铸造铝合金在铸态下的机械性能往往不能满足使用要求,通过热处理的办法可进一步提高铸件的机械性能和使用性能。热处理的目的大致有以下几个方面:(1)充分提高铸件的机械性能,保证一定的塑性,提高合金抗拉强度和硬度,改善合金的切削加工性能等;(2)消除由于铸件壁厚不均匀、快速 Casting aluminum in the as-cast mechanical properties often can not meet the requirements, through the heat treatment can further improve the mechanical properties of castings and performance. The purpose of heat treatment generally have the following aspects: (1) fully improve the mechanical properties of castings, to ensure a certain degree of plasticity, improve the tensile strength and hardness of alloys, improve the machinability of the alloy, etc .; (2) Even, fast