EVIDENCE FOR A TRANSITION FROM DIFFUSION-CONTROLLED TO THERMALLY CONTROLLED SOLIDIFICATION IN METALLIC ALLOYS

被引：150

作者：

ECKLER, K ^{[1
]}

COCHRANE, RF ^{[1
]}

HERLACH, DM ^{[1
]}

FEUERBACHER, B ^{[1
]}

JURISCH, M ^{[1
]}

机构：

[1] ZENT INST FESTKORPERPHYS & WERKSTOFFORSCH,W-8027 DRESDEN,GERMANY

来源：

PHYSICAL REVIEW B | 1992年 / 45卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.45.5019

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Dendrite growth velocities have been measured as a function of undercooling in droplets of dilute alloys of B in Ni undercooled by up to 306 K using an electromagnetic levitation technique. At a critical undercooling, depending strongly on the B concentration, a steep rise of the dendrite growth velocity is observed. The analysis of the results within current theories of dendrite growth gives evidence for a transition from diffusion-limited to purely thermally controlled growth with partitionless solidification as a consequence.

引用

页码：5019 / 5022

页数：4

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