Saadati, Mohammad, Azari Khosroshahi, Rasoul, Ebrahimi, Golamreza et Jahazi, Mohammad.
2017.
« Twin-assisted precipitation during hot compression of an Mg-Gd-Zn-Zr magnesium alloy ».
Materials Science and Engineering: A, vol. 706.
pp. 142-152.
Compte des citations dans Scopus : 22.
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Résumé
Dynamic precipitation in an Mg-Gd-Zn-Zr alloy during hot compression at 350℃ and 450℃ and at strain rates of 0.001-0.1s-1 is investigated. The deformation conditions were designed such as to promote twinning or slip of dislocations. The results indicated that both twinned and non-twinned grains were present at 350℃, with the extent being a function of the applied strain rate. The formation and propagation of {101̅2}〈1̅011〉 primary tensile twins within the twinned grains was identified as being at root of the twin-assisted precipitation phenomenon. The precipitates had spherical-morphology in the twinned grains whereas parallel arrays of rod-shaped precipitates formed in the non-twinned grains due to dynamic precipitation on the slip bands and the stacking faults. Twin-assisted precipitates were suppressed by increases in the strain rate at 350℃ because of the shorter time required for solute element diffusion towards the nucleated precipitates at that temperature. Increasing the deformation temperature to 450℃ changed the dominant deformation mechanism from twinning to slip of dislocations, resulting in the formation of rod-shaped precipitates similar to those observed in non-twinned grains at 350℃. An EBSD analysis was used to study the dominant deformation mechanism as a function of the Schmid factor, and the twinning deformation mechanism was found to be predominant in the grains having a lower Schmid factor.
| Type de document: | Article publié dans une revue, révisé par les pairs |
|---|---|
| Professeur: | Professeur Jahazi, Mohammad |
| Affiliation: | Génie mécanique |
| Date de dépôt: | 03 nov. 2017 20:09 |
| Dernière modification: | 08 sept. 2024 19:20 |
| URI: | https://espace2.etsmtl.ca/id/eprint/15838 |
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