Mechanical Properties and Fracture Study of Alumina Dispersion Hardened Copper-Based Nano-Composite at Elevated Temperatures

Abstract:

Alumina dispersion hardened copper-base composite was fabricated by internal oxidation method. The high temperature tensile fracture of Cu-Al₂O₃ composite was studied and tensile strengths were determined at different temperatures of 600, 680 and 780 °C. Microstructure was investigated by means of optical microscope and field emission scanning electron microscope (FESEM) with energy dispersive spectroscopy (EDS). Results show that, ultimate tensile strength and yield strength of copper alumina nanocomposite decrease slowly with increasing temperature. The yield strength reaches 119 MPa and ultimate tensile strength reaches 132 MPa at 780 °C. Surface fractography shows a dimple-type fracture on the fracture surface of the tensile tests where dimple size increases with increasing testing temperature and in some regions brittle fracture characteristics could be observed in the fracture surface.

• Periodical: Advanced Materials Research (Volume 829)
• Pages: 583-588
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.829.583
• Online since: November 2013
• Authors: Ali Dalirbod, Yahya A. Sorkhe*, Hossein Aghajani
• Keywords: Fracture, Mechanical Property, Metal Matrix Composite (MMC), Oxide Dispersion Strength (ODS)

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