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采用冷压法压实Mg-Zn-Y-Zr合金碎屑,在不同温度和不同挤压比下进行热挤压。结果表明:在低于320℃时挤压,微观组织由大量再结晶晶粒和少量未再结晶晶粒组成,合金具有较高的强度和较低的韧性;当挤压温度升高到360℃时,发生完全再结晶,微观组织由等轴晶组成,合金具有较低的强度和较高的韧性;当挤压温度升高到420℃时,微观组织由粗大的等轴晶组成,导致了合金的力学性能下降;当挤压比从8增加到16时,晶粒明显细化,力学性能显著提高,然而,随着挤压比的进一步增加,屈服强度和极限抗拉强度升高幅度不大。
The cold-pressed Mg-Zn-Y-Zr alloy crumbs were compacted and hot-pressed at different temperatures and different extrusion ratios. The results show that when extruded below 320 ℃, the microstructure consists of a large number of recrystallized grains and a few non-recrystallized grains. The alloy has higher strength and lower toughness. When the extrusion temperature is raised to 360 ℃ , Complete recrystallization occurs and the microstructure consists of equiaxed grains. The alloy has lower strength and higher toughness. When the extrusion temperature is raised to 420 ℃, the microstructure consists of coarse equiaxed grains, resulting in The mechanical properties of the alloy decreased; when the extrusion ratio increased from 8 to 16, the grain refinement significantly improved mechanical properties significantly increased, however, as the extrusion ratio further increased, the yield strength and ultimate tensile strength increase is not Big.