|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Magnesium Alloy Development: An LMD Symposium in Honor of Karl Kainer
||C-58: The Effect of Shearable Plate-shaped Precipitates on the Strength of Mg Alloys
||Sean Agnew, Jishnu J Bhattacharyya, Fulin Wang
|On-Site Speaker (Planned)
The effect of precipitates on the flow behavior of Mg alloys is investigated. TEM characterization provides unequivocal evidence that plate-shaped β’ precipitates in Mg alloy WE43 are sheared by basal slip of <a> dislocations. It is suggested that order strengthening is the dominant mechanism by which the β’ phase strengthens the WE-series alloys, rather than Orowan bowing. A new model for order strengthening by plate-shaped precipiates is developed. The present work has significant implications for alloy Mg design strategies by emphasizing the importance of accounting for the effect of precipitate (or GP zone) shearing on the strength of Mg alloys. In particular, it emphasizes the need for accurate estimates of APB energies (γ-surfaces), of the candidate strengthening phases. Additionally, attention is refocused on the fact that there are two regimes of ordered precipitate shearing, which can forestall the onset of Orowan bowing to even larger particle sizes.