Paper Titles

Self- and Solute Diffusion, Interdiffusion and Thermal Vacancies in the System Iron-Aluminium
p.1

Effect of Austenitising Temperature on Microstructural Changes in High-Speed Steel of M2 Type Inoculated with Addition of WC Powder
p.27

Li Diffusion in (110) Oriented LiNbO₃ Single Crystals
p.33

Anisotropy of Hydrogen Diffusivity in ZnO
p.39

Diffusion Processes in Early Stages of Precipitation in Mg-Gd and Mg-Tb Alloys
p.51

Design and Development of Nb-W-Mo Alloy Membrane for Hydrogen Separation and Purification
p.61

Calculating of Diffusion Profiles in Ternary Systems Using Effective Interdiffusion Coefficients of Components
p.73

Bi-Velocity Phase Field Method
p.83

The Influence of Yttrium on Kinetics and Mechanism of Chromia Scale Growth on Fe-Cr-Ni Base Steels
p.91

HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 333Diffusion Processes in Early Stages of...

Diffusion Processes in Early Stages of Precipitation in Mg-Gd and Mg-Tb Alloys

Article Preview

Abstract:

Early stages of precipitation were investigated in solution treated binary Mg-Tb and Mg-Gd alloys. The supersaturated solid solution of Gd (or Tb) in Mg was formed by fast quenching of the alloys from solution treatment temperature. Decomposition of the supersaturated solid solution and precipitation effects were investigated by positron lifetime spectroscopy combined with microhardness testing. During solution treatment at elevated temperature some thermal vacancies form pairs with solute atoms. In quenched samples free vacancies are quickly annealed out, while more stable vacancies bound to solute atoms remain in the sample and enhance the diffusivity of solutes. The hardness of solution treated Mg-Tb and Mg-Gd alloys aged at ambient temperature rises due to formation of small clusters of Tb and Gd atoms. Isochronal annealing of Mg-Tb and Mg-Gd alloys leads to precipitation of coherent β phase, semicoherent β phase and incoherent β phase particles. It was found that natural aging of Mg-Tb alloy at ambient temperature has beneficial effect on subsequent hardening by β phase particles formed during annealing.

You might also be interested in these eBooks

Recent Advances in Mass Transport in Engineering Materials

Info:

Periodical:

Defect and Diffusion Forum (Volume 333)

Pages:

51-60

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.333.51

Citation:

Cite this paper

Online since:

January 2013

Authors:

Oksana Melikhova, Jakub Čížek, Petr Hruška, Martin Vlach, Bohumil Smola, Ivana Stulíková, Ivan Procházka

Keywords:

Mg Alloy, Natural Aging, Positron Annihilation, Precipitation

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2013 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

[1] L.L. Rokhlin: Magnesium Alloys Containing Rare Earth Metals, Taylor and Francis, London (2003).

[2] G.W. Lorimer: Proc. of the London Conference Mg Technology, London (1986), p.47.

[3] B.L. Mordike: Mat. Sci. Eng. A Vol. 324 (2002), p.103.

[4] P. Vostrý, I. Stulíková, B. Smola, M. Cieslar and B.L. Mordike: Z. Metallkde Vol. 79 (1988), p.340.

[5] B.L. Mordike and T. Ebert: Mater. Sci. Eng. A Vol. 302 (2001), p.37.

[6] I. A. Anyanwu, Y Kitaguchi, I. Harima, S. Kamado, Y. Kojima, S. Tanike and I. Seki, in: Magnesium 97, edited by E. Agion, D. Eliezer, Magnesium research institute (MRI) Ltd., Beer-Sheva, (1997), p.127.

[7] J. Čížek, O. Melikhova, I. Procházka, J. Kuriplach, I. Stulíková, P. Vostrý and J. Faltus: Phys. Rev. B Vol. 71 (2005), 064106.

DOI: 10.1103/physrevb.71.064106

[8] P. Hautojärvi and C. Corbel, in: Proc. International School of Physics Enrico Fermi, Course CXXV, edited by A. Dupasquier, A.P. Mills, IOS Press, Varena (1995), p.491.

[9] P. Asoka-Kumar, M. Alatalo, V.J. Ghosh, A.C. Kruseman, B. Nielsen, K.G. Lynn: Phys. Rev. Lett. Vol. 77 (1996), p. (2097).

DOI: 10.1103/physrevlett.77.2097

[10] J. Čížek, I. Procházka, B. Smola, I. Stulíková, M. Vlach, V. Očenášek, O.B. Kulyasova and R.K. Islamgaliev: Int. J. Mat. Res. Vol. 100 (2009), p.780.

DOI: 10.3139/146.110103

[11] R. Ferragut, F. Moia, F. Fiori, D. Lussana and G. Riontino: J. Alloys Compd. Vol. 495 (2010), p.408.

[12] B. Smola, I. Stulíková, J. Černá, J. Čížek and M. Vlach: Phys. Status Solidi A Vol. 208, (2011), p.2741.

DOI: 10.1002/pssa.201127296

[13] O. Melikhova, J. Čížek, P. Hruška, M. Vlček, I. Procházka, M. Vlach, I. Stulíková, B. Smola, N. Žaludová, R.K. Islamgaliev: Defect and Diffusion Forum Vol. 322 (2012), p.151.

DOI: 10.4028/www.scientific.net/ddf.322.151

[14] J. Čížek, M. Vlček, B. Smola, I. Stulíková, I. Procházka, R. Kužel, A. Jäger, P. Lejček: Scripta Mater. Vol. 66, (2012), p.630.

DOI: 10.1016/j.scriptamat.2012.01.054

[15] F. Bečvář, J. Čížek, I. Procházka and J. Janotová: J. Nucl. Instrum. Methods A Vol. 539 (2005), p.372.

[16] J. Čížek. M. Vlček, I. Procházka: Nucl. Instrum. Methods A 623, 982 (2010).

[17] J. M. Campillo Robles, E. Ogando and F. Plazaola: J. Phys.: Condens Matter Vol. 19 (2007), 176222.

[18] C. Wolverton: Acta Mater. 55, 5867 (2007).

[19] M. Ohta, F. Hashimoto: J. Phys. Soc. Jpn. 19, 1987 (1964).

[20] P. Tzanetakis, J. Hillairet and G. Revel: Phys. Stat. Sol. (b) Vol. 75 (1976), p.433.

[21] G.M. Hood: Phys. Rev. B Vol. 26 (1982), p.1036.

[22] J. Čížek, B. Smola, I. Stulíková, P. Hruška, M. Vlach, M. Vlček, O. Melikhova and I. Procházka: Phys. Stat. Sol. A (2012) in print doi: 10. 1002/pssa. 201228327.

DOI: 10.4028/www.scientific.net/ddf.322.151

[23] P. Vostrý, B. Smola, I. Stulíková, F. von Buch and B.L. Mordike: Phys. Stat. Sol. (a) Vol. 175 (1999), p.491.

DOI: 10.1002/(sici)1521-396x(199910)175:2<491::aid-pssa491>3.0.co;2-f