电池包用6061铝合金型材成分与挤压成型性关系

由于现有6061铝合金挤压成型性及力学性能较差，在实际生产中应用范围受限，通过改变合金成分开发新型6061铝合金，将Si的质量分数调整至国标上限0.73%～0.80%，Mg的质量分数调整至国标下限0.82%～0.90%，同时分别设计了多细晶元素（Mn+Cr的质量分数为0.40%）与少细晶元素（Mn+Cr的质量分数为0.14%）两种配比方式，分别命名为6061-A铝合金和6061-B铝合金。通过观察微观组织、测试力学性能、调整挤压速度，研究6061-A铝合金和6061-B铝合金的力学性能、挤压成型性。结果表明，6061-A铝合金挤压成型性更好，同时经（175±5）℃×8 h热处理后，型材屈服强度达到312 MPa，抗拉强度达到325 MPa，伸长率为9%，均高于标准要求。

Relationship between composition and extrusion formability of 6061 aluminum alloy profiles for battery packs

Due to the poor extrusion formability and mechanical properties of the existing 6061 aluminum alloy, its application scope in practical production is limited. By changing the alloy composition to develop a new 6061 aluminum alloy, the mass fraction of Si was adjusted to the of the national-standard upper limit of 0.73%-0.80%, and the mass fraction of Mg was adjusted to the national-standard lower limit of 0.82%-0.90%. At the same time, two proportioning methods were designed, which were high fine-grained elements (Mn+Cr mass fraction of 0.40%) and low fine-grained elements (Mn+Cr mass fraction of 0.14%), and named as 6061-A aluminum alloy and 6061-B aluminum alloy, respectively. By observing microstructure, testing mechanical properties, and adjusting extrusion speed, the mechanical properties and extrusion formability of 6061-A and 6061-B aluminum alloys were studied. The results show that the 6061-A aluminum alloy has better extrusion formability, and after the heat treatment at (175 ± 5) °C for 8 h, the yield strength of the profile reach 312 MPa, the tensile strength reach 325 MPa, and the elongation rate is 9%, which are all higher than the standard requirements.