Abstract
The ratcheting behavior in an extruded AZ31B magnesium alloy was investigated under uniaxial stress-controlled cyclic loading at room temperature. The results showed that basal <a> slip, prismatic <a> slip and {10–12} extension twinning/detwinning are the deformation mechanisms accommodating cyclic strain. The weight of the slips or the twinning/detwinning that relates to stress amplitude affects the valley strain and ratcheting strain. The increase of the weight of the dislocation slips results in an increment of strain hardening rate. When the stress amplitude is 105 MPa, the hardening rate is higher than that at the amplitudes of 45 MPa and 75 MPa, which leads to a ratcheting strain development deviating from the regular pattern.
Published Version
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