Characterization of Deformation Behavior of Individual Grains in Polycrystalline Cu-Al-Mn Superelastic Alloy Using White X-ray Microbeam Diffraction

Abstract

White X-ray microbeam diffraction was applied to investigate the microscopic deformation behavior of individual grains in a Cu-Al-Mn superelastic alloy. Strain/stresses were measured in situ at different positions in several grains having different orientations during a tensile test. The results indicated inhomogeneous stress distribution, both at the granular and intragranular scale. Strain/stress evolution showed reversible phenomena during the superelastic behavior of the tensile sample, probably because of the reversible martensitic transformation. However, strain recovery of the sample was incomplete due to the residual martensite, which results in the formation of local compressive residual stresses at grain boundary regions. OPEN ACCESSMetals 2015, 5 1846

Metals Challenged by Neutron and Synchrotron Radiation

“…The deformation behavior of individual grains in polycrystalline Cu-Al-Mn super-elastic alloy is presented by Kwon et al [18], who use a 15 × 15 µm 2 beam of white high-energy X-rays in the transmission of a 200 µm thick tensile specimen with a 400 µm grain size. When scanned over the grains and their boundaries, the recorded white-beam Laue diffraction patterns minutely reveal grain orientation, as well as gradients therein.…”