J. Mater. Sci. Technol. ›› 2021, Vol. 62: 70-82.DOI: 10.1016/j.jmst.2020.05.036

• Research Article • Previous Articles     Next Articles

Assessment of atomic mobilities and simulation of precipitation evolution in Mg-X (X=Al, Zn, Sn) alloys

Yuhui Zhanga, Yuling Liua, Shuhong Liua,*(), Hai-Lin Chenb, Qing Chenb, Shiyi Wena, Yong Dua   

  1. aNational Key Laboratory of Science and Technology for National Defense on High-strength Structural Materials, Central South University, Changsha 410083, China
    bThermo-Calc Software AB, R?sundav?gen 18, 16967 Solna, Sweden
  • Received:2020-03-05 Revised:2020-04-26 Accepted:2020-05-10 Published:2021-01-30 Online:2021-02-01
  • Contact: Shuhong Liu
  • About author:* E-mail address: shhliu@csu.edu.cn (S. Liu).

Abstract:

As potential cast and wrought Mg alloys, Mg-X (X=Al, Zn, Sn) based alloys have attracted great interest. This work is to develop a dataset of atomic mobilities that is valid over a wide composition range. With the obtained mobilities, and a compatible thermodynamic description, as well as thermophysical parameters, simulations are performed to predict the characteristics of precipitation evolution. Examples are presented for the isothermal aging processes in Mg-x wt.%Al (x = 5.9, 6, 8.8, 9), Mg-x wt.%Zn (x = 6, 6.2, 8, 8.65), Mg-x wt.%Sn (x = 6.04, 6.92, 8.64) alloys. The simulated size distribution, number density and volume fraction of precipitates reasonably account for the experimental results and provide additional information for further alloy composition design and heat treatment optimization.

Key words: Atomic mobility, Magnesium alloys, Precipitation, Alloy design