Mechanical Properties and Damping Capacity of CNT Reinforced Aluminum Maxtrix Composites
Carbon nanotube(CNT)reinforced aluminum matrix(CNT/Al)composites have the advantages of light weight,high strength,high modulus,and easy processing,and have a great application prospect in the aerospace field as lightweight materials.In order to obtain a lightweight structural material with both good mechanical properties and perfect damping capacity,the 1.5%(mass fraction)CNT/2A12 composite is prepared by flake powder metallurgy and elemental alloying.When the composite is aged at 130℃for 6～14 h,it exhibits high tensile strength and good ductility.The tensile strength is up to 595 MPa at 12 h of aging,and the elongation is up to 14.0%at 8 h of aging.The damping capacity of the composite is about 0.005 at 0～180℃,but significantly increases at 180～300℃,reaching 0.05 at 300℃.The damping capacity is hardly affected by the aging time.The storage modulus of the composite decreases when the test temperature increases,and increases at 180～300℃when the vibration frequency increases.Taking the overall properties into consideration,at 130℃and 8 h,the 1.5%(mass fraction)CNT/2A12 composite has the optimal mechanical properties and damping capacity.
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