Existence of seaweed structures in rapidly solidified Ni3Ge intermetallic

JOURNAL OF ALLOYS AND COMPOUNDS

卷:801

Article

Haque, Nafisul^1,2  Mullis, Andrew M.¹ 

[1] Univ Leeds, Sch Chem & Proc Engn, Leeds LS2 9JT, W Yorkshire, England

[2] NEDUET, Dept Met Engn, Univ Rd, Karachi 75270, Pakistan

关键词: Rapid solidification;    Intermetallic compound;    Dendritic microstructure;    Dendritic seaweed;   

DOI  :  10.1016/j.jallcom.2019.06.050

来源: Elsevier

【 摘 要 】

The congruently melting, single phase intermetallic beta-Ni3Ge has been subject to rapid solidification via drop-tube processing. A range of morphologies are observed in this material including spherulites, dendrites (which may display either orthogonal or non-orthogonal side-branching), a recrystallized structure and dendritic seaweed with increasing departure from equilibrium. In the case of the seaweed structure only, a progressive transition from high undercooling morphologies near the nucleation point to low undercooling morphologies is evident as growth proceeds. This appears to indicate that unlike normal dendritic growth, seaweed growth does not reach a steady-state and may in fact be more akin to growth at a planar interface. (C) 2019 Elsevier B.V. All rights reserved.

【 授权许可】

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