Superplasticity and High Strength in Al–Zn–Mg–Zr Alloy with Ultrafine Grains

Ruslan Z. Valiev, Vil U. Kazykhanov, Aydar M. Mavlyutov, Anna A. Yudakhina, Nguyen Q. Chinh, Maxim Yu Murashkin

Research output: Contribution to journalArticle

Abstract

Herein, the ultrafine-grained (UFG) 7xxx series alloy Al–4.8Zn–1.2Mg–0.14Zr demonstrates superplasticity at unusually low temperatures of 120–170 °C while maintaining its high-strength state. The UFG structure is formed by high pressure torsion (HPT) at room temperature (RT), which leads to a considerable increase in the strength characteristics by ≈60% compared with the material after conventional heat treatment T6. It is found that the UFG alloy exhibits thermostability when testing or annealing up to 170 °C. Deforming by tensile test at a strain rate of 10−4 s−1 and 10−3 s−1, the elongation to failure at 120 and 170 °C exceeds 250% and 500%, respectively, whereas the strain rate sensitivity reaches 0.45, which is a typical value characterizing superplastic deformation. After superplastic deformation, the UFG alloy maintains 25–50% higher strength characteristics at RT than that after conventional heat treatment T6. The origin of such superior behavior of the UFG alloy is discussed.

Original languageEnglish
Article number1900555
JournalAdvanced Engineering Materials
Volume22
Issue number1
DOIs
Publication statusPublished - Jan 1 2020

Keywords

  • Al alloys
  • high strength
  • severe plastic deformation
  • superplasticity
  • ultrafine structures

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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    Valiev, R. Z., Kazykhanov, V. U., Mavlyutov, A. M., Yudakhina, A. A., Chinh, N. Q., & Murashkin, M. Y. (2020). Superplasticity and High Strength in Al–Zn–Mg–Zr Alloy with Ultrafine Grains. Advanced Engineering Materials, 22(1), [1900555]. https://doi.org/10.1002/adem.201900555