Superplastisches Umformpotenzial der Magnesiumlegierung MgAl9Zn1 durch Doppelwalzenguss

Vit Janik, G. Bali, R. Grimes, R. Dashwood

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In this study, the twin roll casting process has been utilized to prepare initial as-cast strip of AZ91 alloy that has been further tested in uniaxial tension at 325, 350 and 375 oC, and at strain rates from 10-2 to 10-4 s-1. The ability of AZ91 strip to undergo superplastic or superplastic-like deformation in longitudinal direction, in transverse direction, and in 45 degrees to longitudinal direction was investigated with no further thermal or thermomechanical processing applied prior to the testing. At temperature 350 oC and medium strain rate the maximum elongation reached almost 200% in direction parallel to the strip casting, however in the transverse and 45 degrees direction, different temperature, and at higher strain rates the maximum elongation was lower. Based on microstructural investigation by means of optical microscopy and scanning electron microscopy (SEM) it could be seen that continuous dynamic recrystallization of initial coarse dendritic as-cast microstructure during elevated temperature deformation is active and responsible for high elongations. Additional analysis is provided by means of a strain rate sensitivity characterization and its evolution with increased level of strain. Strain rate sensitivity of AZ91alloy increased with increasing level of strain from 0.20 to 0.33. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Translated title of the contributionSuperplastisches Umformpotenzial der Magnesiumlegierung MgAl9Zn1 durch Doppelwalzenguss
Original languageMultiple
Pages (from-to)815-821
Number of pages7
JournalMaterialwissenschaft und Werkstofftechnik
Volume45
Issue number9
DOIs
Publication statusPublished - 29 Aug 2014
Externally publishedYes

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strain rate
Strain rate
elongation
Elongation
strip
casts
Casting
Dynamic recrystallization
Temperature
Optical microscopy
temperature
Direction compound
microscopy
Scanning
microstructure
Microstructure
Scanning electron microscopy
scanning electron microscopy
Testing
Processing

Keywords

  • Anisotropie
  • Anisotropy
  • Dehnratenempfindlichkeit
  • Doppelwalzenguss
  • Hot forming
  • Key words: Magnesium
  • Kleinserienfertigung
  • Low-volume automotive manufacturing
  • Magnesium
  • Strain rate sensitivity
  • Twin-roll casting
  • Warmumformung

ASJC Scopus subject areas

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

Cite this

Superplastic forming ability of as-cast AZ91 Mg alloy prepared by twin roll casting. / Janik, Vit; Bali, G.; Grimes, R.; Dashwood, R.

In: Materialwissenschaft und Werkstofftechnik, Vol. 45, No. 9, 29.08.2014, p. 815-821.

Research output: Contribution to journalArticle

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abstract = "In this study, the twin roll casting process has been utilized to prepare initial as-cast strip of AZ91 alloy that has been further tested in uniaxial tension at 325, 350 and 375 oC, and at strain rates from 10-2 to 10-4 s-1. The ability of AZ91 strip to undergo superplastic or superplastic-like deformation in longitudinal direction, in transverse direction, and in 45 degrees to longitudinal direction was investigated with no further thermal or thermomechanical processing applied prior to the testing. At temperature 350 oC and medium strain rate the maximum elongation reached almost 200{\%} in direction parallel to the strip casting, however in the transverse and 45 degrees direction, different temperature, and at higher strain rates the maximum elongation was lower. Based on microstructural investigation by means of optical microscopy and scanning electron microscopy (SEM) it could be seen that continuous dynamic recrystallization of initial coarse dendritic as-cast microstructure during elevated temperature deformation is active and responsible for high elongations. Additional analysis is provided by means of a strain rate sensitivity characterization and its evolution with increased level of strain. Strain rate sensitivity of AZ91alloy increased with increasing level of strain from 0.20 to 0.33. {\circledC} 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.",
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