In situ synchrotron radiation diffraction investigation of the compression behaviour at 350 °C of ZK40 alloys with addition of CaO and Y

R. H. Buzolin, C. L. Mendis, D. Tolnai, Andreas Stark, N. Schell, H. Pinto, K. U. Kainer, N. Hort

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The evolution of the microstructure during compression is investigated with in situ synchrotron radiation diffraction in as-cast ZK40, ZK40-2CaO and ZK40-1Y Mg alloys. The specimens were compressed at 350 °C with a strain rate of 10-3 s-1 until 30% deformation. The Y containing alloy showed the highest 0.2% proof strength in compression of 35 MPa at 350 °C which is double that of the ZK40 alloy, while the CaO added alloy shows a moderate increment at 23 MPa. The Y containing alloy shows some work hardening, while the CaO modified and the ZK40 alloys do not show work hardening after yield. Synchrotron radiation diffraction timelines show that continuous and discontinuous dynamic recrystallization occurs during deformation of the ZK40 alloy while a small amount of dynamic recrystallization was observed in the ZK40-1Y alloy. However, dynamic recrystallization was not present in the ZK40-2CaO alloy. SEM-EBSD analysis conducted on the deformed samples shows a significantly high volume fraction of twins in the Y and CaO containing alloys which was absent in the ZK40 alloy. The modified deformation behaviours observed in the CaO and Y containing alloys were attributed to the presence of intermetallic particles found at the grain boundaries and to the role of Ca and Y in stabilising twinning.

Original languageEnglish
Pages (from-to)2-9
Number of pages8
JournalMaterials Science and Engineering A
Volume664
DOIs
Publication statusPublished - 10 May 2016
Externally publishedYes

Fingerprint

Synchrotron radiation
synchrotron radiation
Compaction
Diffraction
Dynamic recrystallization
diffraction
Strain hardening
work hardening
Twinning
ZK40 alloy
Intermetallics
Strain rate
Volume fraction
Grain boundaries
Microstructure
Scanning electron microscopy
twinning
strain rate
intermetallics
casts

Keywords

  • Calcium oxide
  • Elevated temperature deformation
  • In situ synchrotron radiation diffraction
  • Magnesium alloy
  • Yttrium
  • ZK40

ASJC Scopus subject areas

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

Cite this

In situ synchrotron radiation diffraction investigation of the compression behaviour at 350 °C of ZK40 alloys with addition of CaO and Y. / Buzolin, R. H.; Mendis, C. L.; Tolnai, D.; Stark, Andreas; Schell, N.; Pinto, H.; Kainer, K. U.; Hort, N.

In: Materials Science and Engineering A, Vol. 664, 10.05.2016, p. 2-9.

Research output: Contribution to journalArticleResearchpeer-review

Buzolin, R. H. ; Mendis, C. L. ; Tolnai, D. ; Stark, Andreas ; Schell, N. ; Pinto, H. ; Kainer, K. U. ; Hort, N. / In situ synchrotron radiation diffraction investigation of the compression behaviour at 350 °C of ZK40 alloys with addition of CaO and Y. In: Materials Science and Engineering A. 2016 ; Vol. 664. pp. 2-9.
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AU - Stark, Andreas

AU - Schell, N.

AU - Pinto, H.

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AB - The evolution of the microstructure during compression is investigated with in situ synchrotron radiation diffraction in as-cast ZK40, ZK40-2CaO and ZK40-1Y Mg alloys. The specimens were compressed at 350 °C with a strain rate of 10-3 s-1 until 30% deformation. The Y containing alloy showed the highest 0.2% proof strength in compression of 35 MPa at 350 °C which is double that of the ZK40 alloy, while the CaO added alloy shows a moderate increment at 23 MPa. The Y containing alloy shows some work hardening, while the CaO modified and the ZK40 alloys do not show work hardening after yield. Synchrotron radiation diffraction timelines show that continuous and discontinuous dynamic recrystallization occurs during deformation of the ZK40 alloy while a small amount of dynamic recrystallization was observed in the ZK40-1Y alloy. However, dynamic recrystallization was not present in the ZK40-2CaO alloy. SEM-EBSD analysis conducted on the deformed samples shows a significantly high volume fraction of twins in the Y and CaO containing alloys which was absent in the ZK40 alloy. The modified deformation behaviours observed in the CaO and Y containing alloys were attributed to the presence of intermetallic particles found at the grain boundaries and to the role of Ca and Y in stabilising twinning.

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