Issue |
MATEC Web Conf.
Volume 321, 2020
The 14th World Conference on Titanium (Ti 2019)
|
|
---|---|---|
Article Number | 12024 | |
Number of page(s) | 4 | |
Section | Microstructure Evolution | |
DOI | https://doi.org/10.1051/matecconf/202032112024 | |
Published online | 12 October 2020 |
Decomposition of the β phase at intermediate temperature in β-metastable Ti-5553 alloy
a Université de Lorraine - CNRS, IJL, 2 allée André Guinier, 54000 Nancy, France
b CIRIMAT, Université de Toulouse, 4 allée Emile Monso, 31030 Toulouse, France
c Safran Landing Systems, site de Bidos, 9 rue Guynemer, 64401 Oloron Sainte Marie, France
The present contribution focuses on the nature of the β → α transformation in Ti-5333 alloy at intermediate temperatures. It is indeed still unclear whether this transformation is only controlled by bulk diffusion or whether interfacial kinetics may play a role. To address this issue, we have combined SEM and STEM-EDX to measure the concentrations of Al, Cr, Mo, V and Fe in α intragranular precipitates as well as in the abutting β matrix, paying a particular attention to the concentrations at flat interfaces corresponding to the precipitates habit planes. The comparison with Calphad calculations suggests that interfaces are not at equilibrium during the thickening of the plates.
Key words: Ti-5553 alloy / phase transformation kinetics / STEM-EDX analysis / α/β interfaces
© The Authors, published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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