|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Magnesium Technology 2017
||Microstructure and Mechanical Properties of an Extruded Mg-1.58Zn-0.52Gd Alloy
||M.G. Jiang, J.C. Chen, H. Yan, C. Xu, T. Nakata, S. Kamado
|On-Site Speaker (Planned)
Mg-1.58Zn-0.52Gd (wt.%) alloy was indirectly extruded at different temperatures and the resulting microstructure, texture and mechanical properties were investigated. The alloy extruded at 350 ℃ exhibited a typical bimodal microstructure, consisting of fine dynamically recrystallized (DRXed) grains of 3.1 μm and coarse unDRXed grains, with high density of fine spherical Mg3Zn3Gd2 phase, and a strong [10-10] fiber texture, thereby resulting in high yield strength of 283 MPa and low elongation of 10.0%. With increasing extrusion temperature, the yield strength gradually decreased with an increase in DRXed grain size according to the Hall-Petch relation, while the elongation increased due to the decreased unDRX fraction, suppressing crack initiation at twins in coarse unDRXed grains, and weakened basal texture. As a result, the alloy extruded at 400 ℃ showed yield strength of 161 MPa and elongation of 24.7%.