Commercial purity as-cast magnesium was hot rolled and subsequently annealed at different temperatures in order to investigate its grain growth behavior and link it to the texture evolution. Annealing at an intermediate temperature of 220 °C gave rise to abnormal grain growth with a few grains reaching a grain diameter 10 times larger than the mean. Increasing the annealing temperature to 350 °C yielded normal grain growth. Both types of grain growth revealed a strengthening of the (0001) $〈11\stackrel{\mathrm{-}}{2}0〉$ texture component. It is hypothesized that a dislocation density gradient after recrystallization grants (0001) $〈11\stackrel{\mathrm{-}}{2}0〉$ grains a size advantage during early stages of growth. The type of growth will be, however, determined by the mobility of the present grain boundaries and triple junction drag, which are strongly dependent on the annealing temperature. The above hypothesis of the interplay between these parameters was explored through curvature- and residual dislocation-density-gradient-driven grain growth simulations using a formerly developed level-set approach. The simulation outcome suggests that application of such a modeling approach in microstructure studies of magnesium can provide valuable new insights into the problem of grain growth and associated texture evolution.

将商业纯度的铸态镁进行热轧，然后在不同的温度下进行退火，以研究其晶粒生长行为并将其与织构演变联系起来。在220°C的中间温度下退火会导致晶粒异常生长，一些晶粒的晶粒直径比平均直径大10倍。将退火温度提高到350°C可使晶粒正常生长。两种类型的谷物生长都显示出（0001）的增强$〈11\stackrel{\mathrm{--}}{2}0〉$纹理成分。假设重结晶后的位错密度梯度为（0001）$〈11\stackrel{\mathrm{--}}{2}0〉$在生长的早期阶段，谷物具有尺寸优势。然而，生长的类型将取决于当前晶界和三重结阻力的迁移率，这在很大程度上取决于退火温度。通过使用以前开发的水平集方法通过曲率和残余位错密度梯度驱动的晶粒生长模拟，探索了这些参数之间相互作用的上述假设。模拟结果表明，这种建模方法在镁的微观结构研究中的应用可以提供有关晶粒生长和相关纹理演变问题的有价值的新见解。