An Investigation of Detwinning Behavior of In-plane Compressed E-form Mg Alloy During the In Situ Tensile Test
01 Jan 2019-pp 201-206
TL;DR: In this article, the detwinning phenomenon of in-plane compressed E-form magnesium alloy sheet was investigated using in situ tensile test combined with electron backscattered diffraction (EBSD) technique.
Abstract: In this study, we investigated the detwinning phenomenon of in-plane compressed E-form magnesium (Mg) alloy sheet systematically using in situ tensile test combined with electron backscattered diffraction (EBSD) technique. Microstructure and microtexture evolutions were analyzed at different tensile strains during the in situ tensile test. The detwinning phenomenon in E-form Mg alloy was found to be linked to both twin boundary mobility and the interaction of their boundaries with dislocations. The pre-compressed sheet of E-form Mg alloy effectively accommodated the thickness direction strains generated during the in situ tensile test. The effect of detwinning on formability and mechanical behavior of the E-form Mg alloy was also examined. EBSD results indicate that most of the deformation twins formed during in-plane compression were removed when the load is reversed during the in situ tensile test.
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TL;DR: In this paper, an extruded ZK60 magnesium alloy was subjected to fully-reversed strain-controlled cyclic loading at a strain amplitude of 4.0% in the extrusion direction in ambient air.
41 citations
10 Jan 2014-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, three-point bending and tensile tests were performed on rare earth containing ZEK100 at room temperature and various displacement rates (10, 50, 100, 200 and 500mm/min) The bend was either parallel to the rolling direction (RD specimens) or the transverse direction (TD specimens) The TD specimens presented higher bendability than the RD specimens.
Abstract: Three-point bending and tensile tests were performed on rare earth containing ZEK100 at room temperature and various displacement rates (10, 50, 100, 200 and 500 mm/min) The bend was either parallel to the rolling direction (RD specimens) or the transverse direction (TD specimens) The TD specimens presented higher bendability than the RD specimens For the TD specimens, fracture did not occur at low displacement rates of 10, 50 and 100 mm/min, but occurred at 200 and 500 mm/min Fracture occurred in the RD specimens at all the displacement rates Cracks were observed in both the compression zone and the tension zone Tensile tests in the RD and the TD show that the ductility in the TD is about three times as much as in the RD, leading to the better bendability in the RD specimens The initial texture was examined by X-ray diffraction (XRD) and the results show that the (0001) basal texture was weakened and spread along the TD due to the addition of the rare earth elements In-situ electron backscatter diffraction (EBSD) analysis was performed when the specimen was being bent, and the results show that {10 1 ¯ 2}〈10 1 ¯ 1 ¯ 〉 twinning was activated in both the compression zone and the tension zone, different from highly textured AZ31 sheets Our results indicate that the ZEK100 Mg alloy still presents anisotropy in the tensile properties and in the bending behavior, despite the weakened basal texture
41 citations
TL;DR: In this paper, two-step loading tests were performed on an AZ31 rolled magnesium alloy sheet with strong basal texture in the normal direction, and the deformation behavior such as a stress-strain curve, Lankford value, and texture evolution was investigated both experimentally and numerically.
41 citations
TL;DR: In this paper, the deformation and failure behaviors of E-form magnesium (Mg) alloy sheets were investigated using a mini-V-bending test using an electron back-scattered diffraction (EBSD) technique.
29 citations
TL;DR: The extreme instability of the twins during compression indicates that both twin and detwinning require extremely low resolved shear stresses under the authors' experimental conditions.
23 citations