Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1578112 | Materials Science and Engineering: A | 2011 | 5 Pages |
The deformation mechanisms for rolled Mg–3Al–3Sn alloys were strongly dependent on grain sizes at room temperature. For grain sizes of ∼6–22 μm, the deformation in tension was mainly dominated by dislocation-slip, which, however, turned to be mediated by deformation-twinning for those of ∼22–41 μm. Moreover, as deformation proceeded, Hall–Petch slopes for slip-controlled-plasticity (kS) decreased gradually due to continuous activation of non-basal slips, while that for twinning-mediated-plasticity (kT) increased rapidly owing to increase in twin number and density, corresponding to grains below and above the medium-size of ∼22 μm respectively.
► Deformation mechanisms for rolled AT33 alloy strongly depend on grain sizes. ► For grains of ∼6–22 μm, tensile deformation is mainly dominated by dislocation-slip. ► For grains of ∼22–41 μm, however, which turns to be mediated by deformation-twinning. ► H–P slope for slip-controlled-plasticity decreases due to non-basal slip activation. ► While it for twinning-mediated-plasticity increase owing to increase in twin numbers.