The synergy effect of fine and coarse grains on enhanced ductility of bimodal-structured Mg alloys

By Hang Zhang, Huiyuan Wang, Jin–guo Wang, J. Rong, M. Zha, Cheng Wang, Pingchuan Ma, Q. Jiang. Journal of Alloys and Compounds, 2019

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Abstract A novel Mg-8Al-2Sn-1Zn alloy with a bimodal structure prepared by hard-pate-rolling (HPR) exhibits both higher tensile strength and ductility than its fine-grained counterparts prepared by conventional rolling. By delicate electron back-scatter diffraction (EBSD) analysis, we found fine grains with weak basal texture is beneficial for basal slip and favors initial deformation. Meanwhile, coarse grains with a strong basal texture could accommodate abundant newly generated dislocations, promoting work hardening after fine grains are saturated with dislocations. For the first time, individual roles of fine and coarse grains and their synergy effect on enhancing ductility in bimodal structured Mg alloys is clarified.

Subfields: Biomaterials, Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/bbfc9e7633430b0111f6b6ab6cde36e451b236c7