摘要
针对单相FCC高熵合金,开发一个基于物理背景的温度相关性屈服强度模型,该模型无拟合参数。模型考虑晶格摩擦应力、固溶强化、晶界强化、位错强化的温度相关性及其随温度的演化对合金整体屈服强度的影响。结果表明,模型成功地捕获温度、材料参数和屈服强度之间的定量关系。仅通过使用在室温下容易获得的参数就可预测不同温度下合金的屈服强度。在宽温度范围(4.2~1273 K)内,可获取的17组实验数据验证了模型的准确性。此外,还定量分析和讨论4.2~1273 K范围内不同强化机制对屈服强度的贡献,提出提高温度相关性屈服强度的建议。
A physics-based temperature-dependent yield strength model without fitting parameters was developed for single-phase FCC high-entropy alloys.The model considered the temperature dependence of lattice friction stress,solid solution strengthening,grain boundary strengthening,dislocation strengthening,and their evolution with temperature to the overall yield strength.The results show that a quantitative relationship between temperature,material parameters,and yield strength was successfully captured by the model.This model can predict the yield strength at different temperatures only by using the easily available material parameters at room temperature.The accuracy of model was well verified by 17 sets of available experimental data over a wide temperature range(4.2-1273 K).Moreover,the contribution of different strengthening mechanisms to the yield strength was quantitatively analyzed and discussed from 4.2 to 1273 K,and some suggestions for improving the temperature-dependent yield strength were put forward.
作者
贺屹
李卫国
皮文丽
杨梦卿
董攀
张志清
Yi HE;Wei-guo LI;Wen-li PI;Meng-qing YANG;Pan DONG;Zhi-qing ZHANG(State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;College of Aerospace Engineering,Chongqing University,Chongqing 400044,China;College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China)
基金
the National Natural Science Foundation of China(No.11672050)
the Fundamental Research Funds for the Central Universities of China(No.2019CDQYHK016)。
关键词
单相面心立方高熵合金
温度相关性屈服强度
强化机理
理论模型
single-phase FCC high-entropy alloys
temperature-dependent yield strength
strengthening mechanism
theoretical model
