mechanisms of SRO within the framework of mesoscale continuum mechanics are mathematically evaluated using an advanced, non-local crystal plasticity constitutive framework. Furthermore, a crystal plasticity model considering the impact of SRO on slip is established. By combining nanoindentation simulations and multi-level grain model tensile simulations, the load-displacement and stress-strain curves demonstrated that the presence of SRO increases the hardness of MEAs. More specifically, considering the distribution of shear strain and geometrically necessary dislocations, the heterogeneity of MEAs increases with an increase in the degree of SRO. This study not only enriches the crystal plasticity theory but also provides references for the microstructure and performance regulation of high-performance multi-level grain structure materials.

摘要

CrCoNi中熵合金（MEA）以其高组态熵为特征，已成为材料科学中的一个研究热点。最近的研究表明，中熵合金表现出短程有序（SRO），这会影响其变形机制。在本研究中，使用先进的非局部晶体塑性本构框架，在细观尺度连续介质力学框架内对短程有序的微观机制进行了数学评估。此外，建立了一个考虑短程有序对滑移影响的晶体塑性模型。通过结合纳米压痕模拟和多级晶粒模型拉伸模拟，载荷-位移曲线和应力-应变曲线表明，短程有序的存在增加了中熵合金的硬度。更具体地说，考虑到剪切应变和几何必要位错的分布，中熵合金的不均匀性随着短程有序程度的增加而增加。本研究不仅丰富了晶体塑性理论，也为高性能多级晶粒结构材料的微观结构和性能调控提供了参考。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/c2389743df4d/materials-17-05932-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/2d0719438c16/materials-17-05932-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/01b0f3229955/materials-17-05932-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/1f6cce9b130a/materials-17-05932-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/8a33876d68e1/materials-17-05932-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/596abf3ee144/materials-17-05932-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/1320a1c7df76/materials-17-05932-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/a783932c54ba/materials-17-05932-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/f647512e5afb/materials-17-05932-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/93f82ca37ba8/materials-17-05932-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/c2389743df4d/materials-17-05932-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/2d0719438c16/materials-17-05932-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/01b0f3229955/materials-17-05932-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/1f6cce9b130a/materials-17-05932-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/8a33876d68e1/materials-17-05932-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/596abf3ee144/materials-17-05932-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/1320a1c7df76/materials-17-05932-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/a783932c54ba/materials-17-05932-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/f647512e5afb/materials-17-05932-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/93f82ca37ba8/materials-17-05932-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ddeb/11642976/c2389743df4d/materials-17-05932-g010.jpg

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本文引用的文献

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Direct observation of chemical short-range order in a medium-entropy alloy.直接观察中熵合金中的化学短程有序。
Nature. 2021 Apr;592(7856):712-716. doi: 10.1038/s41586-021-03428-z. Epub 2021 Apr 28.
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Short-range order and its impact on the CrCoNi medium-entropy alloy.短程有序及其对 CrCoNi 中熵合金的影响。
Nature. 2020 May;581(7808):283-287. doi: 10.1038/s41586-020-2275-z. Epub 2020 May 20.
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