MARYLAND UNIV COLLEGE PARK ENGINEERING MATERIALS GROUP
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It has been demonstrated that a strong interfacial bond is required to produce the observed strengthening in discontinuous SiCAl composites. Dislocation generation which is the strengthening mechanism is dependent upon a good bond existing between the SiC and the Al matrix. Although it has been shown that the stresses developed in the matrix as a result of the differences in the coefficients of thermal expansion between SiC and Al are greatly reduced by the motion and generation of dislocations, an elastic residual stress can still remain. An investigation was undertaken and it was determined that in the discontinuous SiCAl composites a tensile-elastic-residual stress remains in the matrix. It has been observed that as the strength of the matrix increases, e.g., due to alloying or age hardening, the percentage increase in yield or ultimate tensile strength decreases for a given volume per cent SiCal composite.
- Laminates and Composite Materials