|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Magnesium Technology 2018
||Impact of Grain size on Failure of Hot-Rolled AZ31 during Tensile Loading
||Seyed Hadi Mohamadi Azghandi, Matthias Weiss, Benedicta D. Arhatari, Matthew Barnett
|On-Site Speaker (Planned)
||Seyed Hadi Mohamadi Azghandi
Several techniques, including optical microscopy, electron microscopy (SEM) and tensile testing equipped with GOM-ARAMIS system were employed to evaluate hot rolled AZ31 with three different grain sizes 7, 12 and 30 μm, in terms of ductility and its relationship to failure behaviour. Uniform and total elongation show an increase with grain refinement. However, total elongation is influenced more significantly which can indicate enhancement of post-necking elongation. Post necking elongation is mostly linked to failure through void formation. Voids formed during tensile loading are likely to be changed with reducing grain size. Length and aspect ratio of dimples on fracture surface show a remarkable decrease when average grain size reduces from 30 to 7μm. Penny-shaped dimples in coarse grained (30 μm) AZ31 change to mostly fine round-shaped ones in the fine grained (7 μm) material. Twinning activity exhibits a significant reduction which can be a reason for changing void formation.