A new insight into LPSO transformation during multi-axial forging in Mg-Gd-Y-Zn-Zr alloy

[Display omitted] •Recognition of LPSO transformation during high-temperature MAF as a deformation-assisted mechanism.•Development of a proper grain-orientation to nucleate and grow the lamellar LPSO through straining.•Formation of deformation-induced high-track diffusion as an expeditor of transfor...

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Bibliographic Details
Published in:Materials letters 2020-06, Vol.269, p.127625, Article 127625
Main Authors: Ramezani, S.M., Zarei-Hanzaki, A., Anoushe, A.S., Abedi, H.R., Minarik, P., Máthis, K., Horváth Fekete, K.
Format: Article
Language:English
Subjects:
Deformation-assisted transformation
Forging
Gadolinium
Grain orientation
Heating
Low temperature
LPSO structure
Magnesium
Magnesium base alloys
Materials science
Mechanical properties
Microstructure
Phase transformation
Phase transitions
Thermomechanical treatment
Zinc
Zirconium base alloys
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Summary:[Display omitted] •Recognition of LPSO transformation during high-temperature MAF as a deformation-assisted mechanism.•Development of a proper grain-orientation to nucleate and grow the lamellar LPSO through straining.•Formation of deformation-induced high-track diffusion as an expeditor of transformation. Long period stacking ordering (LPSO) significantly enhances the mechanical properties of magnesium alloys. Herein, for the first time, the effect of thermo-mechanical processing on the transformation of the LPSO during multi-axial forging at 400 °C has been addressed. Interestingly, a considerable growth of the lamellar LPSO from blocky phase and the transformation of blocky LPSO to Mg5Gd are recognized as a deformation-assisted evolutions. Covering the grains by the lamellar LPSO after 3 MAF passes is quite surprising, owing to short-time preheating/heating and relatively low temperature. It is justified through the development of (i) high-track diffusion and (ii) proper original grain orientation for propagation of LPSO lamellae, stemming from large imposed strain through MAF process.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2020.127625