Effect of Ca alloying and cryogenic temperature on the slip transmission across the grain boundary in pure Mg

The effect of variable Ca (0.3 and 0.5 (wt%)) and deformation temperature on the microstructure, texture and slip behavior of pure Mg is investigated. The uniaxial compression tests were performed to 5%-strain and till fracture at room (RT) and cryogenic temperature (-150 degrees C, CT) at the strain rate of 10-3 s-1 along rolling direction. The microstructural observation revealed that all the samples displayed equiaxed mi-crostructure and grain size reduction was observed in Mg-Ca alloys. Compared with the strong basal texture Mg, the weak textured Mg-Ca alloys showed remarkable strength/ductility synergy. The detailed post-mortem analysis showed that all samples displayed significant twinning evolution irrespective of the de-formation temperature. The slip transmission maps across the grain boundaries showed basal < a > slip dominated plastic deformation in pure Mg, whereas Mg-0.3Ca and Mg-0.5Ca showed abundant pris-matic < a > and pyramidal < c+a > slip activity at both deformation temperatures. (c) 2023 Published by Elsevier B.V.

Automated summary

The effect of variable Ca content and deformation temperature on the microstructure, texture, and slip behavior of pure Mg was investigated. Uniaxial compression tests were performed at room and cryogenic temperatures. The results showed that Mg-Ca alloys exhibited a smaller grain size compared to pure Mg. The weak textured Mg-Ca alloys demonstrated a remarkable strength/ductility synergy. Additionally, the slip behavior analysis revealed different slip activities in Mg and Mg-Ca alloys.