Table of Contents
Indian Journal of Materials Science
Volume 2015, Article ID 897686, 6 pages
http://dx.doi.org/10.1155/2015/897686
Research Article

Microstructure Evolution and Grain Growth Model of AZ31 Magnesium Alloy under Condition of Isothermal

1School of Material Science and Engineering, Shenyang Ligong University, Shenyang 110159, China
2Shenyang Institute of Technology, Liaoning, Fushun 113122, China
3Brilliance Auto R and D Center (BARC), Shenyang 110141, China

Received 8 October 2015; Revised 26 November 2015; Accepted 10 December 2015

Academic Editor: Pradeep Lancy Menezes

Copyright © 2015 Zhongtang Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Microstructure evolution of AZ31 magnesium alloy in annealing process had been investigated by experiment study at heating temperature range of 150°C–450°C and holding time range of 15 min–60 min. The effects of heating temperature and holding time on grain growth had been analyzed. The results presented that the grain size tends to grow up with the increase of holding time at a certain temperature. At a certain holding time, the grain size increased firstly and then decreased at the heating temperature range of 150–250°C. And when heating temperature is higher than 250°C, the grain grows up gradually with the increase of heating temperature. The grain growth model of AZ31 Mg alloy has been established by regression based on the experimental data at temperature of 250–450°C, and the relative error between model calculation results and experimental results is less than 19.07%. Activation energy of grain growth of AZ31 magnesium alloy had been determined.