Strengthening mechanisms in an ultrafine-grained Al-Zn-Mg-Cu alloy processed by high pressure torsion at different temperatures

Yidong Zhang, Shenbao Jin, Patrick Trimby, Xiaozhou Liao, Maxim Y. Murashkin, Ruslan Z. Valiev, Gang Sha

Research outputpeer-review

3 Citations (Scopus)

Abstract

The microstructures of an Al[sbnd]Zn[sbnd]Mg[sbnd]Cu alloy processed by high pressure torsion at room temperature and 200 °C were characterized by transmission Kikuchi diffraction and atom probe tomography. Hardening effects of different microstructural features including grain boundaries, dislocations and solute nanostructures were quantitatively calculated using existing models. Compared to the samples processed at room temperature, the samples deformed at 200 °C were of relative larger grain sizes, a lower dislocation density and more significant phase decomposition. Thus, the primary hardening effects, i.e. grain boundary hardening, dislocation hardening and cluster hardening subside at the elevated deformation temperature. Nevertheless, significant segregation of Mg and Cu formed at grain boundaries during deformation at 200 °C, which provides a remarkable hardening effect. The results revealed the importance of grain boundary chemistry on the mechanical strength of the ultrafine-grained materials.

Original languageEnglish
Pages (from-to)223-232
Number of pages10
JournalMaterials Science and Engineering A
Volume752
DOIs
Publication statusPublished - 3 Apr 2019

Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Materials Science(all)

Cite this

@article{36205d00f81c4e45ba5d1385cb7ae4a0,
title = "Strengthening mechanisms in an ultrafine-grained Al-Zn-Mg-Cu alloy processed by high pressure torsion at different temperatures",
abstract = "The microstructures of an Al[sbnd]Zn[sbnd]Mg[sbnd]Cu alloy processed by high pressure torsion at room temperature and 200 °C were characterized by transmission Kikuchi diffraction and atom probe tomography. Hardening effects of different microstructural features including grain boundaries, dislocations and solute nanostructures were quantitatively calculated using existing models. Compared to the samples processed at room temperature, the samples deformed at 200 °C were of relative larger grain sizes, a lower dislocation density and more significant phase decomposition. Thus, the primary hardening effects, i.e. grain boundary hardening, dislocation hardening and cluster hardening subside at the elevated deformation temperature. Nevertheless, significant segregation of Mg and Cu formed at grain boundaries during deformation at 200 °C, which provides a remarkable hardening effect. The results revealed the importance of grain boundary chemistry on the mechanical strength of the ultrafine-grained materials.",
keywords = "Al-Zn-Mg-Cu alloy, Atom probe tomography, High-pressure torsion, Strengthening mechanism, Transmission Kikuchi diffraction, CO-CLUSTERS, CRYSTAL-STRUCTURE, DYNAMIC RECRYSTALLIZATION, ALUMINUM-ALLOY, PRECIPITATION, SEVERE PLASTIC-DEFORMATION, HALL-PETCH RELATIONSHIP, STRAIN RATE SUPERPLASTICITY, SI ALLOY, MICROSTRUCTURE",
author = "Yidong Zhang and Shenbao Jin and Patrick Trimby and Xiaozhou Liao and Murashkin, {Maxim Y.} and Valiev, {Ruslan Z.} and Gang Sha",
year = "2019",
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doi = "10.1016/j.msea.2019.02.094",
language = "English",
volume = "752",
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Strengthening mechanisms in an ultrafine-grained Al-Zn-Mg-Cu alloy processed by high pressure torsion at different temperatures. / Zhang, Yidong; Jin, Shenbao; Trimby, Patrick; Liao, Xiaozhou; Murashkin, Maxim Y.; Valiev, Ruslan Z.; Sha, Gang.

In: Materials Science and Engineering A, Vol. 752, 03.04.2019, p. 223-232.

Research outputpeer-review

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T1 - Strengthening mechanisms in an ultrafine-grained Al-Zn-Mg-Cu alloy processed by high pressure torsion at different temperatures

AU - Zhang, Yidong

AU - Jin, Shenbao

AU - Trimby, Patrick

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AU - Murashkin, Maxim Y.

AU - Valiev, Ruslan Z.

AU - Sha, Gang

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N2 - The microstructures of an Al[sbnd]Zn[sbnd]Mg[sbnd]Cu alloy processed by high pressure torsion at room temperature and 200 °C were characterized by transmission Kikuchi diffraction and atom probe tomography. Hardening effects of different microstructural features including grain boundaries, dislocations and solute nanostructures were quantitatively calculated using existing models. Compared to the samples processed at room temperature, the samples deformed at 200 °C were of relative larger grain sizes, a lower dislocation density and more significant phase decomposition. Thus, the primary hardening effects, i.e. grain boundary hardening, dislocation hardening and cluster hardening subside at the elevated deformation temperature. Nevertheless, significant segregation of Mg and Cu formed at grain boundaries during deformation at 200 °C, which provides a remarkable hardening effect. The results revealed the importance of grain boundary chemistry on the mechanical strength of the ultrafine-grained materials.

AB - The microstructures of an Al[sbnd]Zn[sbnd]Mg[sbnd]Cu alloy processed by high pressure torsion at room temperature and 200 °C were characterized by transmission Kikuchi diffraction and atom probe tomography. Hardening effects of different microstructural features including grain boundaries, dislocations and solute nanostructures were quantitatively calculated using existing models. Compared to the samples processed at room temperature, the samples deformed at 200 °C were of relative larger grain sizes, a lower dislocation density and more significant phase decomposition. Thus, the primary hardening effects, i.e. grain boundary hardening, dislocation hardening and cluster hardening subside at the elevated deformation temperature. Nevertheless, significant segregation of Mg and Cu formed at grain boundaries during deformation at 200 °C, which provides a remarkable hardening effect. The results revealed the importance of grain boundary chemistry on the mechanical strength of the ultrafine-grained materials.

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