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摘要
The elevated temperature mechanical behaviors of aluminum alloys produced by squeeze casting process were studied using the physical simulation system Gleeble-1500D. A series of true stress-strain curves under temperatures ranging from 300 to 500 degrees C and strain rates ranging from 0.001 to 0.1 s(-1) were obtained for the materials produced under different squeeze pressures (25, 50 and 75 MPa). Based on the experimental results, an elastic-viscoplastic constitutive model for describing the stress-strain relationship before and in the steady flow state was developed, and the mathematic expressions of several key model parameters were given. It is shown that the predictions by the model are in good agreement with the experimental data.
