Work-softening behavior of the ultrafine-grained Al alloy processed by high-strain-rate, dissimilar-channel angular pressing

Jae-chul Lee, Jin Yoo Suh, Jae Pyung Ahn

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Commercially pure Al alloy sheets were processed using high-strain-rate, dissimilar-channel angular pressing (DCAP) for as many as 100 passages through a channel with φ = 120 deg, to investigate the work hardening caused by a low strain level (ε < 2) and the work softening caused by an extremely high strain level (3 < ε < 58). The hardness of the alloy increased significantly by a factor of 2 at strains less than ∼2, while a gradual decrease in the hardness was observed at strains greater then ∼2. The work-hardening and the work-softening behaviors observed from the Al alloy were analyzed by correlating the measured properties with microstructural evolutions observed by transmission electron microscopy (TEM). A detailed microstructural-evolution sequence occurring at successive strain stages was also investigated based on TEM and electron backscattered diffraction (EBSD).

Original languageEnglish
Pages (from-to)625-632
Number of pages8
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume34 A
Issue number3
Publication statusPublished - 2003 Mar 1
Externally publishedYes

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Strain rate
Microstructural evolution
Strain hardening
Hardness
Transmission electron microscopy
Electron diffraction
Ultrafine

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

Cite this

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abstract = "Commercially pure Al alloy sheets were processed using high-strain-rate, dissimilar-channel angular pressing (DCAP) for as many as 100 passages through a channel with φ = 120 deg, to investigate the work hardening caused by a low strain level (ε < 2) and the work softening caused by an extremely high strain level (3 < ε < 58). The hardness of the alloy increased significantly by a factor of 2 at strains less than ∼2, while a gradual decrease in the hardness was observed at strains greater then ∼2. The work-hardening and the work-softening behaviors observed from the Al alloy were analyzed by correlating the measured properties with microstructural evolutions observed by transmission electron microscopy (TEM). A detailed microstructural-evolution sequence occurring at successive strain stages was also investigated based on TEM and electron backscattered diffraction (EBSD).",
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