Title: Strains and microstructures of AZ61 magnesium alloy caused by different channel angles and preheated temperatures of extrusion-shear process

Authors: H-J. Hu; Y-Y. Li; Z. Sun

Addresses: College of Material Science and Engineering, Chongqing University of Technology, Chongqing, 400050, China ' College of Material Science and Engineering, Chongqing University of Technology, Chongqing, 400050, China ' College of Material Science and Engineering, Chongqing University of Technology, Chongqing, 400050, China

Abstract: Extrusion-shear (ES), a method having the potentiality of obtaining fine microstructures of magnesium alloys, has been studied to refine grains of AZ61 magnesium alloy. During ES process, the channel angles and preheated temperatures play a critical part in the deformation behaviours of magnesium alloy. Thus, the effects of their effect on the strain distributions and microstructures evolutions in AZ61 magnesium alloy during ES process have been studied using simulation and experiments. The strains in the extruded rods during ES process with different channel angles have been obtained by simulation using three-dimensional (3D) geometric models and finite elements simulations of ES processes. Then, ES processes were conducted to prepare the samples of AZ61 magnesium alloy. With the microstructures evolvements observed, it is found that the strains of ES process decrease with the increasing of the channel angles and they increase with the increasing of preheated temperatures. Smaller channel angles and bigger preheated temperatures could improve the refinements of magnesium alloys.

Keywords: AZ61 magnesium alloys; microstructure; channel angles; preheated temperature; extrusion-shear process; strain distribution; simulation; 3D modelling; finite element method; FEM.

DOI: 10.1504/IJCMSSE.2016.081682

International Journal of Computational Materials Science and Surface Engineering, 2016 Vol.6 No.3/4, pp.186 - 196

Received: 03 Jan 2015
Accepted: 12 Oct 2015
Published online: 20 Jan 2017 *

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