NDLI: Effect of Nb on the Growth Behavior of Co$_{3}$Sn$_{2}$ Phase in Undercooled Co-Sn Melts

Content Provider	Springer Nature Link
Author	Kang, Jilong Xu, Wanqiang Wei, Xiuxun Ferry, Michael Li, Jinfu
Copyright Year	2016
Abstract	The growth behavior of the primary β-Co$_{3}$Sn$_{2}$ phase in (Co$_{67}$Sn$_{33}$)$_{100−x }$Nb$_{ x }$ (x = 0, 0.5, 0.8, 1.0) hypereutectic alloys at different melt undercoolings was investigated systematically. The growth pattern of the β-Co$_{3}$Sn$_{2}$ phase at low undercooling changes with the Nb content from fractal seaweed (x = 0, 0.5) into dendrite (x = 0.8) and then returns to fractal seaweed (x = 1.0) as a response to the changes in interface energy anisotropy and interface kinetic anisotropy. As undercooling increases, the dendritic growth of the β-Co$_{3}$Sn$_{2}$ phase in (Co$_{67}$Sn$_{33}$)$_{99.2}$Nb$_{0.8}$ alloy gives way to fractal seaweed growth at an undercooling of 32 K (−241 °C). At larger undercooling, the fractal seaweed growth is further replaced by compact seaweed growth, which occurred in the other three alloys investigated. The growth velocity of the β-Co$_{3}$Sn$_{2}$ phase slightly increases at low and intermediate undercooling but clearly decreases at larger undercooling due to the Nb addition. The growth velocity sharply increases as the growth pattern of the Co$_{3}$Sn$_{2}$ phase transits from fractal seaweed into compact seaweed.
Starting Page	6187
Ending Page	6196
Page Count	10
File Format	PDF
ISSN	10735623
Journal	Metallurgical and Materials Transactions A
Volume Number	47
Issue Number	12
e-ISSN	15431940
Language	English
Publisher	Springer US
Publisher Date	2016-09-15
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metallic Materials Characterization and Evaluation of Materials Structural Materials Surfaces and Interfaces, Thin Films Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Metals and Alloys Condensed Matter Physics

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