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Multi-transformations in rapid solidification of highly undercooled hypoeutectic Ni–Ni3B alloy melt

Published online by Cambridge University Press:  09 October 2015

Junfeng Xu ,
Di Zhang ,
Feng Liu  and
Zengyun Jian
Junfeng Xu
Affiliation:
The Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, Xi'an Technological University, Xi'an, Shaanxi Province 710021, People's Republic of China
Di Zhang
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi Province 710072, People's Republic of China
Feng Liu*
Affiliation:
The Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, Xi'an Technological University, Xi'an 710021, People's Republic of China; and State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi Province 710072, People's Republic of China
Zengyun Jian
Affiliation:
The Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, Xi'an Technological University, Xi'an, Shaanxi Province 710021, People's Republic of China
*
a)Address all correspondence to this author. e-mail: liufeng@wpu.edu.cn
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Abstract

The solidification of undercooled Ni–3.3 wt% B alloy was studied by high-speed video analysis and microstructural analysis. For moderate initial undercooling (ΔTp = 75 K), the solidification interface for primary phase transformation manifests a shape of a planar dendrite, and possesses an constant growth velocity, for eutectic transformation whereas the interface presents multi-dendrite shape and spasmodic growth, so that a constant velocity cannot describe the interface exactly. These differences suggest that primary phase solidification is controlled by far-distance diffusion while eutectic solidification by short-distance diffusion. For large initial undercooling (ΔTp = 262 K), a kinds of large “white dendrites”, which is in fact composed of multiple phases, were found in the microstructure, from inside to outside of which, the eutectic phase changes from dot phases (anomalous structure) to irregular eutectic and then to regular eutectic, indicating that the center of “white dendrites” may be the nucleation zone of eutectic reaction.

Keywords

undercoolingeutecticsolidificationgrowth velocity
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 21 , 13 November 2015 , pp. 3307 - 3315
Copyright
Copyright © Materials Research Society 2015 

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Footnotes

Contributing Editor: Yang-T. Cheng

References

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