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

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Abstract

Abstract: The abnormal behavior of monotonicstress-strain curves of aluminum alloys induced by the yield drop withincreasing strain rate or decreasing temperature is considered based onthe relaxation model of plasticity. The plastic deformation of 2519A and2519A-T87 aluminum alloys within the strain rate range from 0.001 to6000 s–1 and temperature range from –45 to 450°С is analyzedfrom the standpoint of determining the structural and temporalcharacteristics of the material invariant to the strain rate. It isproposed to determine the change in the structural and temporalcharacteristics caused by the test temperature choice by analyzing a setof strain rate dependences of the material constructed at a fixedtemperature. The temperature dependences of the characteristicrelaxation time as a rate sensitivity factor of the relaxationplasticity model are compared for 2519A and 2519A-T87 aluminum alloys.Theoretical nonmonotonic stress-strain curves in a wide strain raterange of 0.001–6000 s–1 are constructed at –45, 0, 20, 150°С,and nonmonotonic stress-strain curves at a fixed strain rate of4300 s–1 are plotted at temperatures of 150, 300, 450°С. Therelaxation model of plasticity is shown to predict the yield stresswithin a wide range of temperatures and strain rates in accordance withthe temperature-time superposition principle. The model also identifiesthe temperature-strain rate conditions of deformation in which monotoniccurves (without the yield drop) are not observed with increasing strainrate.

Original languageEnglish
Pages (from-to)487-493
Number of pages7
JournalPhysical Mesomechanics
Volume23
Issue number6
DOIs
StatePublished - Nov 2020

Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Surfaces and Interfaces

Keywords

  • 2519A aluminum alloy
  • Characteristic relaxation time
  • Relaxation model of plasticity
  • Yield drop

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