液态与半固态A380铝合金压铸件热处理前后组织性能的研究

Microstructure and mechanical properties of A380 aluminum alloy by liquid and semi-solid die casting processes

对A380铝合金液态与半固态压铸成形件在压铸态和T6热处理态下的力学性能与微观组织进行了研究.力学性能测试结果表明,两种不同成形方法所得的成形件在压铸态时强度相差不大,但半固态成形件的塑性几乎是液态成形件的2倍.经T6热处理后,半固态压铸件的抗拉强度有所提高,液态压铸件的抗拉强度却下降很大;两者的延伸率均有所下降,其中液态压铸件的延伸率下降幅度较大.微观组织研究结果表明,半固态压铸成形件适合进行热处理.

The microstructure and mechanical properties of the products made of A380 aluminum alloy by the two different forming methods （semi-solid casting and liquid die casting） with the state of casting and T6 heat-treatment have been studied. Mechanical properties test showed that the two products exhibited similar tensile strength before heat treatment. However, the ductility of the semi-solid forming parts was almost one time higher than that of liquid forming parts. After T6 heat treatment, the tensile strength of the semi-solid die casting parts increased slightly, while it decreased dramatically for the liquid die casting parts. The ductility of two products decreased with different variation range. Further investigation of microstructure showed that the heat treatment was good for the semi-solid castings.