通过对铸造铝合金 RR35 0显微组织、分布状态、合金相特性及显微硬度的分析 ,研究了含镍合金相在使用过程中所起的不同强化机理及作用。试验表明 :铸造铝合金经固溶时效后 ,会形成许多含镍合金相 ,并且随加热温度提高 ,硬度会有极值存在。RR35 0铸造铝合金中含镍相存在会提高热强性 By analyzing the microstructure, distribution, phase characteristics and microhardness of the cast aluminum alloy RR35 0, the different strengthening mechanisms and functions of the alloy containing nickel during its use were studied. Experiments show that: Casting aluminum after solution aging, the formation of many nickel-containing alloy phase, and with the heating temperature increases, there will be an extreme hardness. The presence of a nickel-containing phase in the RR35 0 cast aluminum alloy increases the thermal strength