【摘要】 研究了热处理工艺对Mg-Nd-Gd-Zn-Zr稀土镁合金组织和性能的影响。结果表明,随固溶温度提高,晶粒长大明显,材料的伸长率降低,但第二相数量减少,材料断裂方式由第二相开裂和穿晶断裂相结合的方式转为穿晶解理断裂;固溶时间延长,材料的抗拉强度变化不大,伸长率有所提高,但材料内部含氧量增加,氧化程度加剧;采用分级时效可以提高材料的伸长率,但抗拉强度有所下降。更多还原

【Abstract】 The influence of heat treatment process on the microstructure and property of Mg-Nd-Gd-Zn-Zr magnesium alloy was studied.The results show that,with the increase of the solid solution temperature,the grains of the alloy grow obviously and its elongation rate is decreased,but the residual second phase in grain boundary reduces,and the fracture mode of the alloy changes from a combination of second-phase fracture and trans-grain fracture to the trans-grain cleavage fracture;with the increase of solution time,the change of the tensile strength is not evident and the elongation rate is increased,but oxidation extent tends to increasing;the double-stage ageing process can improve the elongation rate,but the tensile strength is lowered to some extent.更多还原