Texture and Formability of Heat-treatable Magnesium Alloy Sheets Processed by Differential Speed Rolling

概要

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The differential speed rolling (DSR) process has been carried out on a heat-treatable AZ61 magnesium alloy at different rotation speed ratios (RSR). Compared with the normal symmetrically rolled sheet without an inclination of basal pole, the sheets DSR-processed at the RSRs of 1.17 and 1.36 exhibit the inclination of basal pole toward the rolling direction at about 5° and 10°, respectively, while the microstructures show approximately the same grain size of 7 μm. Increasing the RSR leads to the decreases in 0.2% proof stress (YS) and r-value as well as the increases in uniform elongation and n-value. For the sheet DSR-processed at the RSR of 1.36, the ultimate tensile strength (UTS), the YS, the fracture elongation (FE) and the Erichsen value (IE) are 313 MPa, 182 MPa, 24.3% and 4.7, respectively. This IE is higher than that (4.1) of the normal-rolled sheet. The improvement of the stretch formability can be attributable to the texture favored for the basal slip during deformation. After aging treatment, the UTS and the YS further increase to 336 MPa and 208 MPa, respectively, accompanied with a decrease in the FE.
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