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采用不同异速比对AZ31镁合金板材进行异步轧制,并将轧后样品进行显微组织和X射线衍射分析,研究异速比对镁合金板材组织和织构转变的影响.结果表明:异速比的变化对晶粒形貌影响较大但晶粒细化效果不明显;当异速比为2.800时,板材内出现了长条晶粒;快速辊侧{0002}基面织构强度高于慢速辊侧,且板材两侧表面{0002}晶面的偏转方向相反;异速比对基面织构的强度影响显著,随着异速比的增大,基面织构的强度先增加后下降.这种特殊的织构变化与异步轧制过程中沿厚度方向引入的剪切变形有关.
The effects of different speed ratio on the microstructure and texture change of magnesium alloy sheet were investigated by means of different speed ratio of AZ31 magnesium alloy sheet. The results showed that: The change of speed ratio had a great influence on the grain morphology but the effect of grain refinement was not obvious. When the ratio of velocity was 2.800, long grain appeared in the sheet. The {0002} On the slow roll side, the direction of {0002} crystal plane deflection on the two sides of the plate is opposite; the allotment ratio has a significant effect on the strength of the base plane texture. With the increase of alloteric ratio, the intensity of the base plane texture Increase and then decrease.This special texture change is related to the shear deformation introduced in the thickness direction during the process of asynchronous rolling.