Microstructural evolution of Al-1.3Si-0.7Mg-0.7Cu-0.3Mn aluminum alloy sheets during solution treatment

作者：Tian Ni^*; Zhao Gang; Liu Chun Ming; Zuo Liang

来源：Journal of Northeastern University, 2008, 29(1): 73-76.

• 6XXX series aluminum alloy
• Automotive body sheet
• Intermetallic phases
• Solution treatment

The evolution of intermetallic phases, grains and textures of cold rolled Al-1.3Si-0.7Mg-0.7Cu-0.3Mn aluminum alloy sheets during solution treatment at 540°C was investigated by XRD, OM and TEM observation and texture measurement. The results showed that there are many insoluble intermetallic phases such as Al9Fe0.84Mn2.16Si, Al95Fe4Cr and Al6Mn in the as-cold rolled alloy sheets, as well as some soluble ones including Al1.9CuMg4.1Si3.3 and Mg2Si. The soluble intermetallic phases smaller than 1 μm can be dissolved completely into matrix when the cold rolled sheets are bathed in molten salt at 540°C for over 12 min, and the sheets can be recrystallized within 2 min through solution treatment at 540°C to form the recrystalline textures {001}<310> and {110}<113>, where the former is dominant and both are of low intensity. It was revealed that the size and shape of recrystallized grains and the component of recrystalline textures change un-obviously when lengthening the time for solution treatment at 540°C to 60 min.

• 出版日期2008
• 单位东北大学