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Superplasticity of high-strength Al-based alloys produced by thermomechanical treatment
Journal of Alloys and Compounds. 2016. Vol. 688. P. 336–344.
Highlights
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Superplastic behaviour and the microstructural evolution were investigated.
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Alloy with Al3(Sc,Zr) particles and alloy containing Al3Zr and Al3Ni particles.
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Alloy with Ni and Zr exhibits a 1.5–2 times finer grains during deformation.
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Al3Ni particles provide a larger number of nuclei for recrystallization.
Abstract
The superplastic properties of two high strength aluminium alloys are investigated. The first alloy contains fine, coherent Al3(Zr,Sc) particles, and the second alloy contains both fine, coherent Al3Zr particles and coarse, eutectic Al3Ni particles. Due to its fine, stable grain structure, the alloy containing both Al3Zr and Al3Ni particles exhibits significantly better superplastic properties. The superplastic behaviour in tension under both constant and initial strain rates was compared, and the effective activation energy of superplastic deformation was calculated. The alloy containing both fine and coarse particles exhibit 1100%–1200% elongation at strain rates of 1 × 10−2 s−1–1 × 10−1 s−1 and temperature of 440 °C.
Keywords: superplasticityaluminium alloysSuperplastic formingactivation energyFine grain structureParticles stimulated nucleation
Publication based on the results of:
Mikolaenko V., Анохин В. В., Кудряшов М. Д., В кн.: Межвузовская научно-техническая конференция студентов, аспирантов и молодых специалистов имени Е.В. Арменского. Материалы конференции.: М.: МИЭМ НИУ ВШЭ, 2022.
Сверхпластическая газовая формовка – это один из способов обработки материалов давлением, используемый при производстве тонкостенных изделий сложной геометрической формы. Для проектирования технологических режимов производства таких изделий используется компьютерное моделирование технологического процесса, для которого необходимо задать свойства материала. Основной экспериментальный метод исследования свойств сверхпластичных материалов – одноосное растяжение плоских образцов с постоянной скоростью деформации. Однако, стандартная ...
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The design of superplastic forming technologies requires accurate description of material flow behaviour. Furthermore, as the flow curves reflect the deformation mechanisms and microstructure evolution of a material, their accurate determination is an important aspect of material science. The standard experimental method for determining superplastic flow curves is the tensile test, which encounters a significant ...
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Листовые заготовки из сверхпластичных материалов используются в технологиях сверхпластической газовой формовки для производства тонкостенных изделий сложной геометрической формы. При реализации такой технологии необходимо корректно задать режим давления и температуры, чтобы заготовка вошла в состояние сверхпластичности, при котором возможно её бездефектное формоизменение при больших деформациях. Режим давления и температуры устанавливаются исходя из модели деформационного поведения материала, ...
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Mikolaenko V., В кн.: Материалы конференции. Межвузовская научно-техническая конференция студентов, аспирантов и молодых специалистов им. Е.В. Арменского.: М.: МИЭМ НИУ ВШЭ, 2020. С. 16–18.
Работа посвящена компьютерному моделированию пластического формоизменения материала в условиях, близких к плоско-деформированному состоянию. Для моделирования такой задачи предлагается использовать метод конечных элементов с геометрическими ограничениями на элементы, что позволит учесть уширение образца, не прибегая к увеличению числа элементов при переходе от плоского моделирования к трехмерному. В рамках данной работы такой подход реализован в программных компонентах, ...
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Применение эффекта сверхпластичности при реализации процессов обработки материалов давлением позволяет осуществлять бездефектное формоизменение листовых заготовок для получения оболочечных деталей сложной геометрической формы. Данный эффект возникает в специальных и промышленных сплавах на основе титана и алюминия. При разработке новых сплавов, обладающих эффектом сверхпластичности, особое внимание уделяется их деформационному поведению при повышенных температурах. Модель, описывающая деформационное поведение ...
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