首页|(111696)Effect of yttrium on nanocrystallization of magnesium alloys during cold rotary swaging
(111696)Effect of yttrium on nanocrystallization of magnesium alloys during cold rotary swaging
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NSTL
Elsevier
In this study, binary Mg-2Y alloy, pure Mg, and AZ31 alloy were prepared via cold rotary swaging. Micro-structure evolution during the grain refnement process was explored using transmission electron microscopy. The results showed that it was impossible to achieve nanocrystallization in pure Mg via cold rotary swaging, which was attributed to the diffculty of forming dislocation arrays. In contrast, after swaging, nanograins were obtained in an alloy formed by adding 2 wt% Y to Mg. In the early stage of swaging, the initial coarse grains of the Mg-2Y alloy were subdivided by the formation of twin lamellae, dislocation arrays (in the matrix) and deformation bands. With increasing strain, more dislocation arrays were formed within the twin lamellae and deformation bands, which resulted in further refnement of the twin lamellae and deformation bands and promoted the formation of nanoscale subgrains. As the swaging process continued, these nanoscale subgrains transformed into nanograins with high-angle grain boundaries. Nanograins were also developed in the swaged AZ31 alloy. The formation rate of nanograins during swaging was slower, and the grain refnement effect after swaging was weaker, in the Mg-2Y alloy than the AZ31 alloy.
NSTL
Elsevier
