Influence of an applied strain field on microstructural evolution during the α2→O-phase transformation in Ti-Al-Nb system

Y. H. Wen; Y. Wang; L. Q. Chen

doi:10.1016/S1359-6454(00)00306-2

Influence of an applied strain field on microstructural evolution during the α₂→O-phase transformation in Ti-Al-Nb system

Y. H. Wen, Y. Wang, L. Q. Chen

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Abstract

We investigate the influence of an applied homogeneous strain on the coherent α₂ (DO₁₉) to O-phase transformation in Ti-Al-Nb alloys using a phase-field approach. The emphasis is on the effect of the applied strain on the two-phase morphology, as well as the equilibrium volume fractions of different orientation domains of the O-phase. It is found that the applied homogeneous strain field does not change the essential features of the morphological patterns, but does alter the relative amount of each orientation domain and the equilibrium volume fraction of the O-phase. When the applied strain is of the same order of magnitude as the stress-free transformation strain, the initial two-phase mixture becomes unstable and transforms into a single O-phase.

Original language	English (US)
Pages (from-to)	13-20
Number of pages	8
Journal	Acta Materialia
Volume	49
Issue number	1
DOIs	https://doi.org/10.1016/S1359-6454(00)00306-2
State	Published - Jan 8 2001

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/S1359-6454(00)00306-2

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title = "Influence of an applied strain field on microstructural evolution during the α2→O-phase transformation in Ti-Al-Nb system",

abstract = "We investigate the influence of an applied homogeneous strain on the coherent α2 (DO19) to O-phase transformation in Ti-Al-Nb alloys using a phase-field approach. The emphasis is on the effect of the applied strain on the two-phase morphology, as well as the equilibrium volume fractions of different orientation domains of the O-phase. It is found that the applied homogeneous strain field does not change the essential features of the morphological patterns, but does alter the relative amount of each orientation domain and the equilibrium volume fraction of the O-phase. When the applied strain is of the same order of magnitude as the stress-free transformation strain, the initial two-phase mixture becomes unstable and transforms into a single O-phase.",

author = "Wen, {Y. H.} and Y. Wang and Chen, {L. Q.}",

note = "Funding Information: This work is supported by NSF under grant DMR-96-33719 (Wen and Chen) and DMR-9703044 (Wen and Wang). The simulation was performed at the San Diego Supercomputer Center and the Pittsburgh Supercomputing Center (DMR940015). ",

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N1 - Funding Information: This work is supported by NSF under grant DMR-96-33719 (Wen and Chen) and DMR-9703044 (Wen and Wang). The simulation was performed at the San Diego Supercomputer Center and the Pittsburgh Supercomputing Center (DMR940015).

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N2 - We investigate the influence of an applied homogeneous strain on the coherent α2 (DO19) to O-phase transformation in Ti-Al-Nb alloys using a phase-field approach. The emphasis is on the effect of the applied strain on the two-phase morphology, as well as the equilibrium volume fractions of different orientation domains of the O-phase. It is found that the applied homogeneous strain field does not change the essential features of the morphological patterns, but does alter the relative amount of each orientation domain and the equilibrium volume fraction of the O-phase. When the applied strain is of the same order of magnitude as the stress-free transformation strain, the initial two-phase mixture becomes unstable and transforms into a single O-phase.

AB - We investigate the influence of an applied homogeneous strain on the coherent α2 (DO19) to O-phase transformation in Ti-Al-Nb alloys using a phase-field approach. The emphasis is on the effect of the applied strain on the two-phase morphology, as well as the equilibrium volume fractions of different orientation domains of the O-phase. It is found that the applied homogeneous strain field does not change the essential features of the morphological patterns, but does alter the relative amount of each orientation domain and the equilibrium volume fraction of the O-phase. When the applied strain is of the same order of magnitude as the stress-free transformation strain, the initial two-phase mixture becomes unstable and transforms into a single O-phase.

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Influence of an applied strain field on microstructural evolution during the α₂→O-phase transformation in Ti-Al-Nb system

Abstract

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