Improvement of Drawability at Room Temperature in AZ31 Magnesium Alloy Sheets Processed by Equal Channel Angular Rolling |
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Authors: | Yong Qi Cheng Zhen Hua Chen Wei Jun Xia Tao Zhou |
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Affiliation: | (1) School of Materials Science and Engineering, Hunan University, Changsha, 410082, Hunan, China |
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Abstract: | A new rolling process, so-called as equal channel angular rolling (ECAR) process, for fabricating the magnesium alloy sheets
with an enhanced formability at room temperature is introduced. The ECAR device was designed so that it could feed the sheet
with the preheated temperature of 673 K in a continuous manner at a relatively high speed of 0.43 m/s. A significant amount
of the shear deformation could be achieved by passing the sheet through the mold with the oblique angle of 115°. The x-Ray
spectra were examined to analyze the crystal orientation of the sheets, which indicates that the crystal orientation with
non-basal plane was fabricated after ECAR processing. The grain was not refined and plenty of twins were brought out because
of the low-shear deforming temperature. The high stress and low ductility for the ECARed specimens can be related to the presence
of twins. In spite of having the similar optical microstructure, the elongation to failure for the ECARed specimens after
annealing was above 33%, which was larger than that of about 20% for the as-received/annealed specimens. And the drawability
for the ECARed/annealed specimens with the Erichsen value of 6.24 mm and the limiting drawing ratio of 1.6 can be obtained,
which is improved dramatically than that of 4.18 mm and 1.2 for the as-received/annealed specimens, respectively. These can
be related to the rotation of (0002) basal plane toward the rolling direction because of the shear deformation induced by
ECAR process. |
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Keywords: | crystal orientation drawability equal channel angular rolling magnesium alloy sheets tensile properties |
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