High strain rate superplasticity of submicrometer grained 5083 Al alloy containing scandium fabricated by severe plastic deformation

Kyung Tae Park, Duck Young Hwang, Young-Kook Lee, Young Kuk Kim, Dong Hyuk Shin

Research output: Contribution to journalArticle

105 Citations (Scopus)

Abstract

High strain rate superplasticity (HSRS) was obtained in a commercial 5083 Al alloy by introducing a ultrafine grained structure of 0.3 μm through severe plastic deformation and by adding a dilute amount of scandium (Sc) as a microstructure stabilizer. Tensile tests were carried out on the as-processed sample at temperatures of 623-823 K and initial strain rates of 1 × 10-3-1 × 100s-1. The maximum elongation to failure of 740% was obtained at 773 K and 1 × 10-2s-1. HSRS of the alloy was attributed to the combined effects of dynamic recrystallization and preservation of fine recrystallized grains by the presence of Sc. The mechanical behavior of the alloy at 773 K was characterized by a sigmoidal behavior in a plot of stress vs strain rate in the double logarithmic scale. The origin of the sigmoidal behavior was discussed in terms of microstructural evolution during superplastic deformation. An examination of the fractured samples revealed that failure occurred in a brittle manner related to cavitation rather than necking. Cavity stringers were formed parallel to the tensile axis by interlinkage of jagged-shaped isolated cavities along grain boundaries aligned to the tensile axis.

Original languageEnglish
Pages (from-to)273-281
Number of pages9
JournalMaterials Science and Engineering A
Volume341
Issue number1-2
DOIs
Publication statusPublished - 2003 Jan 20

Fingerprint

Scandium
superplasticity
Superplasticity
scandium
plastic deformation
strain rate
Strain rate
Plastic deformation
stringers
Superplastic deformation
Stringers
cavities
Dynamic recrystallization
Microstructural evolution
tensile tests
cavitation flow
Cavitation
elongation
Elongation
Grain boundaries

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "High strain rate superplasticity of submicrometer grained 5083 Al alloy containing scandium fabricated by severe plastic deformation",
abstract = "High strain rate superplasticity (HSRS) was obtained in a commercial 5083 Al alloy by introducing a ultrafine grained structure of 0.3 μm through severe plastic deformation and by adding a dilute amount of scandium (Sc) as a microstructure stabilizer. Tensile tests were carried out on the as-processed sample at temperatures of 623-823 K and initial strain rates of 1 × 10-3-1 × 100s-1. The maximum elongation to failure of 740{\%} was obtained at 773 K and 1 × 10-2s-1. HSRS of the alloy was attributed to the combined effects of dynamic recrystallization and preservation of fine recrystallized grains by the presence of Sc. The mechanical behavior of the alloy at 773 K was characterized by a sigmoidal behavior in a plot of stress vs strain rate in the double logarithmic scale. The origin of the sigmoidal behavior was discussed in terms of microstructural evolution during superplastic deformation. An examination of the fractured samples revealed that failure occurred in a brittle manner related to cavitation rather than necking. Cavity stringers were formed parallel to the tensile axis by interlinkage of jagged-shaped isolated cavities along grain boundaries aligned to the tensile axis.",
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High strain rate superplasticity of submicrometer grained 5083 Al alloy containing scandium fabricated by severe plastic deformation. / Park, Kyung Tae; Hwang, Duck Young; Lee, Young-Kook; Kim, Young Kuk; Shin, Dong Hyuk.

In: Materials Science and Engineering A, Vol. 341, No. 1-2, 20.01.2003, p. 273-281.

Research output: Contribution to journalArticle

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