Effect of Zn concentration on the microstructures and mechanical properties of extruded Mg–7Y–4Gd–0.4Zr alloys

Influence of Zn content on the microstructure and mechanical properties of extruded Mg–5Y–4Gd–0.4Zr alloy

“…It has been reported that the 18R LPS structure formed, located at the grain boundaries which were rich in Y and Zn, in the Mg-Zn-Y RS alloy ribbons or cast alloy ingots as secondary phase [11,12]. Furthermore, it has been reported that the 18R LPS structure was not stable during heat treatment at 500 • C, and transformed to 14H LPS structure when the cast alloys were heat treated for more than 5 h at 500 • C. However, the 14H LPS structures were not developed during casting and ageing at low temperature in the Mg-Zn-Y alloys [10].…”

Microstructural stability and grain growth kinetics in an extruded fine-grained Mg–Gd–Y–Zr alloy

“…In addition, there are limitations associated with heating simple magnesium alloys to high temperatures because the microstructures of fine-grained alloys tend to be unstable and exhibit extensive grain growth. Attempts have been made to improve their thermal stability by the addition of different alloying elements and in this respect it was reported that the addition of gadolinium (Gd) and other rare earth (RE) elements leads to a remarkable improvement in the mechanical properties at high temperatures due to solution and precipitation hardening [2][3][4][5].…”

Microstructures and mechanical properties of the extruded Mg-4Y-2Gd-xZn-0.4Zr alloys

“…The LPS structure has been observed in the Mg-Zn-RE (RE containing Y, Gd, Ce, Sm, La and La(MM)), and the formation of this LPS structure is a universal phenomenon [15][16][17][18]. In our previous work, the LPS structure had been observed in the Mg-Zn-Y-Gd-Zr and Mg-Zn-Gd-Zr series alloys, and these investigations suggested that this structure has a great effect on improving mechanical properties, including tensile strength and elongation [4,5,10,12].…”

“…However, the present commercial magnesium alloys display disappointing mechanical properties. Zn is often added to improve both the yield tensile strength (YTS) and the ductility of the wrought magnesium alloys [2][3][4][5][6][7]. Kawamura et al [8] have developed a RS P/M Mg-1Zn-2Y (at.%) alloy, and this alloy shows excellent mechanical properties.…”