Physical mechanism of grain refinement in solidification of undercooled melts.
Physical mechanism of grain refinement in solidification of undercooled melts.
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DOI：
10.1103/physrevlett.73.1380
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发表时间：
1994-09
影响因子：
8.6
通讯作者：
M. Schwarz;A. Karma;K. Eckler;D. Herlach
中科院分区：
文献类型：
--
作者：
M. Schwarz;A. Karma;K. Eckler;D. Herlach
有人提出，广泛观察到的过渡凝固过冷熔体从粗晶粒的树枝状晶粒细化等轴显微组织的结果从碎片的枝晶重熔在一段时间后的枝晶间熔体凝固的结晶。这一机制是支持的实验证明，在Cu-Ni合金的过渡过冷度随冷却速率的方式，这是相对较好地定量描述了一个简单的破碎模型。后者还预测了两个转变的发生，这两个都被观察到。
It is proposed that the widely observed transitions in solidification of undercooled melts from a coarse grained dendritic to a grain refined equiaxed microstructure result from the fragmentation of dendrites by remelting during the period following recalescence where the inter-dendritic melt solidifies. This mechanism is supported by the experimental demonstration in Cu-Ni alloys that the transition undercoolings vary with cooling rate in a way which is relatively well described quantitatively by a simple fragmentation model. The latter also predicts the occurrence of two transitions, both of which are observed.