A unified constitutive model based on dislocation density for an Al-Zn-Mg-Cu alloy at time-variant hot deformation conditions

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 718; pp. 165 - 172
• Main Authors: Lin, Y.C., Dong, Wen-Yong, Zhou, Mi, Wen, Dong-Xu, Chen, Dong-Dong
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 07.03.2018; Elsevier BV
• Subjects: Alloy; Aluminum base alloys; Constitutive model; Constitutive models; Copper; Deformation; Deformation mechanism; Deformation mechanisms; Dislocation density; Flow behavior; Hardening rate; High temperature; Iterative methods; Magnesium base alloys; Mathematical models; Strain rate; Studies; Tensile tests; Work hardening; Yield strength; Zinc; Constitutive model; Flow behavior; Alloy; Deformation mechanism

In order to study the flow behaviors of an Al-Zn-Mg-Cu alloy at elevated temperatures, uniaxial tensile tests were carried out in wide deformation temperature and strain rate ranges. The flow stress rapidly increases to a peak value and then slightly decreases with the increased strain, and the dyna...