A Multi-scale Model for Elucidation of Recrystallization and Texture of Mg-Alloy Sheet by Warm-rolling Process

doi:10.11901/1005.3093.2020.372

Chinese Journal of Materials Research

2021, Vol. 35

Issue (5): 339-348 DOI: 10.11901/1005.3093.2020.372

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A Multi-scale Model for Elucidation of Recrystallization and Texture of Mg-Alloy Sheet by Warm-rolling Process

SUN He¹^,², CHEN Ming¹^,²(

), CHENG Ming³, WANG Ruixue³, WANG Xu¹^,², HU Xiaodong², ZHAO Hongyang², JU Dongying²^,⁴

^1.School of Mechanical Engineering and Automation, University of Science and Technology Liaoning, Anshan 114051, China
^2.Research Center of Magnesium Alloy Casting and Rolling Technology, University of Science and Technology Liaoning, Anshan 114051, China
^3.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^4.Saitama Institute of Technology, Saitama 3690293, Japan

Cite this article:

SUN He, CHEN Ming, CHENG Ming, WANG Ruixue, WANG Xu, HU Xiaodong, ZHAO Hongyang, JU Dongying. A Multi-scale Model for Elucidation of Recrystallization and Texture of Mg-Alloy Sheet by Warm-rolling Process. Chinese Journal of Materials Research, 2021, 35(5): 339-348.

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Abstract

The mechanism of recrystallization and texture evolution of Mg-alloy sheet was elucidated by means of an established multi-scale calculation model. First of all, the numerical calculation of asymmetric warm-rolling process was carried out by using finite element method, and the equivalent plastic strain and strain rate were obtained as the reference boundary parameters conditions. By introducing the hardening equation based on dislocation density evolution, the coupling calculation of the viscoplastic self-consistent (VPSC) model and cellular automata (CA) model were achieved. The stress and strain, as well as the dynamic recrystallization microstructure and deformation texture on the microscopic scale were obtained. Based on this method, the influence of strain rate on dynamic recrystallization microstructure variation during asymmetric warm-rolling was calculated. The microstructure of warm-rolled AZ31 Mg-alloy sheet prepared by different cooling conditions was experimentally verified by electron back-scattered diffraction (EBSD). The simulation results show that the grain can be refined by increasing the strain rate appropriately and the experimental results show that the weakening degree of the basal texture of the alloy sheet by air cooling after rolling is higher, which is beneficial to the enhancement of the deformation ability of the Mg-alloy sheet along its thickness.

Key words: metallic materials multi-scale model asymmetric warm-rolling dislocation density Visco-Plastic Self-Consistent model dynamic recrystallization

Received: 04 September 2020

ZTFLH:

TG146

Fund: National Natural Science Foundation of China Youth Science Foundation Project(51305188);Liaoning Provincial Department of Science and Technology Doctor Initiated the Project(20170520313)

About author: CHEN Ming, Tel: 13478045992, E-mail: chenming@ustl.edu.cn

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	He SUN
	Ming CHEN
	Ming CHENG
	Ruixue WANG
	Xu WANG
	Xiaodong HU
	Hongyang ZHAO
	Dongying JU

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.372 OR https://www.cjmr.org/EN/Y2021/V35/I5/339

Fig.1 Six-high warm-rolling mill

Table 1 Material parameters in finite element simulation of AZ31 magnesium alloy

Fig.2 Finite element simulation calculation flow chart

Fig.3 FEM-CA Schematic diagram

Fig.4 Schematic diagram of equivalent plastic strain point location

Fig.5 Macroscopic plastic strain - yield stress curve

Fig.6 Relative activity of Slip and twinning

Table 2 Voce hardening parameter of Visco-Plastic Self-Consistent model

Table 3 Physical parameters of dynamic recrystallization simulation of AZ31 magnesium alloy

Fig.7 VPSC-DRX model flowchart based on dislocation density evolution

Fig.8 Recrystallization of AZ31 magnesium alloy simulates the microstructure of different strain (a) $? ε = 0.24$ ; (b) $ε = 0.30$ ; (c) $ε = 0.36$ ; (d) $? ε = 0.42$

Fig.9 Microstructure of AZ31 magnesium alloy with different strain rate was simulated by recrystallization (a) $? ε ˙ = 0.001$ ; (b) $ε ˙ = 0.01$ ; (c) $? ε ˙ = 0.05$

Fig.10 Schematic diagram of sheet rolling direction

Fig.11 Microstructure of AZ31 magnesium alloy sheet under different treatment (a) rolling state (simulated result); (b) initial state (experimental result); (c) water-cooling treatment (experimental result); (d) air-cooling treatment (experimental result)

Fig.12 Misorientation angle distribution of AZ31 magnesium alloy sheet (a) initial state; (b) water-cooling treatment; (c) air-cooling treatment

Fig.13 Pole figure of different treatment methods for AZ31 magnesium alloy sheet (a) VPSC simulation result; (b) initial state; (c) water-cooling treatment; (d) air-cooling treatment

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