Kinematics of Portevin–Le Chatelier bands in simple shear

Thermomechanical characterization of Portevin–Le Châtelier bands in AlMg3 (AA5754) and modeling based on a modified Estrin–McCormick approach

“…Benallal et al (2006Benallal et al ( , 2008) employed a phenomenological elastic-viscoplastic model based on the work of Penning (1972) for the FE-based simulation of the PLC effect in unnotched and notched axisymmetric tensile specimens at different strain rates. More recently, Manach et al (2014) modeled PLC band behavior in simple shear with the model of McCormick and Ling (1995) as well as a Johnson-Cook type model.…”

“…With respect to the temperature-dependence of SRS, Pandey et al (2013) found that SRS in AA5754 changes from negative to positive above temperatures of 423 K during uniaxial loading. Under shear loading, the temperature of this transition was reported to depend strongly on loading conditions (e.g., see also Manach et al, 2014). Halim et al (2007) found that PLC band type is determined by the distribution of solute atoms and dislocations in the material, and is unrelated to Lüders band formation.…”

Serrated Yielding: Crystal Viscoplastic Models

“…На микроскопическом уровне эффект ПЛШ, как предполагается в работах [8,20,47,48,55,56,59,60,65,71,81], связан с динамическим деформационным старением, обу-словленным взаимодействием между подвижными дислокациями, временно остановив-шимися на препятствиях (дислокациях леса или других дефектах), и диффундирующими атомами примеси, которые дополнительно закрепляют дислокации.…”

“…В работе [81] представлены результаты экспериментальных и численных исследова-ний эффекта ПЛШ при простом сдвиге в Al-Mg сплаве при различных скоростях дефор-мации и температурах. Прямые наблюдения поверхности образца с использованием ме-тода корреляции цифровых изображений позволили выявить различные типы полос де-формации в зависимости от напряжений и скорости деформации.…”

Multiscale characterization of dislocation processes in Al 5754

“…Macroscopically, the deformation of Al-Mg alloys has been well characterized with experiments establishing the stress/strain behaviour while varying experimental conditions such as strain rate and temperature [5][6][7][8][9][10]. However, little in the way of direct experimental characterization of the dislocation interactions during deformation in these alloys has been reported in the literature.…”