Age hardening and thermal stability of Al-Cu alloy processed by high-pressure torsion

Intan Fadhlina Binti Mohamed, Yosuke Yonenaga, Seungwon Lee, Kaveh Edalati, Zenji Horita

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

An age-hardenable Al-4. wt% Cu alloy is severely deformed using high-pressure torsion (HPT) to refine the microstructure to an average gain size of ~210. nm. High saturation hardness of 205. Hv and high tensile strength of 820. MPa are achieved after the HPT processing. It is shown that the strength of the HPT-processed alloy is further improved by natural aging at room temperature or by artificial aging at 353. K. A peak hardness followed by softening appears within a few days after natural aging and within a few minutes after aging at 353. K, suggesting the low thermal stability of the alloy. Quantitative evaluation of different strengthening mechanisms shows that the grain boundary hardening through the Hall-Petch relationship and the precipitation hardening through the Orowan relationship are dominant strengthening mechanisms.

Original languageEnglish
Pages (from-to)111-118
Number of pages8
JournalMaterials Science and Engineering A
Volume627
DOIs
Publication statusPublished - Mar 1 2015

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precipitation hardening
Age hardening
Torsional stress
torsion
Thermodynamic stability
thermal stability
Aging of materials
Strengthening (metal)
hardness
Hardness
hardening
softening
tensile strength
Hardening
Grain boundaries
Tensile strength
grain boundaries
saturation
microstructure
Microstructure

All Science Journal Classification (ASJC) codes

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

Cite this

Age hardening and thermal stability of Al-Cu alloy processed by high-pressure torsion. / Mohamed, Intan Fadhlina Binti; Yonenaga, Yosuke; Lee, Seungwon; Edalati, Kaveh; Horita, Zenji.

In: Materials Science and Engineering A, Vol. 627, 01.03.2015, p. 111-118.

Research output: Contribution to journalArticle

Mohamed, Intan Fadhlina Binti ; Yonenaga, Yosuke ; Lee, Seungwon ; Edalati, Kaveh ; Horita, Zenji. / Age hardening and thermal stability of Al-Cu alloy processed by high-pressure torsion. In: Materials Science and Engineering A. 2015 ; Vol. 627. pp. 111-118.
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