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研究7A04-H112铝合金经一次扩挤变形后的显微组织和力学性能。结果表明:相对于原始态试样,一道次挤压后试样的晶粒呈条状结构分布,抗拉强度和伸长率各提升57%和22.4%;二道次后试样的晶粒呈纤维状结构,各性能也均有不同程度的提升。可见,随着挤压道次的增加,晶粒变得更加纤细,力学性能提升,并且等效应变在变形中分布比较均匀,在不同道次变形中逐渐积累。
The microstructure and mechanical properties of 7A04-H112 aluminum alloy after first expansion and extrusion were studied. The results show that the tensile strength and elongation increase by 57% and 22.4%, respectively, compared with that of the original sample. The grains of the sample after two passes show the stripe structure distribution, and the tensile strength and elongation increase by 57% and 22.4% Fibrous structure, the performance also have different degrees of improvement. It can be seen that with the increase of extrusion pass, the grains become more slender and the mechanical properties are improved. The equivalent strain is more evenly distributed in the deformation and gradually accumulates in the deformation of different passes.