Mechanical Properties and Creep Behavior of Mg-Gd-Y-Zr Alloys

Abstract

The microstructure, mechanical properties and creep behavior of Mg-Gd-Y-Zr alloys at different temperatures and stresses have been investigated. Results show that the tensile properties and creep resistance at T6 condition is much higher than that at as-cast condition. The creep resistance of Mg-Gd-Y-Zr alloy at 250°C/80MPa is markedly better than that at 300°C/50MPa, indicating that temperature makes more effects on the creep resistance than the stress.

Effects of rare-earth elements Gd and Y on the solid solution strengthening of Mg alloys

“…To improve the mechanical properties of Mg alloy, Mg-RE (rare-earth elements, such as Gd, Y, Ce, Nd, misch metal, etc.) alloys have been given tremendous attention due to their high specific strength at both room and elevated temperatures as well as their excellent creep resistance [1,3,6,7,9,12]. Among them, Mg-Gd-Y system is one of the promising candidates for a novel Mg-based age hardenable alloy.…”

“…Magnesium alloys have great potential to be used as structural materials because they are the lightest among all the structural alloys in use [1][2][3][4][5][6][7][8][9][10][11][12]. Compared with aluminum alloys, however, the strength of magnesium alloys is still relatively low which limits their extensive application.…”

Investigation on low cycle fatigue behaviours of Mg-12Gd-3Y-0.5Zr magnesium alloy

“…The second phase whose constituent is approately Mg 24 (Gd,Y) 5 [5] was precipitated in microstructre in the process of extrusion.…”

Research on mechanical properties and thermo-mechanical fatigue behaviours of Mg-12Gd-3Y-0.5Zr magnesium alloy at elevated temperatures

“…The second phase whose constituent is approately Mg 24 (Gd,Y) 5 [3] was precipitated in microstructre in the process of extrusion.…”

“…Tensile specimens were cut by electric spark machining along the rolling direction with a gauge sections of 3mm×1.4mm×1mm 3 . Tensile tests were carried out on an Instron 8801 testing machine equipped with a heater and temperature controlling system at room temperature, 130, 170, 200 and 235 o C and at a initial strain rate of 1×10 -3 s -1 .…”