Microstructure and superplastic properties in an ECAE AI-4MgO. SSc alloy processed at elevated temperatures

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)109-114
Journal / PublicationMaterials Science Forum
Volume304-306
Publication statusPublished - 1999
Externally publishedYes

Abstract

Equal-channel-angular-cxtrusion(ECAE) was conducted to an Al-4Mg-0. 5Sc alloy at two elevated temperatures of 473 and 673 K. The effect of processing temperature during heavily straining was investigated. Microstructural examinations revealed the formation of fine-graincd(∼ 0. 5 ;<m) structure at a low operating temperature of 473K, whereas a coarse-grain(∼ 25 ;<m) was formed at 673 K. The material processed at 473 K exhibited the lower flow stress with higher ductility and high strain rate sensitivity of 0. 5 indicating the dominant deformation mechanism was grain boundary sliding. Finer grain structure exhibited the high-strain-rate superplasticity can be obtained at the lower processing temperature. The results indicate that the operating temperature has highly influenced the ECAE process. © 1999 Trans Tech Publications,.

Research Area(s)

  • Equal-Channel-Angular-Extrusion, Grain Structure, M-Value, Subgrain structure, Thermomechanical Process, Uniform Deformation

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