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- 저자 : Mohammad Mazinani (검색결과 1 건)
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Mahzad Zohoori Tali,Mohammad Mazinani,Mahmoud Reza Ghandehari Ferdowsi,Gholam Reza Ebrahimi,Mohammad Marvi-Mashhadi 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.6
In order to evaluate the hot flow behaviour of AZ80 magnesium alloy containing 0.5 wt% rare earth elements,isothermal hot compression tests were conducted at the temperatures range of 250-450 °C under the strainrates of 0.001-1 s1. The flow curves exhibited a peak stress at a small applied strain after which the flowstresses decrease gradually to a steady state flow stress at higher applied strain values representing theoccurrence of dynamic recrystallization. Moreover, the material constants in the Zener-Hollomon constitutiveequation were found to be strain dependent, and the relationships between these parameters and theapplied true strain were well described by fourth-degree polynomial functions. Accordingly, a strain-dependentmodel was developed in order to predict the hot flow behaviour of AZ80+0.5RE magnesium alloy. The truestresses predicted by this model were found to be in good agreements with the experimental results. Furthermore,the constitutive model developed using the experimental results was incorporated in the finiteelement model with which the hot compressive flow curve of the investigated material was modeled. Theresults showed that the accuracy of flow curves calculated by the numerical simulations depends on theaccuracy of the developed model. In order to evaluate the hot flow behaviour of AZ80 magnesium alloy containing 0.5 wt% rare earth elements,isothermal hot compression tests were conducted at the temperatures range of 250-450 °C under the strainrates of 0.001-1 s1. The flow curves exhibited a peak stress at a small applied strain after which the flowstresses decrease gradually to a steady state flow stress at higher applied strain values representing theoccurrence of dynamic recrystallization. Moreover, the material constants in the Zener-Hollomon constitutiveequation were found to be strain dependent, and the relationships between these parameters and theapplied true strain were well described by fourth-degree polynomial functions. Accordingly, a strain-dependentmodel was developed in order to predict the hot flow behaviour of AZ80+0.5RE magnesium alloy. The truestresses predicted by this model were found to be in good agreements with the experimental results. Furthermore,the constitutive model developed using the experimental results was incorporated in the finiteelement model with which the hot compressive flow curve of the investigated material was modeled. Theresults showed that the accuracy of flow curves calculated by the numerical simulations depends on theaccuracy of the developed model.
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