挤压变形Al—0．8％Mg—0．6％Si—xSc合金的显微组织与力学性能

本文针对挤压变形Al—0．8％Mg—O．6％Si-xSc合金的显微组织和拉伸性能进行了研究，以确定稀土元素Sc和T6处理对该系合金性能的影响规律。结果表明，加入适量的元素Sc可以有效地细化挤压变形Al0．8％Mg-0．6％Si—xSc合金的组织，提高其室温抗拉强度、屈服强度和断裂伸长率；经过T6处理后，Al—08％Si-0．6％Si—xSc舍金的抗拉强度和屈服强度可得到显著提高；挤压变形Al—0．8％Mg～O．6％Si～xSc合金在拉伸加载条件下主要呈现韧性断裂特征。

Microstructure and Mechanical Properties of Extruded Al- 0.8 %Mg- 0.6 %Si- xSe Alloys

In order to determine the influence of rare element Sc and T6 treatment on the properties of the extruded Al-0. 8%Mg-0. 6%Si- xSe alloys, the mierostructures and tensile properties of these alloys were investigated. The results reveal that the addition of Se with appropriate content can not only effectively refine the grains of the extruded Al-0. 8%Mg-0.6% Si-xSc alloys, but also improve the ultimate tensile strength, yield strength and elongation to failure of the alloys at room temperature. The ultimate tensile strength and yield strength of the Al-0.8%Mg-0. 6%Si-xSc alloys get obviously enhanced after T6 treatment. In addition, under tensile loading condition, the extruded Al-0.8%Mg-0.6 %Si- xSc alloys mainly show typical ductile fracture characteristics.