Deformation-induced γ ↔ α2 phase transformation in TiAl alloy compressed at room temperature

Chunrin Chien; W. Lu; Y. Y. Cui; L. L. He; H. Q. Ye

doi:10.1016/j.intermet.2006.10.016

Deformation-induced γ ↔ α₂ phase transformation in TiAl alloy compressed at room temperature

Chunrin Chien, W. Lu, Y. Y. Cui, L. L. He, H. Q. Ye

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

9 Citations (Scopus)

Abstract

Deformation-induced γ ↔ α₂ phase transformation in a Ti-47Al-2Cr-2Nb-0.2Y (at.%) alloy compressed at room temperature was investigated by high-resolution transmission electron microscopy (HREM) and energy dispersive spectrum (EDS). The deformation-induced (DI) γ → α₂ phase transformation occurred in a twin intersection region. On the other hand, the deformation-induced α₂ → γ transformation nucleated at the stacking faults of α₂ phase. The composition analysis of the γ and α₂ laths by EDS suggested that composition of some laths deviated much from their equilibrium values. These composition deviations promoted the deformation-induced γ ↔ α₂ phase transformation to occur; EDS results also suggested that there was no composition difference between the DI-γ plate and the primary γ phase. Based on the HREM and EDS experimental results, the mechanism of the deformation-induced γ ↔ α₂ phase transformation has been discussed.

Original language	English
Pages (from-to)	722-726
Number of pages	5
Journal	Intermetallics
Volume	15
Issue number	5-6
DOIs	https://doi.org/10.1016/j.intermet.2006.10.016
Publication status	Published - 2007 May 1

Keywords

A. Titanium aluminides, based on TiAl
B. Phase transformations
D. Microstructure
F. Electron microscopy, transmission

ASJC Scopus subject areas

Chemistry(all)
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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title = "Deformation-induced γ ↔ α2 phase transformation in TiAl alloy compressed at room temperature",

abstract = "Deformation-induced γ ↔ α2 phase transformation in a Ti-47Al-2Cr-2Nb-0.2Y (at.%) alloy compressed at room temperature was investigated by high-resolution transmission electron microscopy (HREM) and energy dispersive spectrum (EDS). The deformation-induced (DI) γ → α2 phase transformation occurred in a twin intersection region. On the other hand, the deformation-induced α2 → γ transformation nucleated at the stacking faults of α2 phase. The composition analysis of the γ and α2 laths by EDS suggested that composition of some laths deviated much from their equilibrium values. These composition deviations promoted the deformation-induced γ ↔ α2 phase transformation to occur; EDS results also suggested that there was no composition difference between the DI-γ plate and the primary γ phase. Based on the HREM and EDS experimental results, the mechanism of the deformation-induced γ ↔ α2 phase transformation has been discussed.",

keywords = "A. Titanium aluminides, based on TiAl, B. Phase transformations, D. Microstructure, F. Electron microscopy, transmission",

author = "Chunrin Chien and W. Lu and Cui, {Y. Y.} and He, {L. L.} and Ye, {H. Q.}",

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AU - Chien, Chunrin

AU - Lu, W.

AU - Cui, Y. Y.

AU - He, L. L.

AU - Ye, H. Q.

PY - 2007/5/1

Y1 - 2007/5/1

N2 - Deformation-induced γ ↔ α2 phase transformation in a Ti-47Al-2Cr-2Nb-0.2Y (at.%) alloy compressed at room temperature was investigated by high-resolution transmission electron microscopy (HREM) and energy dispersive spectrum (EDS). The deformation-induced (DI) γ → α2 phase transformation occurred in a twin intersection region. On the other hand, the deformation-induced α2 → γ transformation nucleated at the stacking faults of α2 phase. The composition analysis of the γ and α2 laths by EDS suggested that composition of some laths deviated much from their equilibrium values. These composition deviations promoted the deformation-induced γ ↔ α2 phase transformation to occur; EDS results also suggested that there was no composition difference between the DI-γ plate and the primary γ phase. Based on the HREM and EDS experimental results, the mechanism of the deformation-induced γ ↔ α2 phase transformation has been discussed.

AB - Deformation-induced γ ↔ α2 phase transformation in a Ti-47Al-2Cr-2Nb-0.2Y (at.%) alloy compressed at room temperature was investigated by high-resolution transmission electron microscopy (HREM) and energy dispersive spectrum (EDS). The deformation-induced (DI) γ → α2 phase transformation occurred in a twin intersection region. On the other hand, the deformation-induced α2 → γ transformation nucleated at the stacking faults of α2 phase. The composition analysis of the γ and α2 laths by EDS suggested that composition of some laths deviated much from their equilibrium values. These composition deviations promoted the deformation-induced γ ↔ α2 phase transformation to occur; EDS results also suggested that there was no composition difference between the DI-γ plate and the primary γ phase. Based on the HREM and EDS experimental results, the mechanism of the deformation-induced γ ↔ α2 phase transformation has been discussed.

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KW - B. Phase transformations

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