Repeated unidirectional bending (RUB) was carried out to improve the texture of commercial AZ3 IB magnesium alloy sheets. All specimens were prepared in the rolling direction. The forming limit diagrams (FLDs) of AZ31B magnesium alloy sheet were determined experimentally by conducting stretch-forming tests at room temperature, 100, 200 and 300 ℃. Compared with the as-received sheet, the lowest limited strain of AZ31B magnesium alloy sheet with tilted texture in the FLD increased by 79% at room temperature and 104% at 100 ℃. The texture also affected the extension of the forming limit curves (FLC) in the FLD. However, the FLCs of two kinds of sheets almost overlapped at temperature above 200 ℃. It can be concluded that the reduction of (0002) texture intensity is effective to the improvement of formability not only at room temperature but also at low-and-medium temperature. The effect of texture on FLDs becomes weak with increasing temperature.%通过单向多道次弯曲(RUB)来改善商业AZ3IB镁合金的织构,所有的试样都沿轧制方向制备.在室温、100、200和300℃下,通过延展成形实验研究AZ31B镁合金的成形极限图(FLDs).与原始板材相比,在室温和100℃下,FLD中具有倾斜织构的AZ31B镁合金的最低极限应变分别提高了79%和104%.织构也影响FLD中成形极限曲线(FLC)的范围.当温度高于200℃时,两种板材的FLCs几乎重合.(0002)基面织构强度的削弱不仅有助于室温成形性能的提高,而且有助于中低温度成形性能的提高.随着温度的升高,织构对FLDs的影响减弱.
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