Gaohui Wu (Oral) Harbin Institute of Technology, China
Gaohui Wu, born in 1955, is the professor of Harbin Institute of Technology. His research focus has been on the designing, fabricating and characterizing metal matrix composites. He has invented tens of novel composites and successfully solved the problems that hinder the development of some significant arms and equipments. Professor WU has won the National Award for Technological Invention (2nd Class) and the National Award for Science and Technology Progress (Grand Prize). He has over 200 journal publications and has obtained 47 awarded Chinese patents.
Title：Exploring the Graphene Reinforced Aluminum Alloy
SymposiumGO Manufacture Technology
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Abstract
The studies in graphene reinforced aluminum alloys have already reported that the addition of 0.1 - 0.3 vol.% graphene can impressively increase the material strength by 30%- 62%.
In the presented work, Al-20Si reinforced by graphene with 1 – 7 vol.% is fabricated by pressure infiltration. The reinforcement of 3 vol.%, as shown by experiment, can improve the three-point-bending strength by 230%, and the tensile strength by 150%. It is inferred that the addition of 10 vol,% graphene could increase the bending and tensile stiffness of the composite to 1GPa and 800MPa while reduce its density.
The composite with 7 vol.% graphene becomes a self-lubricating material, which has the coeffeicient of friction and wear below 0.2. At the same composition, the compressive strength at 400℃ is 260MPa, which is equivalent to the matrix material, and the thermal expansion coefficient is reduced to 13.9×10-6 /K.
The nature of these significant improvements in mechanical and physical properties is still not clear, but it seems to be clear that the graphene reinforced aluminum alloy, as the next generation metal matrix composite, should have a promising prospect.
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