Study on the Formability and Paintability of 6111 Aluminum Alloy Sheet for Automobile
The mechanical properties of 6111 aluminum alloy billets were tested by taking samples along the rolling direction at 0°,45° and 90°,respectively,and the fitted forming limit curve was carried out by simulation software.The formability and paint hardening of sheet were compared under different pre-aging and pre-strain conditions.The results showed that the 6111 aluminum alloy sheet had anisotropy,and the strength,strain hardening index n value and plastic strain ratio r value were the highest in the T4 and T4P5 states with the rolling direction at 0°.In the T4P5 state,the sheet had the best formability,with the lowest strength,the largest elongation,n value,r value,△r and forming limit value,the smallest yield ratio.The 6111 aluminum alloy sheet had good paint hardening performance,with the yield strength in-creased of 97 MPa compared to T4P5 state.After 2％plastic pre-strain treatment,the paint hardening per-formance of the sheet was further increased by 22 MPa.
万方数据
维普
