Dynamic tensile behaviors of AZ31B magnesium alloy processed by twin-roll casting and sequential hot rolling |
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| Affiliation: | 2. Department of Mechanical, Energy and Management Engineering, University of Calabria, Rende, CS 87036, Italy;3. Center for Biomedical Engineering, University of Kentucky, Lexington, KY 40506, USA;1. University of Kentucky, Institute for Sustainable Manufacturing (ISM), Lexington, KY 40506, USA;2. University of Calabria, Department of Mechanical, Energy and Management Engineering, 87036 Rende (CS), Italy;1. Materials Department, University of California Santa Barbara, Santa Barbara, CA 93106-5050, United States;2. Materials Science and Engineering Department, 2300 Hayward Street, Ann Arbor, MI 48109, United States;3. Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States |
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| Abstract: | The dynamic tensile behavior of twin-roll cast-rolled and hot-rolled AZ31B magnesium alloy was characterized over strain rates ranging from 0.001 to 375 s?1 at room temperature using an elaborate dynamic tensile testing method, and the relationship between its mechanical properties and microstructures. It is observed that the sheet has a strong initial basal fiber texture and mechanical twinning becomes prevalent to accommodate the high-rate deformation. The yield strength and ultimate tensile strength monotonically increase with increasing the strain rate, while the strain hardening exponent proportionally decreases with increasing the strain rate due to twinning-induced softening. The total elongation at fracture distinctly decreases as the strain rate increases under quasi-static tension, while the effect of strain rate on the total elongation is not distinct under dynamic tension. Fractographic analysis using a scanning electron microscope reveals that the fracture is a mixed mode of ductile and brittle fracture. |
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| Keywords: | magnesium alloy twin-roll casting dynamic tensile strain-rate sensitivity fractography |
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