【摘要】 为了确定稀土元素Ce在Al-Mg系合金中的作用,向Al-4%Mg合金中加入不同含量的Ce,研究了Ce对合金显微组织和力学性能的影响。显微组织观察结果表明,加入0.3%～1.0%的Ce不仅可细化Al-4%Mg系合金的晶粒,同时也可改变合金中析出相的类型。拉伸试验结果表明,随着Ce的加入,挤压变形Al-4%Mg系合金的室温抗拉强度和屈服强度均有所提高,其中当Ce的加入量为0.6%时,合金的强度最高,与未添加稀土元素的Al-4%Mg合金相比,可使抗拉强度提高近20%,屈服强度提高约16%。室温拉伸断口的SEM分析结果表明,挤压变形Al-4%Mg系合金均表现出典型的韧性断裂特征。更多还原

【Abstract】 In order to understand fully the function of rare earth Ce in the Al-Mg alloys, the influence of Ce on the microstructures and tensile properties of the alloys has been investigated through adding different content of Ce in the Al-Mg alloys. The observations on the microstructures indicate that the addition of Ce with different contents ranging from 0.3% to 1.0% can effectively refine grains, and lead to the precipitation of Al4Ce phase. The results of the tensile experiments show that with the addition of Ce, the ultimate tensile strength and yield strength of the extruded Al-4%Mg alloys are significantly enhanced. Especially when Ce of 0.6% is added, the alloy can give the highest ultimate tensile strength and yield strength. The ultimate tensile strength of the alloy increases by about 20%, and the yield strength by about 16% compared to those of alloy without Ce addition. The analysis of the tensile fracture surfaces reveals that the extruded Al-4%Mg alloys with and without the addition of Ce exhibit the typical ductile fracture characteristic.更多还原