Formation of a 'splitting pattern' associated with L12 precipitates in Ir-Nb alloys

Y. Yamabe-Mitarai; H. Harada

doi:10.1080/095008302317262606

Formation of a 'splitting pattern' associated with L1₂ precipitates in Ir-Nb alloys

Y. Yamabe-Mitarai, H. Harada

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

A cuboidal L1₂ phase forms in the fcc matrix of an Ir-Nb alloy. Under some conditions, a rod- or plate-like fcc structure can be observed in this phase. This is similar to the 'splitting pattern' observed in some Ni-based alloys. To understand the formation mechanism of this structure, samples were heated under different conditions. Microstructure evolution during ageing was observed by transmission electron microscopy. We observed a splitting pattern only when the L1₂ precipitates were already formed in the as-cast condition after additional heat treatment at the ageing temperature. In this case, the composition of the L1₂ phase was not equilibrated. We conclude that the splitting pattern appears owing to a kinetic phenomenon when the L1₂ phase changes to the equilibrium composition.

Original language	English
Pages (from-to)	109-118
Number of pages	10
Journal	Philosophical Magazine Letters
Volume	82
Issue number	3
DOIs	https://doi.org/10.1080/095008302317262606
Publication status	Published - 2002 Mar 1
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics

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AB - A cuboidal L12 phase forms in the fcc matrix of an Ir-Nb alloy. Under some conditions, a rod- or plate-like fcc structure can be observed in this phase. This is similar to the 'splitting pattern' observed in some Ni-based alloys. To understand the formation mechanism of this structure, samples were heated under different conditions. Microstructure evolution during ageing was observed by transmission electron microscopy. We observed a splitting pattern only when the L12 precipitates were already formed in the as-cast condition after additional heat treatment at the ageing temperature. In this case, the composition of the L12 phase was not equilibrated. We conclude that the splitting pattern appears owing to a kinetic phenomenon when the L12 phase changes to the equilibrium composition.

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