Precipitate-dislocation interaction mediated Portevin-Le Chatelier-like effect in a beta-stabilized Ti-Mo-Nb-Al alloy. (November 2016)

• Record Type: Journal Article
• Authors: Choudhuri, Deep; Mantri, Srinivas Aditya; Alam, Talukder; Banerjee, Srikumar; Banerjee, Rajarshi
• Is Part Of: Scripta materialia. Volume 124(2016)
• Page Start: 15
• Page End: 20
• Publication Date: 2016-11
• Subjects: Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.06.043
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: 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. Graphical abstract: