Effect of deformation on α-β phase transformation temperature of a metestable TiZr based alloy

•α-β transformation temperature will change obviously after hot deformation.•Deformed α phase will decrease α → β phase transformation temperature.•Deformed β phase will increase β → α phase transformation temperature.•Stored energy caused by dislocation is the main reason. The preparation process o...

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Bibliographic Details
Published in:Materials letters 2021-02, Vol.285, p.129003, Article 129003
Main Authors: Jiang, X.J., Bai, J., Yang, N., Ran, Q.X., Wang, S.Q.
Format: Article
Language:English
Subjects:
Beta phase
Deformation effects
Heat treating
Heat treatment
Materials science
Metals and alloys
Microstructure
Phase stability
Phase transformation
Phase transitions
Titanium alloys
Titanium base alloys
Transformation temperature
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Summary:•α-β transformation temperature will change obviously after hot deformation.•Deformed α phase will decrease α → β phase transformation temperature.•Deformed β phase will increase β → α phase transformation temperature.•Stored energy caused by dislocation is the main reason. The preparation process of titanium alloys usually includes hot deformation and post heat treatment, and the formulation of heat treatment process needs to be based on the key factor of α-β phase transformation temperature. The results of current study show that the α-β transformation temperature will change obviously after hot deformation. The transformation temperature of α → β phase decreases after deformation in the single α region, and the transformation temperature of β → α phase increases with deformation in the single β region. The key reason is that the energy of α and β phase increases and the phase stability decreases due to the defects formed during hot deforming. The current study means that titanium alloys need to be analyzed by DSC before heat treatment, and the phase transformation temperature should be re-determined according to different deformation processing. The results of current study are of great significance to the formulation of heat treatment process for titanium alloys.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2020.129003