Effect of Heat Treatments on Properties of High Purity Al-Cu-Mg-Ag Alloy with Trace Mn and Zr

Abstract:

Effects of solid solution heat treatment and aging heat treatment on high purity Al-Cu-Mg-Ag alloys with trace Mn and Zr were investigated. Results show that when the alloys are solid solution treated at 520-525 ℃, the mechanical properties reach up to a relatively high level, and the solid solution time has little effect on the properties. The time to reach peak aging is about 12 h at 160 ℃ but only 4 h at 180 ℃. Adding trace Mn and Zr could increase the elongation of Al-Cu-Mg-Ag alloys greatly. However, Mn element could decrease the tensile strength while Zr could increase it significantly. Both Mn and Zr elements can improve the heat resistance of Al-Cu-Mg-Ag alloys markedly.