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首页> 外文期刊>Journal of Materials Research and Technology >Microstructural characteristics of magnesium alloy sheets subjected to high-speed rolling and their rolling temperature dependence
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Microstructural characteristics of magnesium alloy sheets subjected to high-speed rolling and their rolling temperature dependence

机译：高速轧制镁合金薄板的显微组织特征及其轧制温度依赖性

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摘要

Microstructural and textural variations of an AZ31 Mg alloy during its high-speed rolling (HSR) and their dependence on the rolling temperature are investigated by performing HSR at temperatures of 300°C, 350°C, and 400°C at a rolling speed of 470m/min with 80% reduction in a single pass. Shear band formation is observed in all the high-speed-rolled (HSRed) materials; however, with increasing rolling temperature, the density and intensity of the shear bands decrease considerably because of an increase in deformation homogeneity. With increasing rolling temperature, the area fraction of dynamically recrystallized (DRXed) grains gradually increases owing to the promoted twinning-induced recrystallization behavior. With an increase in the rolling temperature from 300°C to 350°C, the average grain size of the HSRed materials decreases owing to the reduced area fraction of coarse unDRXed grains; however, at 400°C, the average grain size increases owing to the increased DRXed grain size. With decreasing rolling temperature, the basal texture of the HSRed materials tilts from the normal direction toward the rolling direction, owing to the intensive shear deformation at lower temperatures. The texture intensity also increases with decreasing rolling temperature because of an increase in the area fraction of the unDRXed region, which has a considerably strong texture.
机译：通过在300°C，350°C和400°C的温度下进行HSR轧制，研究了AZ31 Mg合金在高速轧制（HSR）期间的组织和组织变化以及对轧制温度的依赖性。 470m / min，单程降低80％。在所有高速轧制（HSRed）材料中均观察到剪切带的形成;但是，随着轧制温度的升高，剪切带的密度和强度由于变形均匀性的增加而大大降低。随着轧制温度的升高，由于孪晶诱导的再结晶行为的促进，动态再结晶（DRXed）晶粒的面积分数逐渐增加。随着轧制温度从300°C升高到350°C，HSRed材料的平均晶粒尺寸由于未粗大的非DRX晶粒的减小而减小。然而，在400°C时，由于DRXd晶粒尺寸的增加，平均晶粒尺寸增加。随着轧制温度的降低，由于在较低温度下的强烈剪切变形，HSRed材料的基础织构从法线方向朝轧制方向倾斜。织纹强度也随着轧制温度的降低而增加，这是由于未DRXed区域的面积分数增加，该区域具有相当强的织构。

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