采用不同异速比(1.2～1.8)和轧制路径对MB1镁合金板材进行异步轧制,对轧制得到合金板材的显微组织和力学性能进行了研究.结果表明:开始随着异速比(＜1.6)的增大,MB1镁合金板材的显微组织逐渐细化,孪晶数量不断减少,抗拉强度和伸长率增大;当异速比为1.6时,合金的晶粒最均匀细小,平均尺寸约为20μm,且几乎没有孪晶,抗拉强度为235 MPa,伸长率达到23%;再进一步增大异速比,合金的力学性能又有所下降;按不同路径进行轧制,合金的晶粒逐步细化、均匀,孪晶依次减少,板材的伸长率按路径A,B,C,D的顺序逐步升高,强度逐步降低.
The microstructure and mechanical properties of MB1 magnesium alloy sheet produced by differential speed rolling process under the conditions of different rolling speed ratios (1.2-1.8) and rolling routes were studied. The results show that when the rolling speed ratio increased from 1.2 to 1.6, the grains became refined and twins disappeared gradually, and the tensile strength and elongation all increased. Especially when the rolling speed ratio was 1.6, the alloy had minimum grain size of 20 μm with no twin, its tensile strength and elongation could reach 235 MPa and 23%. However, when the rolling speed ratio increased further, the mechanical properties droped a little. When the routes were changed from A, B, C to D, the grains became refined and twins disappeared gradually, while the strength decreased and elongation increased gradually.
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