Transactions of Materials and Heat Treatment

Title：Constitutive equation on AlCoCrFeNi0.6 high entropy alloy based on double multiple nonlinear regression model

Authors： Liu Taiying1 Han Yingying2 Wang Lei3

Unit： (1.Beijing Xinghang Electro-mechnical Equipment Co. Ltd. Beijing 100074 China 2.Beijing Power Machinery Research Institute Beijing 100072 China 3.Zhejiang Hangzhou Zhengcai Holding Group Co. Ltd. Hangzhou 310000 China)

KeyWords： high entropy alloy rheological characteristics constitutive equation DMNR model flow stress

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2023,48(6):258-264

Abstract：

The hot compression test of AlCoCrFeNi0.6 high entropy alloy was carried out by hot compression machinery Gleeble-3500 at test temperatures of 1223, 1273, 1323 and 1373 K and strain rates of 0.001, 0.01, 0.1 and 1 s-1, and the relationship between flow stress σ and strain ε, temperature T and strain rate ε· was explored. Then, the constitutive equation based on the double multipe nonlinear regression (DMNR) model was established. The results show that under the same strain rate, with the increasing of temperature, the flow stress shows a downward trend, and under the same temperature condition, the flow stress shows an increases trend with the increasing of strain rate. Therefore,AlCoCrFeNi0.6 high entropy alloy has obvious strain rate strengthening and high temperature softening phenomenon. Based on double multiple nonlinear regression (DMNR) model, the high-temperature constitutive equation of AlCoCrFeNi0.6 high entropy alloy is established. Through comparative analysis, it is found that the established model has good prediction performance, and the average relative error is 9.94%.

Funds：

国防科技173计划技术领域基金（2021-JCJQ-JJ-0197）

刘太盈（1987-），男，硕士，工程师

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