PHYSICAL-MECHANISM OF GRAIN-REFINEMENT IN SOLIDIFICATION OF UNDERCOOLED MELTS

被引：294

作者：

SCHWARZ, M ^{[1
]}

KARMA, A ^{[1
]}

ECKLER, K ^{[1
]}

HERLACH, DM ^{[1
]}

机构：

[1] NORTHEASTERN UNIV,DEPT PHYS,BOSTON,MA 02115

来源：

PHYSICAL REVIEW LETTERS | 1994年 / 73卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.73.1380

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 interdendritic 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 to two transitions, both of which are observed.

引用

页码：1380 / 1383

页数：4

共 17 条

[1] SOLUTE TRAPPING - COMPARISON OF THEORY WITH EXPERIMENT [J].