Dynamics and mechanism of columnar grain growth of pure iron under directional annealing

Dynamics and mechanism of columnar grain growth of pure iron under directional annealing
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纯铁定向退火柱状晶长大动力学及机理

DOI:
10.1016/j.actamat.2007.07.019
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发表时间:
2007-10
期刊:
影响因子:
9.4
通讯作者:
--
中科院分区:
材料科学1区
文献类型:
--
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对纯铁等轴小晶粒在定向退火条件下的柱状晶长大动力学和机制进行了实验研究。结果证明了柱状晶生长的抽拉速度存在一个上限和一个下限。重要的是,存在一个最佳的抽拉速度,在该速度下可以获得最大的柱状晶纵横比。提出了一种描述柱状晶生长的动力学方法。该方法可以成功地预测柱状晶的纵横比。柱状晶生长的机制本质上可以描述为晶界的选择性生长或竞争性迁移。作为选择性生长的结果,柱状晶粒之间的边界富含低能边界。柱状晶内部的小岛状晶粒由于其小角晶界或孪晶晶界的低迁移率而残留。
The dynamics and mechanism of columnar grain growth of pure iron with small equiaxed grains were experimentally investigated under directional annealing. The results prove the existence of both a lower- and an upper limit of the withdrawing velocity for columnar grain growth. Importantly, there is an optimum withdrawing velocity at which the largest aspect ratio of columnar grains can be obtained. A kinetic approach is suggested to describe the growth of the columnar grains. The aspect ratio of the columnar grains can be successfully predicted by this approach. The mechanism of the columnar grain growth essentially can be described as selective growth or competitive migration of the grain boundaries. As a result of selective growth, the boundaries between the columnar grains abound in low-energy boundaries. Small island-like grains inside the columnars grain can be left over due to the low mobility of their small-angle boundaries or twin boundaries.
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