Strengthening of AA7075 alloy by processing with high-pressure sliding (HPS) and subsequent aging

Seungwon Lee, Kiyonari Tazoe, Mohamed Intan Fadhlina, Zenji Horita

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

High-pressure sliding (HPS) is a new severe plastic deformation process for sheet samples under high-pressure. In this study, the HPS process is applied to an age-hardenable 7075 aluminum alloy for grain refinement. HPS was conducted under a pressure of 1.0. GPa for sliding distances of 7.0. mm at room temperature and for 10. mm at 373. K and 423. K, and thus the average grain size was reduced to ~280. nm, ~240. nm and ~250. nm. Ultimate tensile strength of ~600. MPa was achieved by this grain refinement. Aging at 373. K led to further hardening to 745. MPa of ultimate tensile strength with 4% of elongation to fracture through a fine dispersion of precipitates. It is shown that simultaneous strengthening due to grain refinement and fine precipitation is achieved in the AA7075 by application of HPS and subsequent aging.

Original languageEnglish
Pages (from-to)56-61
Number of pages6
JournalMaterials Science and Engineering A
Volume628
DOIs
Publication statusPublished - 5 Mar 2015
Externally publishedYes

Fingerprint

Strengthening (metal)
sliding
Aging of materials
Grain refinement
Processing
tensile strength
Tensile strength
hardening
aluminum alloys
elongation
plastic deformation
precipitates
grain size
Hardening
Precipitates
Elongation
Aluminum alloys
Plastic deformation
room temperature

Keywords

  • Age-hardening
  • Dispersed precipitates
  • Grain refinement
  • High-pressure sliding
  • Severe plastic deformation

ASJC Scopus subject areas

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

Cite this

Strengthening of AA7075 alloy by processing with high-pressure sliding (HPS) and subsequent aging. / Lee, Seungwon; Tazoe, Kiyonari; Intan Fadhlina, Mohamed; Horita, Zenji.

In: Materials Science and Engineering A, Vol. 628, 05.03.2015, p. 56-61.

Research output: Contribution to journalArticle

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AB - High-pressure sliding (HPS) is a new severe plastic deformation process for sheet samples under high-pressure. In this study, the HPS process is applied to an age-hardenable 7075 aluminum alloy for grain refinement. HPS was conducted under a pressure of 1.0. GPa for sliding distances of 7.0. mm at room temperature and for 10. mm at 373. K and 423. K, and thus the average grain size was reduced to ~280. nm, ~240. nm and ~250. nm. Ultimate tensile strength of ~600. MPa was achieved by this grain refinement. Aging at 373. K led to further hardening to 745. MPa of ultimate tensile strength with 4% of elongation to fracture through a fine dispersion of precipitates. It is shown that simultaneous strengthening due to grain refinement and fine precipitation is achieved in the AA7075 by application of HPS and subsequent aging.

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