首页|Simultaneously improving the strength and ductility of AZ91/GNPs composites through decorating graphene nanoplatelets with MgO
Simultaneously improving the strength and ductility of AZ91/GNPs composites through decorating graphene nanoplatelets with MgO
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Magnesium matrix composites(MgMCs)have always suffered low strengthening efficiency and poor duc-tility due to the difficulties in pursuing the well-bonded interface.Herein,graphene nanoplatelets(GNPs)were decorated with magnesium oxide nanoparticles(MgO NPs)through chemical co-precipitation and then incorporated into AZ91 alloy to fabricate MgMCs via powder thixoforging.The effect of MgO on the interface of the Mg/graphene system was investigated based on the first-principles calculations,and the result indicated that modifying GNPs with MgO NPs was helpful in improving the Mg-GNP inter-face bonding.The interface structural analysis revealed that the MgO NPs were firmly bonded with both GNPs and α-Mg through the distortion area bonding and semi-coherent interfacial bonding,severing as a bridge to fasten the interface bonding of composites.In addition,the MgO NPs on GNPs acted as a barrier to prevent GNPs from seriously reacting with the AZ91 alloy.As a result,the AZ91/MgO@GNPs composite was endowed with enhancements of 31％and 10％in the yield strength,and increments of 71％and 61％in elongation compared with the AZ91 alloy and AZ91/GNPs composite,respectively,exhibiting a more significant potential in optimizing the strength-toughness tradeoff compared with the AZ91/GNPs.More-over,the possible strengthening and toughening mechanisms were also discussed in detail.This work offers a relatively novel surface modification strategy to modulate the Mg-GNP interface for a simultane-ous improvement of strength and ductility.
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