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مواد و طراحی
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • constitutive base analysis of a 7075 aluminum alloy during hot compression testing

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    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 593
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     in the field of deformation process modeling, the constitutive equations may properly represent the flow behavior of the materials. in fact, these valuable relationships are used as a calculation basis to simulate the materials flow responses. accordingly, in the present study a hot working constitutive base analysis has been conducted on a 7075 aluminum alloy. this has been performed using the stress–strain data obtained from isothermal hot compression tests at constant strain rates of 0.004, 0.04 and 0.4 s−1 and deformation temperatures of 450, 500, 520, 550 and 580 °c up to a 40% height reduction of the specimen. a set of constitutive equations for 7075 al alloy have been proposed employing an exponent-type equation. the related material constants (i.e., a, n and α) as well as the activation energy q for each temperature regime have been determined. the correlation of flow stress to strain rate and temperature can be deduced from the proposed equations. furthermore, a change in deformation mechanism has been realized in the semi-solid temperature range. this has been related to the onset of lubricated flow mechanism during processing.

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