Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7986002 | Micron | 2018 | 8 Pages |
Abstract
Hexagonal-close-packed structure aggregates exhibit complicated deformation behaviors, involving different slips and twinning. Synchrotron polychromatic X-ray microdiffraction (micro-XRD) was utilized to study in situ an extruded Mg-3Al-1Zn strip subjected to uniaxial tension. The evolution of grain rotation and lattice strain was analyzed under the load levels from 12 to 73â¯MPa. The micro-XRD data was used to map an area of 396â¯Ãâ¯200â¯Î¼m within the region of interest. The experimental set-up and X-ray diffraction microscopy in two dimensions allow the morphology, orientation and strain of the target grain to be determined at the submicron size. Results depict local orientation fluctuation, lattice strain evolution, slips system and elastic modulus within the same grain. As the applied load increases, the grain's rotation is accelerated between 46â¯MPa and 51â¯MPa at which level of load the grain-scale plastic deformation is activated. The predominantly slip modes prior to twin are identified as the combination of b1ââ¯=â¯(0002) [112¯0] andb3ââ¯=â¯(0002) [2¯110]. During the inspection, all reflection planes displayed an onset of micro yielding at the macro load level of â¼38â¯MPa. In this work, we confirm that magnesium is nearly elastic isotropic.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Li Li, Yuanzhi Wu, Jie Wu,