Korea made graphene nickel composite that were up to 4 times stronger than Titanium
They demonstrated a new material design in the form of a nanolayered composite consisting of alternating layers of metal (copper or nickel) and monolayer graphene that has ultra-high strengths of 1.5 and 4.0 GPa for copper–graphene with 70-nm repeat layer spacing and nickel–graphene with 100-nm repeat layer spacing, respectively. The ultra-high strengths of these metal–graphene nanolayered structures indicate the effectiveness of graphene in blocking dislocation propagation across the metal–graphene interface. Ex situ and in situ transmission electron microscopy compression tests and molecular dynamics simulations confirm a build-up of dislocations at the graphene interface.
The copper-graphene composite that has 500 times the tensile strength of copper (1.5 gigapascals), and a nickel-grapehene composite that has 180 times the tensile strength of nickel (4 gigapascals). This is still some way off graphene’s tensile strength of 130 GPa — which is about 200 times stronger than steel (600 MPa) — but it’s still very, very strong. At 1.5 GPa, copper-graphene is about 50% stronger than titanium, or about three times as strong as structural aluminium alloys.
Source: http://nextbigfuture.com/2014/09/korea-made-graphene-nickel-composite.html
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