Spigarelli, S., Cabibbo, M., Evangelista, E. and Langdon, T.G.
Creep properties of an Al-2024 composite reinforced with SiC particulates
Materials Science and Engineering: A, 328, (1-2), . (doi:10.1016/S0921-5093(01)01698-7).
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Creep tests were conducted on an Al-2024 alloy reinforced with 15% SiC particulates. In this composite, as in earlier experiments on the unreinforced Al-2024 alloy, there is a continuous precipitation of fine particles throughout the tests. The creep behaviour of the composite reveals the presence of a threshold stress, and this stress depends upon both temperature and applied stress because more copious precipitation occurs in the more time-consuming tests conducted at the lower stress levels. The results for the composite are analysed using a procedure similar to that developed earlier for the unreinforced alloy. It is shown that the rate-controlling deformation mechanism is dislocation climb within the matrix alloy with a stress exponent of about 4.4 and an activation energy equal to that anticipated for lattice self-diffusion in pure aluminium.
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