SUPERPLASTIC DEFORMATION OF SICP 2024 AL COMPOSITE FABRICATED BY SPRAY ATOMIZATION AND CODEPOSITION/

In this paper, data are presented on the microstructure and superplast ic deformation mechanics of an aluminum alloy, 2024, containing 10 vol % SiC particles. The material was fabricated bg spray atomization and codeposition. The properties were studied after pretreatment by isothe rmal hot compression and isothermal hot forward extrusion (extrusion r atio 10.0). The experimental results show that the strain-rate sensiti vity index (m-value) is 0.48 and the limit elongation (the elongation at fracture) is 345 % during superplastic: uniaxial tension, The optim um conditions for superplastic: behavior are 753 K of deformation temp erature and 1.0 x 10(-3) s(-1) of initial strain rate. Superplasticity may result from the fine grain size and the well-distributed SiC part icles during superplastic uniaxial tension. Moreover, the simple and c onvenient pretreatment used in this paper is easily applied to industr ial practice.