Applied Sciences (May 2021)

Flow Stress Modelling and 3D Processing Maps of Al4.5Zn4.5Mg1Cu0.12Zr Alloy with Different Scandium Contents

  • Maxim G. Khomutov,
  • Andrey V. Pozdniakov,
  • Alexander Yu. Churyumov,
  • Ruslan Yu. Barkov,
  • Alexey N. Solonin,
  • Maria V. Glavatskikh

DOI
https://doi.org/10.3390/app11104587
Journal volume & issue
Vol. 11, no. 10
p. 4587

Abstract

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The hot deformation behaviour of an Al4.5Zn4.5Mg1Cu0.12Zr based alloy with 0.05, 0.1 and 0.15% Sc was investigated at temperatures between 300–450 °C and a strain rate of 0.1–15 s−1. The materials constants of a flow stress model based on the Zener-Hollomon parameter were determined (AARE was 5.8%). Three-dimensional processing maps were established by combining power dissipation efficiency and flow stability diagrams. Based on processing maps analysis and microstructures investigations, the optimal deformation parameters were determined as a temperature range of 350–400 °C and strain rates of 0.1–1 s−1 for the alloys with 0.05% and 0.1% Sc, and 0.1 s−1 for the alloy with 0.15% Sc.

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