Modelling and Simulation of Strain Resistance of Alloys Taking into Account Barrier Effects

A. S. Smirnov; A. V. Konovalov; O. Yu. Muizemnek

doi:10.17804/2410-9908.2015.1.061-072

A. S. Smirnov, A. V. Konovalov, O. Yu. Muizemnek

MODELLING AND SIMULATION OF STRAIN RESISTANCE OF ALLOYS TAKING INTO ACCOUNT BARRIER EFFECTS

DOI: 10.17804/2410-9908.2015.1.061-072

The paper proposes a model of strain resistance of alloy under high-temperature deformation. The model describes hardening of alloy due to the increase of dislocation density, as well as the barrier effect of blocking free dislocations, boundaries of grains and subgrains by dispersoids. The model also takes into account the softening processes associated with the recovery and dynamic recrystallization. The model has been tested on the rheological behavior of an Al-Mg alloy named AMg6 at temperatures of 400 and 500 ºC in the range of strain rates from 5 to 25 s^-1. It was found in this temperature – strain rate range that the curve of strain resistance of the AMg6 alloy consists of several portions. First there is hardening of the material, then there is material softening, which is again replaced by hardening of the material. With the use of the electron backscatter diffraction technique and transmission electron microscopy, it was found that the main process of softening at investigated temperatures is dynamic recrystallization. The appearance of the second portion of hardening on the strain resistance curve is the inhibition of dynamic recrystallization, as well as manifestation of the barrier effect of blocking free dislocations, grain and subgrain boundaries by dispersoids.

Keywords: Al-Mg alloy, AMg6, strain resistance model, strain resistance, rheology, high temperature deformation, recrystallization, microstructure, dispersoids, barrier effect.

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А. С. Смирнов, А. В. Коновалов, О. Ю. Муйземнек

МОДЕЛИРОВАНИЕ СОПРОТИВЛЕНИЯ ДЕФОРМАЦИИ СПЛАВОВ С УЧЕТОМ БАРЬЕРНЫХ ЭФФЕКТОВ

В работе предложена модель сопротивления деформации сплавов в условиях высокотемпературных деформаций. Модель учитывает упрочнение сплава за счет приращения плотности дислокаций, а также барьерного эффекта блокирования свободных дислокаций, роста границ зерен и субзерен. Также в модели учитываются процессы разупрочнения, связанные с прохождением возврата и динамической рекристаллизации. Модель апробирована на примере реологического поведения Аl-Mg сплава АМг6 при температурах 400 и 500 °С в диапазоне скоростей деформаций 5 – 25 с - 1. В данном температурно-скоростном диапазоне было установлено, что кривая сопротивления деформации сплава АМг6 состоит из нескольких участков. Вначале идет упрочнение материала, затем его разупрочнение, которое опять сменяется упрочнением материала. Используя метод дифракции обратнорассеянных электронов и просвечивающую электронную микроскопию, было выяснено, что основным процессом разупрочнения при исследуемых температурах является динамическая рекристаллизация. Причинами появления второго участка упрочнения на кривой сопротивления деформации является замедление процесса динамической рекристаллизации, а также проявление барьерного эффекта блокирования интерметаллидами свободных дисклокаций, границ зерен и субзерен.

Ключевые слова: Al-Mg сплав, АМг6, модель сопротивления деформации, сопротивление деформации, реология, высокотемпературная деформация, рекристаллизация, микроструктура, интерметаллиды, барьерный эффект

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Библиографическая ссылка на статью

Smirnov A. S., Konovalov A. V., Muizemnek O. Yu. Modelling and Simulation of Strain Resistance of Alloys Taking into Account Barrier Effects // Diagnostics, Resource and Mechanics of materials and structures. - 2015. - Iss. 1. - P. 61-72. -
DOI: 10.17804/2410-9908.2015.1.061-072. -
URL: http://dream-journal.org/issues/2015-1/2015-1_18.html
(accessed: 20.04.2024).