The metal matrix composites 2618-10%Al2O3 and 2618-20%Al2O3 have been subjected to hot torsion testsfor temperatures T from 300 to 500°C and strain rates ε from 0.1 to 5 S-l. The flow stresses decrease with increasing temperature and decreasing strain rate and the composites have greater strength than the matrix alloy. The strength of the extruded 2618-10%Al2O3 is higher than that of the as cast 2618-20%Al2O3. A constitutive analysis has been carried out with the sinh Arrhenius equation for the composites and the alloy. Plots of log ε versus log(sinh a(ασp) and log(sinh αςp) versus 1/T are approximately linear over the range of conditions tested. To improve the deformation processing, which is requiredfor many discontinuously reinforced metal matrix composites, the extrusion of the three materials has been modelled using the finite element software Deform and the constitutive laws determined above. Of particular significance are the dependences of peak load and maximum temperature on billet temperature and ram speed for an extrusion ratio of 31.
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