In-situ synthesis of Mg-based bulk metallic glass matrix composites with primary α-Mg phases

Herein, we systematically investigate the in-situ synthesis and mechanical properties of Mg-based bulk metallic glass matrix composites (BMGMCs). From a well-known Mg65Cu25Gd10 bulk glass former, a series of Mg65+xCu20-2x/3Zn5Gd10-x/3 (x = 0-18 at%) alloys are systematically designed and Mg-rich (> 77 at% Mg) glassy/crystalline matrix composites containing primary alpha-Mg phases are successfully developed. Mg77Cu12Zn5Gd6 BMGMC (x = 12 at%) exhibits over two times higher compressive fracture strength (773 +/- 20.6 MPa) and specific strength (2.6 x 10(5) N m kg(-1)) than commercial Mg alloys such as AZ31 or AZ91. In particular, compared with monolithic Mg-based BMGs, the BMGMC displays obvious yielding, serrated plastic flow and plastic strain of 0.22 +/- 0.02%. This result is attributed to the dispersed primary alpha-Mg phases which prevent the rapid propagation of shear bands and promote the formation of multiple shear bands. The Mg-rich crystalline matrix composites (x = 14-18 at%) containing primary alpha-Mg phases exhibit an enhancement in the plastic strain (from 0% to 1.51%) and pronounced work hardening at the expense of yield strength (< 500 MPa) due to the absence of the amorphous phase. These results would give us a promising strategy to fabricate Mg-based BMGMCs with high specific strength and enhanced plasticity for lightweight structural applications. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

By systematically designing Mg-based bulk metallic glass matrix composites containing primary alpha-Mg phases, the developed materials exhibit significantly higher compressive fracture strength and specific strength compared to commercial Mg alloys. The presence of dispersed primary alpha-Mg phases in the composite materials inhibits rapid shear band propagation and promotes the formation of multiple shear bands, leading to enhanced plasticity and work hardening. These results suggest a promising strategy for fabricating Mg-based BMGMCs with high specific strength and enhanced plasticity for lightweight structural applications.