Effect of elastic strain energy on grain growth and texture in AZ31 magnesium alloy by phase-field simulation

doi:10.1088/1674-1056/26/12/128201

Abstract A phase-field model is modified to investigate the grain growth and texture evolution in AZ31 magnesium alloy during stressing at elevated temperatures. The order parameters are defined to represent a physical variable of grain orientation in terms of three angles in spatial coordinates so that the grain volume of different order parameters can be used to indicate the texture of the alloy. The stiffness tensors for different grains are different because of elastic anisotropy of the magnesium lattice. The tensor is defined by transforming the standard stiffness tensor according to the angle between the (0001) plane of a grain and the direction of applied stress. Therefore, different grains contribute to different amounts of work under applied stress. The simulation results are well-explained by using the limited experimental data available, and the texture results are in good agreement with the experimental observations. The simulation results reveal that the applied stress strongly influences AZ31 alloy grain growth and that the grain-growth rate increases with the applied stress increasing, particularly when the stress is less than 400 MPa. A parameter (△d) is introduced to characterize the degree of grain-size variation due to abnormal grain growth; the △d increases with applied stress increasing and becomes considerably large only when the stress is greater than 800 MPa. Moreover, the applied stress also results in an intensive texture of the 〈0001〉 axis parallel to the direction of compressive stress in AZ31 alloy after growing at elevated temperatures, only when the applied stress is greater than 500 MPa.

Keywords: phase-field simulation elastic energy texture magnesium alloy

Received: 15 May 2017
Revised: 18 July 2017
Accepted manuscript online:

PACS:	82.20.Wt	(Computational modeling; simulation)
	91.60.Ed	(Crystal structure and defects, microstructure)
	81.40.Jj	(Elasticity and anelasticity, stress-strain relations)
	68.55.jm	(Texture)

Fund: Project supported by the National Key Research Development Program of China (Grant No. 2016YFB0701204) and the National Natural Science Foundation of China (Grant Nos. U1302272 and 51571055).

Corresponding Authors: Ming-Tao Wang
E-mail: wangmingtao@mail.neu.edu.cn

Cite this article:

Ri He(何日), Ming-Tao Wang(王明涛), Jian-Feng Jin(金剑锋), Ya-Ping Zong(宗亚平) Effect of elastic strain energy on grain growth and texture in AZ31 magnesium alloy by phase-field simulation 2017 Chin. Phys. B 26 128201

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Effect of elastic strain energy on grain growth and texture in AZ31 magnesium alloy by phase-field simulation

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