Title

Microstructure and Mechanical Properties of Alumina-copper Composites

Abstract

Alumina-copper composites were prepared by spontaneous infiltration of a molten copper-oxygen alloy into porous alumina preforms. Alumina preforms were prepared by partial sintering of powder compacts. A copper-7.0 atomic percent oxygen alloy was infiltrated into the preforms by heating to 1350°C under an inert atmosphere. The oxygen content of the copper phase in the composites was subsequently adjusted by heat treatment in controlled partial pressures of oxygen with target oxygen contents in the copper of 0.1, 1.7, 3.5, and 7.0 atomic percent. The strength and toughness of alumina-copper composites were measured as a function of the oxygen content in the copper to determine the effect of interfacial adhesion on mechanical properties. Strength and toughness did not vary significantly with oxygen content. Average strength was between 400 and 500 MPa and toughness was between 9 and 11 MPa·m1/2.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Alumina; Alumina-Copper Composites; Metallic Matrix Composites

Library of Congress Subject Headings

Copper
Microstructure

Document Type

Book - Chapter

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2003 John Wiley & Sons, All rights reserved.

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