Precipitate-dislocation interaction mediated Portevin-Le Chatelier-like effect in a beta-stabilized Ti-Mo-Nb-Al alloy

Portevin-Le Chatelier (PLC)-like effect was observed in a commercial alloy based on Ti-Mo-Nb-Al, which exhibited serrations in its tensile stress-strain response within a temperature-strain rate window. The serrations manifested as repeated load-drop and rise, and were rationalized on the basis of s...

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Bibliographic Details
Published in:Scripta materialia 2016-11, Vol.124, p.15-20
Main Authors: Choudhuri, Deep, Mantri, Srinivas Aditya, Alam, Talukder, Banerjee, Srikumar, Banerjee, Rajarshi
Format: Article
Language:English
Subjects:
Dislocations
Dynamics
Parents
Plastic flow
Precipitates
Precipitation
Stress-strain relationships
Titanium base alloys
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Summary:Portevin-Le Chatelier (PLC)-like effect was observed in a commercial alloy based on Ti-Mo-Nb-Al, which exhibited serrations in its tensile stress-strain response within a temperature-strain rate window. The serrations manifested as repeated load-drop and rise, and were rationalized on the basis of sudden plastic flow along the “soft” ω precipitate free micro-slip-bands created by the passage of leading dislocations in the parent β matrix. Subsequently, dynamic precipitation of the α phase occurred within the ω-free micro-slip-bands. These results demonstrate that the PLC-like effect can be manifested via precipitate-dislocation interactions, and is not limited to the traditionally accepted solute-dislocation interactions. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2016.06.043