电池包用6061铝合金型材成分与挤压成型性关系

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

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。

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 nationalstandard 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)℃ 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.