Enhancement of strain-rate sensitivity and shear yield strength of a magnesium alloy processed by high-pressure torsion. (1st January 2015)

• Record Type: Journal Article
• Authors: Choi, In-Chul; Lee, Dong-Hyun; Ahn, Byungmin; Durst, Karsten; Kawasaki, Megumi; Langdon, Terence G.; Jang, Jae-il
• Is Part Of: Scripta materialia. Volume 94(2015)
• Page Start: 44
• Page End: 47
• Publication Date: 2015-01-01
• Subjects: Grain boundary sliding -- High-pressure torsion -- Magnesium alloy -- Strain-rate sensitivity -- Yielding; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2014.09.014
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract : A Mg–Zn–Zr alloy was processed by high-pressure torsion for up to 2 turns at room temperature to produce significant grain refinement together with enhanced plasticity and strength. Measurements were performed to determine the strain-rate sensitivity, shear yield strength and activation volume as a function of the processing conditions. The results suggest there is a significant contribution from grain boundary sliding to the flow process and the onset of plasticity is associated with heterogeneous dislocation nucleation.