کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7220869 1470338 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hot tensile deformation behaviors and constitutive model of an Al-Zn-Mg-Cu alloy
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
Hot tensile deformation behaviors and constitutive model of an Al-Zn-Mg-Cu alloy
چکیده انگلیسی
The hot tensile deformation behaviors of an Al-Zn-Mg-Cu alloy are studied by uniaxial tensile tests under the deformation temperature of 340-460 °C and strain rate of 0.01-0.001 s−1. The effects of deformation temperature and strain rate on the hot tensile deformation behaviors and fracture characteristics are discussed in detail. The Arrhenius-type constitutive model is developed to predict the peak stress under the tested deformation condition. The results show that: (1) The true stress-true strain curves under all the tested deformation conditions are composed of four distinct stages, i.e., elastic stage, uniform deformation stage, diffusion necking stage and localized necking stage. The flow stress decreases with the increase of deformation temperature or the decrease of strain rate. (2) The elongation to fracture increases with the increase of deformation temperature. Under the tested conditions, the strain rate sensitivity coefficient varies between 0.1248 and 0.2059, which indicates that the main deformation mechanism is the lattice diffusion-controlled dislocation climb. (3) The localized necking causes the final fracture of specimens under all the deformation conditions. Microvoids coalescence is the main fracture mechanism under relatively low deformation temperatures. With the increase of deformation temperature, the intergranular fracture occurs. (4) The peak stresses predicted by the developed model well agree with the experimental results, which indicate the validity of the developed model.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials & Design - Volume 59, July 2014, Pages 141-150
نویسندگان
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