| Hot workability of aluminum alloys, 2024, 6061 and 7075, has been studied by hot torsion tests at temperatures from 320 to 515℃ and at strain rates from 1.26×10^(-3) to 5.71×10^(-3) sec^(-1). Hot working condition of these aluminum alloys was determined quantitatively from the constitutive equations obtained from flow stress curves in torsion. Experimental data of the logarith of the Zener-Hollomonn parameter showed good linear relationships to the logarith of sinh (aδ(-)). The constitutive equations of aluminum alloys, 2024, 6061 and 7075 were expressed as ε=2.71×10^(12) (sinh 0.0142δ(-)^(5.54) exp (-212/RT), ε=6.91×10^(10) (sinh 0.0108δ(-))^(5.47) exp (-163/RT) and ε=4.8l×10^(10) (sinh 0.0088δ(-))^(5.00) exp (-165/RT), respectively. The flow data of the aluminum alloys could also be well fitted to the power law δ(-)=Bε^(x)｜e,T- |
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