Creep properties of an Al-2024 composite reinforced with SiC particulates
Spigarelli, S., Cabibbo, M., Evangelista, E. and Langdon, T.G. (2002) Creep properties of an Al-2024 composite reinforced with SiC particulates. Materials Science and Engineering A, 328, (1-2), 39-47. (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.
|Keywords:||aluminium alloys, creep, composites, threshold stress|
|Subjects:||T Technology > TJ Mechanical engineering and machinery
Q Science > QD Chemistry
Q Science > QC Physics
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences
|Date Deposited:||27 Mar 2006|
|Last Modified:||27 Mar 2014 18:13|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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