Restoration mechanisms at moderate temperatures for As-Cast ZK40 magnesium alloys modified with individual Ca and Gd additions

Research output: Journal contributionsJournal articlesResearchpeer-review

Authors

  • Ricardo Henrique Buzolin
  • Leandro Henrique Moreno Guimaraes
  • Julián Arnaldo Ávila Díaz
  • Erenilton Pereira da Silva
  • Domonkos Tolnai
  • Chamini L. Mendis
  • Norbert Hort
  • Haroldo Cavalcanti Pinto

The deformation behaviour of as-cast ZK40 alloys modified with individual additions of Ca and Gd is investigated at 250C and 300C. Compression tests were carried out at 0.0001 s−1 and 0.001 s−1 using a modified Gleeble system during in-situ synchrotron radiation diffraction experiments. The deformation mechanisms are corroborated by post-mortem investigations using scanning electron microscopy combined with electron backscattered diffraction measurements. The restoration mechanisms in α-Mg are listed as follows: the formation of misorientation spread within α-Mg, the formation of low angle grain boundaries via dynamic recovery, twinning, as well as dynamic recrystallisation. The Gd and Ca additions increase the flow stress of the ZK40, which is more evident at 0.001 s−1 and 300C. Dynamic recovery is the predominant restoration mechanism in all alloys. Continuous dynamic recrystallisation only occurs in the ZK40 at 250C, competing with discontinuous dynamic recrystallisation. Discontinuous dynamic recrystallisation occurs for the ZK40 and ZK40-Gd. The Ca addition hinders discontinuous dynamic recrystallisation for the investigated temperatures and up to the local achieved strain. Gd addition forms a semi-continuous network of intermetallic compounds along the grain boundaries that withstand the load until their fragmentation, retarding discontinuous dynamic recrystallisation.

Original languageEnglish
Article number1140
JournalCrystals
Volume10
Issue number12
Pages (from-to)1-22
Number of pages22
ISSN2073-4352
DOIs
Publication statusPublished - 16.12.2020
Externally publishedYes

Bibliographical note

The authors would like to thank the Brazilian Synchrotron Light Laboratory (LNLS) CNPEM/MCTIC for the use of the XTMS beamline. RHB acknowledges the CD-Laboratory for Design of High-Performance Alloys by Thermomechanical Processing with the support of the Christian Doppler Forschungsgesellschaft. L.H.M.G. acknowledges the financial Support of Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES) (Process No. 88882.180165/2018-01). J.A.Á.D. acknowledges CNPq for a postdoc scholarship (Grant No. 150215/2016-9). The authors sincerely acknowledge Maria Cecilia Poletti for fruitful and meaningful discussions. Open Access Funding by the Graz University of Technology.

    Research areas

  • Characterisation, Deformation behaviour, Electron microscopy, In-situ diffraction, Magnesium alloys, Restoration mechanisms
  • Engineering

DOI

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