Seminars & Speakers


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Graphene-induced strengthening in metal matrix composites beyond its load-bearing effect
Speaker Prof. Qiang Guo
Affiliation State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University, Shanghai, China
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Date August 24, 2018
Time 2:00 pm
Venue Bldg.101, Room 101
Sponsor IBS-Center for Multidimensional Carbon Materials
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Attach 1917193931_L8cv4ItH_f8be3c6f7c1e58e5999bc4fb8d48ef38f0fc47fd.pdf (48.4K)
When nano-scaled reinforcements (“nanofillers”, such as CNT and graphene) are incorporated into a metal matrix, the enhancement in mechanical properties may well exceed those predicted by the “rule-of-mixtures”, owing to the rich interplay between the nanofiller and the various crystalline defects in the metal matrix. However, how the nanofillers and their interfaces with the matrix affect the deformation and failure mechanisms of the composites still remains elusive. Using nanolaminated graphene-Al and graphene-Cu composites as model materials, we showed that the graphene incorporation into the metal matrix led to a significant strengthening effect, even if the graphene layers were not oriented in their load-bearing orientations. Further strain-rate dependence and stress relaxation measurements demonstrated that the graphene inclusion at the metal grain boundaries improved the dislocation storage ability in the metal grains and facilitated the dislocationinterface interactions, both of which resulted in elevated strain hardening capacity and subsequently a considerable increase in mechanical strength. The easy control and general applicability of the grain boundary engineering by extrinsic nanofillers may open a new avenue for producing nanostructured metals with enhanced mechanical properties
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