Simultaneously enhanced strength and ductility of Mg-Zn-Zr-Ca alloy with fully recrystallized ultrafine grained structures

Publication date: 1 April 2017
Source:Scripta Materialia, Volume 131
Author(s): Ruixiao Zheng, Tilak Bhattacharjee, Akinobu Shibata, Taisuke Sasaki, Kazuhiro Hono, Mohit Joshi, Nobuhiro Tsuji
Fully recrystallized ultrafine grained (UFG) Mg-Zn-Zr-Ca alloy was successfully fabricated by a process including high pressure torsion (HPT) and subsequent rapid annealing treatment. After the HPT by one rotation, a nanocrystalline (NC) structure with an average grain size of about 100nm and deformed characteristics was obtained. After subsequent annealing at 300°C and 400°C for 1min, fully recrystallized UFG structures with average grain sizes of 0.77μm and 0.98μm were obtained, respectively. Room temperature tensile test revealed that the UFG Mg alloy exhibited simultaneously enhanced strength and ductility compared with those of the coarse grained counterpart.

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