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In situ observation of solidification of undercooled hypoeutectic Ni–Ni3B alloy melt

Published online by Cambridge University Press:  26 June 2013

Junfeng Xu ,
Feng Liu  and
Di Zhang
Junfeng Xu
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnic University, Xi’an Shaanxi 710072, People’s Republic of China; andDepartment of Metal Material Engineering, School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an 710032, People’s Republic of China
Feng Liu*
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnic University, Xi’an Shaanxi 710072, People’s Republic of China; andDepartment of Metal Material Engineering, School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an 710032, People’s Republic of China
Di Zhang
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnic University, Xi’an Shaanxi, 710072, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Solidification of undercooled Ni–3.3 wt% B alloy melt was investigated by glass fluxing. If ΔTe < 140 ± 10 K, two recalescences appear, indicating that stable eutectic reaction occurs; if ΔTe ≥ 140 ± 10 K, three recalescences can be observed, indicating that metastable eutectic reaction occurs. Analysis indicates that the phase fractions of the as-solidified structure can be predicted by the recalescence delay times in the cooling curves. High-speed video images show that the solidification interface of primary solidification changes from single dendritic shape to spherical shape with increasing ΔTp; the interface of eutectic solidification changes from many small “dendrites” to a single large one with increasing ΔTe; the interface of residual liquid solidification changes from many small rings to a single large one with increasing ΔTr. The growth velocity of eutectic solidification suggests a coupled growth at small and moderate undercoolings and decoupled growth at large undercooling, whereas that of residual liquid solidification cannot be interpreted by the available models.

Keywords

solidificationeutecticsrecalescencecooling curveshigh-speed video (HSV)
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 14 , 28 July 2013 , pp. 1891 - 1902
Copyright
Copyright © Materials Research Society 2013 

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