1.一种高压铸造用铝合金,其特征在于:其组成按重量百分比包括有,4.5-7.5%的硅,0.5-1.0%的铜,0.5-1.0%的镁,0.3-1.0%的铁,0.3-0.5%的锌,0.3-0.5%的锰,0.3-0.5%的镍,0.13-0.15%的锶,0.1-0.3%的钴,0.001-0.003%的钛,小于0.003%的硼,余量为铝。
2.根据权利要求1所述的高压铸造用铝合金,其特征在于:其组成按重量百分比包括有,5.0-6.5%的硅,0.5-0.8%的铜,0.8-1.0%的镁,0.3-0.5%的铁,0.3-0.5%的锌,0.3-0.5%的锰,0.3-0.5%的镍,0.13-0.15%的锶,0.1-0.3%的钴,0.001-0.003%的钛,小于0.003%的硼,余量为铝。