Competition between prismatic and basal slip in hexagonal titanium–aluminum alloys with short-range order. Issue 6 (3rd June 2023)

• Record Type: Journal Article
• Authors: Kwasniak, P.; Delannoy, S.; Prima, F.; Clouet, E.
• Is Part Of: Materials research letters. Volume 11:Issue 6(2023)
• Page Start: 407
• Page End: 413
• Publication Date: 2023-06-03
• Subjects: Titanium–aluminum alloys -- ordering -- plasticity -- dislocations; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2023.2169082
• Languages: English
• ISSNs: 2166-3831

Abstract

Abstract : Plasticity of hexagonal titanium–aluminum alloys depends on the solute concentration and the order state of Al atoms. Development of short-range order (SRO) modifies Al strengthening and impacts the competition between prismatic and basal slip modes. Using ab initio calculations, we study the interaction of a screw dislocation with isolated Al atoms and Al pairs in an hcp Ti existing in short-range ordered Ti–Al alloys. Calculated activation energies reveal pronounced hardening caused by Al addition for both slip systems, which become competitive. This hardening is enhanced for Al pairs, resulting in a reduced plastic anisotropy of Ti–Al alloys with SRO. GRAPHICAL ABSTRACT: UF0001 IMPACT STATEMENT: Short-range ordering is shown to impact plasticity in ahexagonal Ti–Al solid solution through ab initio modeling of dislocation interaction withsolute and pair of solute atoms.