Precipitation Processes in Mg-Y-Nd Alloys

Abstract:

Successive precipitation processes in solution treated Mg3Y3Nd alloy were studied by electrical resistometry, by differential scanning calorimetry and by microhardness. The results were compared to those in the commercial WE43 alloy. Five various phases known from the Mg-Gd-and Mg-Nd-type decomposition sequences form, dissolute or transform in the Mg3Y3Nd alloy. The main difference in the WE43 precipitation sequence is the absence of the β₁ phase particles. Electron microscopy confirmed that not the phase type of hardening particles but their morphology, size and orientation to the matrix determine the hardening effectiveness. Differential scanning calorimetry revealed exothermic effects connected to precipitation processes. Apparent activation energies of individual precipitation processes correspond to those in the MgTbNd and in MgNd alloys.

• Periodical: Defect and Diffusion Forum (Volumes 334-335)
• Pages: 155-160
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.334-335.155
• Online since: February 2013
• Authors: Martin Vlach, Bohumil Smola, Hana Císařová, Ivana Stulíková
• Keywords: Calorimetry, Electrical Resistivity, MgYNd Alloys, Microhardness, Microstructure, Phase Transformation

References

[1] Elektron WE43 Datasheet 467: Magnesium Elektron UK, www. magnesium-elektron. com, 2. 5. (2012).

[2] Elektron WE54 Datasheet 466: Magnesium Elektron UK, www. magnesium-elektron. com, 2. 5. (2012).

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

[4] B.L. Mordike: Mater. Sci. Eng. A 324 (2002), p.103.

[5] T. Rzychoń, J. Michalska, A. Kiełbus: J. Achiev. Mater. Manufact. Eng. 21 (2007) 51-54.

[6] F. Zucchi, V. Grassi, A. Frignani, C. Monticelli, G. Trabanelli: J. Appl. Electroch. 36 (2006), p.195.

[7] X.N. Gu, W. R . Zhou, Y.F. Zheng, Y. Cheng, S.C. Wei, S.P. Zhong, T. F . Xi, L.J. Chen: Acta Biomater. 6 (2010), p.4605.

[8] B. Smola, L. Joska, V. Březina, I. Stulíková, F. Hnilica: Mater. Sci. Eng. C 32 (2012), p.659.

[9] G.W. Lorimer, in: Proceedings Magnesium Technology, Institute of Metals, London (1986), p.47.

[10] J. F. Nie, B. C. Muddle: Acta Mater. 48 (2000), p.1691.

[11] B. Smola, I. Stulíková, F. von Buch, B. L. Mordike: Mater. Sci. Eng. A 324 (2002), p.113.

[12] B. L. Mordike, I. Stulíková, B. Smola: Metall. Mater. Trans. A 36 (2005), p.1729.

[13] P. J. Apps, H. Karimzadeh, J. F. King, G.W. Lorimer,: Scripta Mater. 48 (2003), p.475.

[14] Q. Peng, J. Wang, Y. Wu, L. Wang: Mater. Sci. Eng. A 433 (2006), p.133.

[15] D. Li, J. Dong, X. Zeng, C. Lu, W. Ding,: J. Alloys Compd. 439 (2007), p.254.

[16] P. J . Apps, H. Karimzadeh, J. F. King, G.W. Lorimer,: Scripta Mater. 48 (2003), p.1023.

[17] V. Neubert, I. Stulíková, B. Smola, B.L. Mordike, M. Vlach, A. Bakkar, J. Pelcová: Mater. Sci. Eng. A 462 (2007), p.329.

DOI: 10.1016/j.msea.2005.11.077

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

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

[19] B. Smola, I. Stulíková,: Kovove Mater. 42 (2004), p.301.

[20] T. B. Massalski: Binary Alloys Phase Diagrams. 2nd ed. Materials Park, OH, American Soc. for Materials (1990).

[21] B. Smola, I. Stulíková, J. Černá, J. Čížek, M. Vlach: Phys. Stat. Sol. A 208 (2011), p.2741.

DOI: 10.1002/pssa.201127296

[22] M.J. Starink: Thermochim. Acta 404 (2003), p.163.

[23] G. Riontino, D. Lussana, M. Massazza: J. Thermal Anal. Calorim. 83 (2006), p.643.

[24] T.J. Pike, B. Noble: J. Less Common Met. 30 (1973), p.63.