We investigated the effect of Gd and Ce additions in magnesium on sigmoidal hardening behavior associated with {101̅2} twinning after extrusion. Compression along extrusion direction revealed that rare earth additions enhance the flow stress, while 〈c+a〉 softening was expected. This phenomenon has been explained by the enhancement of 〈c+a〉 dislocations activity and the ensuing increase in forest hardening due to solute drag. It is expected that dislocation transmutation of basal to prismatic will be enhanced during {101̅2} twin growth in rare earth containing alloys, which would exacerbate 〈c+a〉 entanglement with the dislocation forests inside the twins. Forest hardening events overcompensated for the softening effects from lowering the critical resolved shear stresses of 〈c+a〉 dislocations, and resulted in higher flow stress for the binary rare earth containing alloys.
CITATION STYLE
Imandoust, A., Barrett, C. D., & El Kadiri, H. (2018). Effect of rare earth addition on {101̅2} twinning induced hardening in magnesium. Materials Science and Engineering: A, 720, 225–230. https://doi.org/10.1016/j.msea.2018.02.067
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