TEM study on the microstructural evolution in an Mg-Y-Gd-Zn alloy during ageing

Li, Y. X., Qiu, D., Rong, Y. H. and Zhang, M. X. (2013) TEM study on the microstructural evolution in an Mg-Y-Gd-Zn alloy during ageing. Intermetallics, 40 45-49. doi:10.1016/j.intermet.2013.04.002


Author Li, Y. X.
Qiu, D.
Rong, Y. H.
Zhang, M. X.
Title TEM study on the microstructural evolution in an Mg-Y-Gd-Zn alloy during ageing
Formatted title
TEM study on the microstructural evolution in an Mg–Y–Gd–Zn alloy during ageing
Journal name Intermetallics   Check publisher's open access policy
ISSN 0966-9795
1879-0216
Publication date 2013-09
Sub-type Article (original research)
DOI 10.1016/j.intermet.2013.04.002
Volume 40
Start page 45
End page 49
Total pages 5
Place of publication United Kingdom
Publisher Elsevier
Collection year 2014
Language eng
Formatted abstract
Highlights
• We examine the microstructural evolution in an Mg–Y–Gd–Zn alloy during ageing.
• We propose new precipitation sequences in the WGZ1251K alloy at 225 °C.
• The effect of LPSO phase as well as stacking faults on age hardening is negligible.
β' phase is responsible for age hardening in this system.

The multi-phase microstructural evolution in an Mg–Y–Gd–Zn alloy during ageing at 225 °C was studied in TEM and the age-hardening mechanism is elucidated in this paper. Two independent precipitation reactions were observed in this alloy, i.e. α-Mg(SSS) + β(Mg24(Y,Gd,Zn)5) → α + β + 18R and α-Mg(SSS) → βสบ(D019) → β′(cbco) → β1(fcc) → β. The age-hardening contribution from precipitates is discussed based on their size, shape, orientation and distribution at corresponding ageing stages. The major hardening precipitate is found to be β' phase with a c-axis base-centered orthogonal (cbco) structure, rather than the long period stacking ordered (LPSO) phase that prevailed in some earlier studies.
Keyword Rare-earth intermetallics
Long-period superlattices
Age-hardening
Electron microscopy, transmission
Solidified Mg97Zn1Y2 alloy
Period ordered structure
Mechanical-properties
Magnesium alloy
Long
Strength
Precipitate
Phase
Orientation
Chemistry
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2014 Collection
 
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