The invention relates to a heat-treatment-free high-strength cast aluminum alloy and a preparation method and application thereof. The aluminum alloy comprises the following components in percentage by weight: 7.0% to 8.5% of Si, 0.7% to 1.0% of Mn, 0.5% to 0.7% of Mg, 0.09% to 0.15% of Cr, 0.01% to 0.15% of Zr, 0.05% to 0.1% of Ti, 0.05% to 0.09% of Sr, 0.05% to 0.1% of Cu, 0.02% to 0.04% of Sc and the balance of Al and inevitable impurities, and the total amount of the impurities is not more than 1.0%. The aluminum alloy has the excellent mechanical properties that the yield strength in the die-casting state is larger than 180 MPa, and the elongation is larger than 10%, the performance requirement of the automobile body die-casting structural part can be met without subsequent heat treatment, the aluminum alloy is suitable for producing large thin-wall die-casting structural parts, the percent of pass of thin-wall die-casting structural part products can be greatly increased, and the use cost of automobile parts is reduced.
本发明为一种免热处理高强铸造铝合金及其制备方法和应用。所述铝合金的组分包括:Si 7.0~8.5wt.%,Mn 0.7~1.0wt.%,Mg 0.5~0.7wt.%,Cr 0.09~0.15wt.%,Zr 0.01~0.15wt.%,Ti0.05~0.1wt.%,Sr 0.05~0.09wt.%,Cu 0.05~0.1wt.%,Sc 0.02~0.04wt.%,其余为Al和不可避免的杂质,且杂质的总量不大于1.0wt.%。本发明具有压铸态屈服强度大于180MPa,伸长率大于10%的优异力学性能,无需进行后续热处理即可满足车身压铸结构件的性能要求,适用于生产大型薄壁压铸结构件,可大幅提升薄壁压铸结构件产品的合格率,降低汽车零件使用成本。
Heat-treatment-free high-strength cast aluminum alloy as well as preparation method and application thereof
一种免热处理高强铸造铝合金及其制备方法和应用
2024-05-24
Patent
Electronic Resource
Chinese
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