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http://dx.doi.org/10.4150/KPMI.2006.13.5.366

Effect of Sintering Temperature on Microstructure and Mechanical Properties of Cu Particles Dispersed Al2O3 Nanocomposites  

Jeong, Young-Keun (National Core Research Center for Hybrid Materials Solution, Pusan National University)
Oh, Sung-Tag (Department of Materials Science and Engineering, Seoul National University of Technology)
Choa, Yong-Ho (Division of Materials and Chemical Engineering, Hanyang University)
Publication Information
Journal of Powder Materials / v.13, no.5, 2006 , pp. 366-370 More about this Journal
Abstract
The microstructure and mechanical properties of hot-pressed $Al_2O_3/Cu$ composites with a different sintering temperature have been studied. The size of matrix grain and Cu dispersion in composites increased with increase in sintering temperature. Fracture toughness of the composite sintered at high temperature exhibited an enhanced value. The toughness increase was explained by the thermal residual stress, crack bridging and crack branching by the formation of microcrack. The nanocomposite, hot-pressed at $1450^{\circ}C$, showed the maximum fracture strength of 707 MPa. The strengthening was mainly attributed to the refinement of matrix grains and the increased toughness.
Keywords
$Al_2O_3/Cu$ nanocomposites; Sintering temperature; Microstructure; Mechanical properties;
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