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

被引:149
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
收藏
页码:5019 / 5022
页数:4
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