新型高强Al-Mg-Si合金热处理工艺

结合力学性能测试、扫描电镜分析、DSC热差分析和金相组织观察,对一种新型高强Al-Mg-Si合金挤压材的固溶与时效制度进行了系统研究.同时得到了该合金挤压材不同时效温度下的力学性能,为工厂实际生产中热处理规程的制定以及深入研究提供详细的参考依据.该挤压材过烧温度572℃,熔化温度为594℃;对其进行560℃/2h固溶处理后,以及170℃/12 h人工时效热处理,可达到最佳峰值时效效果,其抗拉强度、屈服强度和延伸率可依次达到406,340 MPa和18.37%;该合金挤压材发生了充分的再结晶,致使加工硬化完全消除.

Heat Treatment of New High Strength Al-Mg-Si Alloy

Solution treatment and aging treatment of the new extruded aluminum alloy Al-Mg-Si were investigated by mechanical properties tests, SEM, DSC and metallographic microscope to supply the references for the heat treatment plans of productions and further experimental research. The results showed the over-burnt temperature of the extrusion is 572°C and the melting temperature is 594°C. Solution treatment at 560°C for 2 hours and aging treatment at 170°C for 12 hours are the optimal peak-aging treatment condition. The corresponding mechanical properties are 406 MPa in UTS, 340 MPa in yield strength and 18.37% in elongation. The fully recrystallization are observed in the extrusion, resulting in disappearing of the work hardening phenomenon.