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Abstract
The tensile and fracture creep behavior of aluminum-SiC composites has been evaluated under isothermal and cyclic heating conditions. The true strain to fracture under thermal cycling conditions is shown to decrease linearly with the logarithm of the applied stress. This trend is unexpected since the strain rate sensitivity exponent, m, is high (typical of superplastic materials) and constant over the range of stresses studied. The results obtained are explained by a fracture mechanics model in which the crack size increases by a strain-induced mechanism. The results are compared with similar behavior obtained in superplastic ceramics.
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