Abstract
A crystal plasticity constitutive model of high-entropy alloys (HEAs) coupled with damage evolution equation at high temperature is developed. To simulate the degraded load-carrying capacity of HEAs caused by microdefects, a phenomenological damage evolution equation is proposed based on the compression experiments at different temperatures. The established model is used to simulate the stress softening phenomenon of polycrystalline AlCrCuFeNi-based HEAs, which is highly dependent on the strain rate and temperature. Compared with the experimental data, the proposed model is able to accurately describe the stress-strain relationship of HEAs.
摘要
本文建立了高熵合金在高温下耦合损伤的晶体塑性本构模型. 为了模拟微缺陷引起的高熵合金承载力下降的现象, 提出一个基于压缩试验数据的唯象损伤演化方程. 开发的本构模型被用于模拟AlCrCuFeNi基的多晶高熵合金的应力软化现象, 且可以描述高熵合金变形的温度和率相关性. 将模拟结果与试验数据对比, 该模型能够准确描述高熵合金的应力-应变关系.
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Acknowledgements
This work was supported by the Shaanxi Science and Technology Innovation Team (Grant No. 2022TD-05), Shaanxi “Sanqin Scholar” Innovation Team, and the Natural Science Basic Research Plan in Shaanxi Province of China (Grant No. 2021JQ-077).
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Yingying Wang and Jundong Wang developed the constitutive model and wrote the first draft of manuscript. Mingqi Lei developed the 2D polycrystalline finite element model. Yao Yao proposed the idea, supervised the research, and revised the manuscript.
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Wang, Y., Wang, J., Lei, M. et al. A crystal plasticity coupled damage constitutive model of high entropy alloys at high temperature. Acta Mech. Sin. 38, 122116 (2022). https://doi.org/10.1007/s10409-022-22116-x
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DOI: https://doi.org/10.1007/s10409-022-22116-x