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Characterisation of β Phase in WE54 Magnesium Alloy

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Abstract:

Precipitation hardened magnesium-rare earth alloys offer attractive properties for the aerospace and racing automotive industries. The most successful magnesium alloys developed to date have been those based on the Mg-Y-Nd system identified as WE54 (Mg-5.0wt%Y-4.1wt%RE-0.5wt%Zr) and WE43 (Mg-4.0wt%Y-3.3wt%RE-0.5wt%Zr), where RE represents neodymium-rich rare earth elements. Precipitations sequence in WE-system alloys involved the formation of phases designated β”, β’, β1 and β depending on the ageing temperature. WE54 alloy with the equilibrium β-phase exhibits good ductility and medium tensile strength. The β phase precipitated in Mg-Y-Nd alloy during ageing at 300 °C was studied using X-ray diffraction analysis and transmission electron microscopy. Precipitation at 300 °C for one hour causes formation of the equilibrium β phase. This phase has an f.c.c. structure (a = 2.2 nm), which makes it isomorphous with Mg5Gd. With the prolonged ageing time at 300 °C, the volume fraction of the β phase increases and lattice parameter of the solid solution of α-magnesium decreases.

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Periodical:

Solid State Phenomena (Volume 130)

Pages:

155-158

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.130.155

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Online since:

December 2007

Authors:

Tomasz Rzychoń, Andrzej Kiełbus, Bożena Bierska-Piech

Keywords:

Heat Treatment, Magnesium Alloy, Microstructure, Rietveld Method

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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References

[1] Avedesian M., Baker H., ASM specialty handbook, magnesium and magnesium alloys, ASM International, (1999).

Google Scholar

[2] Antion C. et al., Acta Materialia 51 (2003) pp.5335-5348.

Google Scholar

[3] Nie J.F., Muddle B.C., Acta Materialia, 48 (2000) pp.1691-1703.

Google Scholar

[4] Apps P.J., Karimzadeh H. et al. Scripta Materialia 48 (2003) p.1023.

Google Scholar

[5] Smola B. Stulikova I., et al., Materials Scince and Engineering A324 (2002) pp.113-117.

Google Scholar

[6] Young R.A. Skahivel A. et al. J. Appl. Cryst. 28 (1995) p.366.

Google Scholar

[7] The Rietveld method, in: R.W. Young (Ed. ), IUCr Monograph on Crystallography, vol. 5, Oxford Science Pub., (1993).

Google Scholar