limЛитье и металлургияLitiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY)1683-60652414-0406BNTU10.21122/1683-6065-2022-2-84-90lim-3463Research ArticleМатериаловедениеScience of materialsИзмерение пластичности алюминиевых сплавов при их динамическом и статическом нагружении пирамидой ВиккерсаMeasurement of aluminum alloys plasticity under their dynamic and static loading by the Vickers pyramidКреньА. П.KrenA. P.

г. Минск, ул. Академическая, 16.

alekspk@mail.ruИнститут прикладной физики НАН БеларусиБеларусьInstitute of Applied Physics of the National Academy of Sciences of BelarusBelarus202231052022028490Copyright © Крень А.П., 20222022Крень А.П.Kren A.P.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://lim.bntu.by/jour/article/view/3463

В работе рассмотрена возможность оценки пластичности алюминиевых сплавов и алюмоматричных композитов методом квазистатического и микроударного индентирования при предударных скоростях в диапазоне 1–3 м/с. Предложено использовать при испытаниях пирамидальный индентор Виккерса, позволяющий создать постоянную величину деформации. Установлены характерные значения пластичности для промышленных алюминиевых сплавов и алюмоматричных композитов системы Al‑Fe‑Cr δ=0,83–0,98. Показано влияние скорости деформации на коэффициент динамичности Kd, представляющий собой отношение динамической и статической твердости. Установлено, что увеличение Kd для алюмоматричных композитов более значительно, чем для других материалов. При этом известное выражение, связывающее пластичность с другими механическими характеристиками (твердостью HV и модулем упругости E), для исследованных алюмоматричных композитов не выполняется. Разность значений δ, рассчитанная исходя из параметров отпечатка и как функции E/HV, может служить дополнительным признаком атипичности поведения материалов при деформировании.

The paper considers the possibility of assessing the plasticity of aluminum alloys and aluminum matrix composites by the method of quasi‑static and micro‑impact indentation at pre‑impact velocities in the range of 1–3 m/s. It is proposed to use a pyramidal Vickers indenter for testing, which allows creating a constant amount of deformation. The characteristic plasticity values for industrial aluminum alloys and aluminum matrix composites of the Al‑Fe‑Cr system δ=0.83–0.98 are established. The influence of the deformation rate on the dynamicity coefficient Kd, which is the ratio of dynamic and static hardness, is shown. It was found that the increase in Kd for aluminum matrix composites is more significant than for other materials. At the same time, the well‑known expression linking plasticity with other mechanical characteristics: hardness HV and modulus of elasticity E, is not fulfilled for the studied aluminum matrix composites. The difference in the values of δ, calculated based on the parameters of the print and as a function of E/HV, can serve as an additional sign of the atypical behavior of materials during deformation.

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The authors declare that there are no conflicts of interest present.