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Prediction of the Temperature-Time Effects of Irreversible Deformation for 2519A Aluminum Alloy

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Abstract

The abnormal behavior of monotonic stress-strain curves of aluminum alloys induced by the yield drop with increasing strain rate or decreasing temperature is considered based on the relaxation model of plasticity. The plastic deformation of 2519A and 2519A-T87 aluminum alloys within the strain rate range from 0.001 to 6000 s–1 and temperature range from –45 to 450°С is analyzed from the standpoint of determining the structural and temporal characteristics of the material invariant to the strain rate. It is proposed to determine the change in the structural and temporal characteristics caused by the test temperature choice by analyzing a set of strain rate dependences of the material constructed at a fixed temperature. The temperature dependences of the characteristic relaxation time as a rate sensitivity factor of the relaxation plasticity model are compared for 2519A and 2519A-T87 aluminum alloys. Theoretical nonmonotonic stress-strain curves in a wide strain rate range of 0.001–6000 s–1 are constructed at –45, 0, 20, 150°С, and nonmonotonic stress-strain curves at a fixed strain rate of 4300 s–1 are plotted at temperatures of 150, 300, 450°С. The relaxation model of plasticity is shown to predict the yield stress within a wide range of temperatures and strain rates in accordance with the temperature-time superposition principle. The model also identifies the temperature-strain rate conditions of deformation in which monotonic curves (without the yield drop) are not observed with increasing strain rate.

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The work was performed at the support of the Russian Science Foundation (Project 19-71-00093).

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Correspondence to N. S. Selyutina.

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Russian Text © The Author(s), 2019, published in Fizicheskaya Mezomekhanika, 2020, Vol. 23, No. 1, pp. 33–40.

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Selyutina, N.S. Prediction of the Temperature-Time Effects of Irreversible Deformation for 2519A Aluminum Alloy. Phys Mesomech 23, 487–493 (2020). https://doi.org/10.1134/S1029959920060041

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  • DOI: https://doi.org/10.1134/S1029959920060041

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