LDH Formability Tests of Asymmetrically Rolled Aluminum Alloy Sheets

In this study, the formability of a developed asymmetrically rolled(ASR)aluminum alloy sheet and the conventional symmetrically rolled(SR)one are examined experimentally by employing limiting dome height(LDH)test. The micro crystalline morphological changes, such as the texture evolution under the various proportional straining paths, are observed by using SEM-EBSD measurement. Simultaneously, the failures of the sheets are detected to establish the forming limits in the in-plane principal strains space, such as forming limit diagram. SEM-EBSD measurement results show a significant effect of the strain path on the texture evolutions. It reveals that the ASR sheet evolutes the shear texture more than SR one, and it can be related to improve the formability by employing this asymmetrical rolling. Consequently, ASR sheet shows the better forming limit for the particular strain path, such as the strain path ε1/ε2=tan60°(proportional rolling ratio) and the bi-axial stretching.