Dynamic precipitation, segregation and strengthening of an Al-Zn-Mg-Cu alloy (AA7075) processed by high-pressure torsion

Yidong Zhang, Shenbao Jin, Patrick W. Trimby, Xiaozhou Liao, Maxim Y. Murashkin, Ruslan Z. Valiev, Jizi Liu, Julie M. Cairney, Simon P. Ringer, Gang Sha

Research outputpeer-review

8 Citations (Scopus)

Abstract

Combining transmission Kikuchi diffraction, high resolution transmission electron microscopy and atom probe tomography, we investigated an Al-Zn-Mg-Cu alloy (AA7075) processed by high-pressure torsion (HPT) at room temperature and 200 °C, with an objective to reveal the deformation-induced precipitation and segregation of elements at grain boundaries, and to study their appearance at different processing regimes. Although HPT processing at the two temperatures both induced the formation of ŋ phase, ŋ precipitates formed at the two temperatures have different chemical compositions. The increase of the HPT processing temperature increased significantly segregation of Mg and Cu at grain boundaries. The HPT–induced segregation and decomposition of the alloy have a significant effect on its mechanical strength. Our results open a way for achieving advanced mechanical properties in nanostructured metals and alloys by designing their precipitation and segregation through the control of SPD processing regimes.

Original languageEnglish
Pages (from-to)19-32
Number of pages14
JournalActa Materialia
Volume162
DOIs
Publication statusPublished - 1 Jan 2019

Fingerprint

Strengthening (metal)
Torsional stress
Processing
Grain boundaries
Temperature
High resolution transmission electron microscopy
Strength of materials
Tomography
Precipitates
Diffraction
Metals
Decomposition
Atoms
Mechanical properties
Chemical analysis

Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Cite this

Zhang, Yidong ; Jin, Shenbao ; Trimby, Patrick W. ; Liao, Xiaozhou ; Murashkin, Maxim Y. ; Valiev, Ruslan Z. ; Liu, Jizi ; Cairney, Julie M. ; Ringer, Simon P. ; Sha, Gang. / Dynamic precipitation, segregation and strengthening of an Al-Zn-Mg-Cu alloy (AA7075) processed by high-pressure torsion. In: Acta Materialia. 2019 ; Vol. 162. pp. 19-32.
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Dynamic precipitation, segregation and strengthening of an Al-Zn-Mg-Cu alloy (AA7075) processed by high-pressure torsion. / Zhang, Yidong; Jin, Shenbao; Trimby, Patrick W.; Liao, Xiaozhou; Murashkin, Maxim Y.; Valiev, Ruslan Z.; Liu, Jizi; Cairney, Julie M.; Ringer, Simon P.; Sha, Gang.

In: Acta Materialia, Vol. 162, 01.01.2019, p. 19-32.

Research outputpeer-review

TY - JOUR

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AU - Jin, Shenbao

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AU - Murashkin, Maxim Y.

AU - Valiev, Ruslan Z.

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AU - Ringer, Simon P.

AU - Sha, Gang

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