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比较研究了Mg-(RE)-Zn合金铸态和经560℃扩散退火后的显微组织、物相及性能,发现铸态的Mg-(RE)-Zn合金经560℃保温7h扩散退火,原晶界区的共晶组织消失,晶界净化,材料成分和显微组织均匀,扩散退火的过程中合金的物相构成和分布均发生显著变化,由铸态下的Mg-(Me)固溶体+GdMg转变为均匀分布的Mg-(Me)固溶体+MgGd3+MgZn2,经扩散退火后的合金平均硬度、抗拉强度和延伸率均提高,单向拉伸断裂方式由铸态下的沿晶断裂转变为微孔聚集型的穿晶断裂。
The microstructure, phase and properties of Mg- (RE) -Zn alloy after as-cast and after 560 ℃ diffusion annealing were investigated. The as-cast Mg- (RE) -Zn alloy was diffused and annealed at 560 ℃ for 7h, The eutectic microstructure of the original grain boundary disappears, the grain boundaries are refined, the material composition and microstructure are uniform, and the phase composition and distribution of the alloy are changed significantly during the diffusion annealing. The as-cast Mg- (Me) solid solution + GdMg into uniform Mg- (Me) solid solution + MgGd3 + MgZn2, the average hardness of the alloy after the diffusion annealing increases the tensile strength and elongation, the uniaxial tensile fracture mode by as-cast intergranular fracture Into a microporous aggregate transgranular fracture.