Stress-Relaxation Behavior of Magnesium-3Gadolinium-2Calcium-Based Alloys at Elevated Temperatures

• DOI: 10.1007/s11661-017-4324-2
• Publication Date: 2017-09-14T16:25:05Z
• Authors: Ning Mo; Qiyang Tan; Bin Jiang; Fusheng Pan; Ming-Xing Zhang
• Keywords: 3104 Condensed Matter Physics; Creep Resistance; 2506 Metals and Alloys; Magnesium Alloys; 02 engineering and technology; Solution Heat-Treatment; Binary Mg Alloys; 2211 Mechanics of Materials; 0205 materials engineering; 669; Tensile Properties; Solute; Gd Alloys; Cast; Strength; Microstructure

Based on previously published work on binary Mg alloys by Abaspour et al. and on the magnesium (Mg)-6gadolinium (Gd)-2zinc (Zn)-0.6zirconium (Zr) (wt pct) alloy reported by Nie et al., a number of new lower-cost Mg-3Gd-2calcium (Ca) (wt pct)-based creep-resistant magnesium alloys were developed by replacing part of the Gd with Ca. After solution treatment at 793 K (520 °C), the Ca-containing alloys exhibited an increased strength and a reduced stress relaxation at 453 K (180 °C) compared with the Mg-6Gd-2Zn-0.6Zr (wt pct) alloy. This work indicates that the replacement of Gd with Ca is a promising approach to develop lower-cost Mg alloys with an improved creep resistance. The results support the hypothesis that the short-range order of solutes governs the creep behavior of magnesium alloys.