|About this Abstract
||2012 TMS Annual Meeting & Exhibition
||Magnesium Technology 2012
||K-12: Effect of Zn Concentration on the Microstructures and Mechanical Properties of Extruded Mg–Y–Gd–Zr Alloys
||Jian Meng, Ke Liu, Xin Qiu, Deping Zhang, Yangde Li
|On-Site Speaker (Planned)
In this article, Microstructures and mechanical properties of the Mg–7Y–4Gd–xZn–0.4Zr (x = 0.5, 1.5, 3, and 5 wt.%) alloys in the as-cast, as-extruded, and peak-aged conditions have been investigated by using optical microscopy, scanning electron microscope, X-ray diffraction, and transmission electron microscopy. It is found that the peak-aged Mg–7Y–4Gd–1.5Zn–0.4Zr alloys have the highest strength after aging at 220°C. The highest ultimate tensile strength and yield tensile strength are 418 and 320 MPa, respectively. The addition of 1.5 wt.% Zn to the based alloys results in a greater aging effect and better mechanical properties at both room and elevated temperatures. The improved mechanical properties are mainly ascribed to both a fine β’ phase and a long periodic stacking-ordered structure, which coexist together in the peak-aged alloys.
||Definite: A combination print-CD volume