On the roles of stress-triaxiality and strain-rate on the deformation behavior of AZ31 magnesium alloys. Issue 2 (1st February 2018)

• Record Type: Journal Article
• Authors: Kale, C.; Rajagopalan, M.; Turnage, S.; Hornbuckle, B.; Darling, K.; Mathaudhu, S. N.; Solanki, K. N.
• Is Part Of: Materials research letters. Volume 6:Issue 2(2018)
• Page Start: 152
• Page End: 158
• Publication Date: 2018-02-01
• Subjects: Magnesium -- stress-triaxiality -- detwinning -- twin–twin interaction; 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: 10.1080/21663831.2017.1417923
• Languages: English
• ISSNs: 2166-3831

Abstract

ABSTRACT: The presence of complex states-of-stress and strain-rates directly influence the dominant deformation mechanisms operating in a given material under load. Mg alloys have shown limited ambient temperature formability due to the paucity of active slip-mechanisms, however, studies have focused on quasi-static strain-rates and/or simple loading conditions (primarily uniaxial or biaxial). For the first time, the influence of strain-rate and stress-triaxiality is utilized to unravel the active deformation mechanisms operating along the rolling, transverse- and normal-directions in wrought AZ31-alloy. It is discovered that the activation of various twin-mechanisms in the presence of multiaxial loading is governed by the energetics of the applied strain-rates. IMPACT STATEMENT It is shown for the first time that the higher deformation energy associated with dynamic strain-rates, coupled with high-triaxiality, promotes detwinning and texture evolution in HCP alloys with high c/a ratio. GRAPHICAL ABSTRACT: