A study of stress relaxation in AZ31 using high-energy X-ray diffraction. (December 2015)

• Record Type: Journal Article
• Authors: Tang, W.; Halm, K.L.; Trinkle, D.R.; Koker, M.K.A.; Lienert, U.; Kenesei, P.; Beaudoin, A.J.
• Is Part Of: Acta materialia. Volume 101(2015)
• Page Start: 71
• Page End: 79
• Publication Date: 2015-12
• Subjects: Mg alloy -- High-energy X-ray diffraction -- Stress relaxation -- Plasticity -- Cyclic micro-plasticity; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2015.08.072
• Languages: English
• ISSNs: 1359-6454

Abstract

Graphical abstract: Abstract: The micro-plasticity of the Mg alloy AZ31 is explored through high-energy X-ray diffraction (HEXD). Through cyclic loading of the sample, a softening response is found to follow the resolved shear stress for basal slip. Stress relaxation is studied by applying an incremental elongation increase while continuously collecting images from a detector array. The rate exponent associated with a particular reflection is developed by evaluating the average lattice strain in the loading direction from the composite detector image collected at a particular point in time, and then following the time evolution. A distinct rate exponent is identified for grain orientations that have a propensity for slip on second-order pyramidal planes, highlighting the capability to capture the simultaneous action of different deformation mechanisms through HEXD.