Friction stir processing of a metastable β titanium alloy in β and α+β phase fields

A metastable β titanium alloy Ti–5Al–5Mo–5V–3Cr (Ti-5553) was friction stir processed (FSP) in both the β and α+β phase fields. Homogenous microstructures were obtained in both phase fields by adjusting FSP parameters. The mean β grain size after FSP varied from 15 to ~0.7 μm from the single-phase β...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2020-01, Vol.772, p.138705, Article 138705
Main Authors: Balachandran, Shanoob, Mishra, Rajiv S., Banerjee, Dipankar
Format: Article
Language:English
Subjects:
Aging (metallurgy)
Beta phase
Friction stir processing
Grain size
Microtexture
Recrystallization
Strength
Titanium alloys
Titanium base alloys
β Titanium alloys
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Summary:A metastable β titanium alloy Ti–5Al–5Mo–5V–3Cr (Ti-5553) was friction stir processed (FSP) in both the β and α+β phase fields. Homogenous microstructures were obtained in both phase fields by adjusting FSP parameters. The mean β grain size after FSP varied from 15 to ~0.7 μm from the single-phase β to α+β conditions, respectively. At the α+β conditions, a near-globular α phase (50–200 nm in size) was observed. Microstructure and microtexture evolution in β and α+β conditions were investigated with the aid of scanning and transmission electron microscopy. Ultra-fine intra-granular α and duplex α microstructures were generated at both conditions by duplex aging of the FSP samples. The FSP alloys display excellent combinations of strength and ductility.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2019.138705