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Phase selection of undercooled solidification of Ni–4.5 wt% B alloy

Published online by Cambridge University Press:  20 December 2013

Junfeng Xu ,
Feng Liu  and
Di Zhang
Junfeng Xu*
Affiliation:
Department of Metal Material Engineering, School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, People's Republic of China; and State Key Laboratory of Solidification Processing, Northwestern Polytechnic University, Xi'an 710072, People's Republic of China
Feng Liu*
Affiliation:
Department of Metal Material Engineering, School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, People's Republic of China; and State Key Laboratory of Solidification Processing, Northwestern Polytechnic University, Xi'an 710072, People's Republic of China
Di Zhang
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnic University, Xi'an 710072, People's Republic of China
*
a)Address all correspondence to this author. e-mail: liufeng@nwpu.edu.cn
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Abstract

Solidification of undercooled Ni–4.5 wt% B alloy melt was investigated by glass fluxing and cyclic superheating. A maximum melt undercooling up to ΔTp = 283 K has been achieved. If ∆Tp < 175 ± 10 K, the primary solidification is L → Ni3B; the structure consists of Ni3B dendrite + lamellar eutectic; the phase sizes and fractions depend on ∆Tp. If ∆Tp ≥ 175 ± 10 K, the primary solidification is L → Ni/Ni23B6; the structure consists of the dot-phase region + the anomalous eutectic/network boundary; the phase fractions mainly depend on ∆Tr; the dot phases are determined as rod eutectic and dot precipitates, while the network boundary is the divorced eutectic. The solidification pathways show that there is a common critical nucleation temperature, 1227 ± 10 K, for metastable eutectic reaction in hypoeutectic and hypereutectic Ni–Ni3B alloys.

Keywords

cooling curveundercoolingsolidificationeutectic
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 24 , 28 December 2013 , pp. 3347 - 3354
Copyright
Copyright © Materials Research Society 2013 

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