Mechanical and thermal properties of nanocarbon-reinforced aluminum matrix composites at elevated temperatures. (1st December 2016)

• Record Type: Journal Article
• Authors: Shin, S.E.; Ko, Y.J.; Bae, D.H.
• Is Part Of: Composites. Volume 106(2016)
• Page Start: 66
• Page End: 73
• Publication Date: 2016-12-01
• Subjects: Metal-matrix composites (MMCs) -- Mechanical properties -- Thermal properties -- Powder processing; Composite materials -- Periodicals; Materials science -- Periodicals; Composite materials; Periodicals; Electronic journals; 620.118
• DOI: 10.1016/j.compositesb.2016.09.017
• Languages: English
• ISSNs: 1359-8368

Abstract

Abstract: This study evaluated the mechanical and thermal properties of aluminum alloy 2024 (Al2024) matrix composites reinforced with multi-walled carbon nanotube (MWCNT) or few-layered graphene (FLG) in the temperature range of 250–430 °C. The Al2024/MWCNT and Al2024/FLG composites were fabricated using powder metallurgy, and the associated microstructures were observed. At 350 °C, both composites maintain high yield stress about 110 MPa, since uniform dispersion of the nano-scale reinforcements has a strong interface, hinders the dislocation movement and eutectic phase coarsening and severe softening of the matrix. The composites also show a low thermal expansion coefficient of ∼18×10 −6 / K . The results are respectively over ∼2.5 times higher strength and ∼20% lower CTE than those of commercial Al alloy used as piston material (AlSi12 CuMgNi).