| Issue |
MATEC Web Conf.
Volume 321, 2020
The 14th World Conference on Titanium (Ti 2019)
|
|
|---|---|---|
| Article Number | 11035 | |
| Number of page(s) | 7 | |
| Section | Microstructure - Properties Relationships | |
| DOI | https://doi.org/10.1051/matecconf/202032111035 | |
| Published online | 12 October 2020 | |
TEM observation of precipitates and their role to mechanical properties in Ti-5553 alloy heated to some temperatures up to 923 K
1 Okayama Univ. of Science ; Okayama 700-008, Japan
2 Institut Jean Lamour, UMR 7198 CNRS - Université de Lorraine, Nancy, France
3 CIRIMAT, Université de Toulouse, CNRS, Toulouse, France
A Ti-5553 specimen was continuously heated to 923 K and simultaneously in-situ HEXRD profiles were taken. In addition, specimens heated at the same rate to several temperatures up to 923 K and further quenched were observed by transmission electron microscopy. Based on both results obtained, transformation sequence was clarified, precipitations of ω-, α”iso- and α-phases were confirmed, and size and density of these precipitates were measured. Hardness values of those specimens were also measured. The hardening mechanism was considered as shearing-mechanism for specimens aged at lower temperatures and by-pass one for specimens aged at higher temperature. An attempt of distinction between α”iso - and α-precipitates was also tried. Both precipitates were in needle-like shape and a possibility was suggested by measuring angles between two needle-shape precipitates on {110} of the matrix and comparing with each other.
© The Authors, published by EDP Sciences, 2020
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