Influence of texture and grain size on the room-temperature ductility and tensile behavior in a Mg–Gd–Zn alloy processed by rolling and forging

Microstructure and mechanical properties of ARB processed Mg-3% Gd alloy

“…It is known that grain growth in Mg alloys is rapid when the ARB temperature is higher than 0.5Tm (the melting point) or 461K or 188℃, thus the repeated heating at 400℃ between rolling cycles is above the recrystallization temperature of magnesium can result in static recrystallization and partially eliminate the accumulated strain. It has found that the interval reheating of pure Mg can lead to full recrystallization and a large grain size [9,11]. In this study, the intermediate annealing leads to saturation of hardening already after one cycle.…”

“…%Gd with an average grain size of 76µm after solute treatment at 535℃ for 1.5 hours are 71MPa and 13%, respectively [10]. For an MgGd-Zn alloy with similar compositions (3%Gd, 1%Zn), the highest yield strength of 143MPa and elongation of 30% were obtained after warm rolling at 430℃ to 85% reduction and annealing at 350℃ [11]. Therefore, the combination of strength and elongation of the present Mg-3%Gd alloy is greatly improved by ARB processing and subsequent annealing.…”

Ductility drop of the solutionized Mg-Gd-Y-Zr alloy during tensile deformation at 350 °C

“…It elucidates that after solid solution treatment, the coarse eutectic phases along grain boundaries in as-cast specimen were completely dissolved into magnesium matrix; meanwhile the grain size grew up to ~237 µm. The grain size was measured by the linear intercept method using the equation d = 1.74 L, where L is the linear intercept grain size determined by optical microscopy [21]. In addition, it is interesting to find that there were some dark dots existed in Fig.…”

Property improvements in fine–grained Mg–Zn–Zr alloy sheets produced by temperature–step–down multi–pass rolling

“…As reported in our previous work [5] showed that the, uniform strain in Mg alloys increases as the intensity of basal texture weakens perpendicular to tensile direction in a wider grain sizes of 2.5e12 mm. Additionally, twinning deformation involved in Mg alloys may be not conducive to the development of postenecking elongation and can be well suppressed by fine grains and precipitates [5,27,34]. Unfortunately, an intense {0002} basal texture bad for uniform elongation gradually was developed during rolling.…”