Metallurgical Abstracts on Light Metals and Alloys vol.56

High temperature creep deformation behavior of heat-treated (α+β)-Mg-9Li-4Al-1Zn alloy

Takahiro Mineta*, Haruto Saijo* and Hiroyuki Sato*
* Department of Mechanical Science and Engineering, Graduate School of Science and Technology, Hirosaki University

[Published in Journal of Alloys and Compounds, Vol. 910 (2022), 164938]

https://doi.org/10.1016/j.jallcom.2022.164938
E-mail: mineta[at]hirosaki-u.ac.jp
Key Words: Magnesium alloys, Creep, Heat treatment, Stress exponent, Activation energy

In this study, the high temperature uniaxial tensile creep deformation behavior of (α + β)-Mg-9 mass%Li-4 mass%Al-1 mass%Zn (LAZ941) alloy was investigated. The creep strength of the LAZ941 alloy was significantly improved by heat treatment. The creep deformation behavior of the heat-treated LAZ941 alloy was unique. As the results of creep tests, it is found that the stress exponent of LAZ941 was about 3. The activation energies of creep at the early and middle stages of deformation were 114.7 and 84.6 kJ●mol^-1, respectively, indicating that the diffusing elements controlling the viscous glide of the dislocation changed during creep deformation.

The typical creep curves of the duplex LAZ941 alloy before and after heat treatment.