Abstract
A chemical potential gradient exists across the reinforcement/matrix interface of metal-matrix composites which serves as the basis for either diffusion or chemical reaction between the two components at high temperatures. While poor control of this reaction may degrade mechanical properties, it may also be employed to improve them. Such improvements as an increase in elastic modulus in the case of Al-Mg/SiC(p) are attributable to improved load transfer, due either to an interactive diffusion process at the interface or the 'keying' effect of interfacial Al4C3. A systematic study is presently undertaken of the effects of 600 C exposure on the microstructure and mechanical properties of Al/20 vol pct TiC; a reduction in tensile ductility is associated with an increase in strength and elastic modulus. 5 refs.
Published Version
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