Microstructure Similarities between Phases F and U in Al-Pd-Co Alloys

Abstract:

The work is aimed at searching for compositionally variant isostructural mutations of the cubic F-phase in both as-annealed (850°C/500 h) and DTA-cooled conditions of the Al₇₂Pd₉Co₁₉ alloy. Recently, the mutations were reported for the U-phase in the Al_69.8Pd_13.8Co_16.4 alloy annealed at 700°C for 2000 h. In the investigation, scanning electron microscopy including energy dispersive X-ray spectroscopy, powder X-ray diffraction, and differential thermal analysis (DTA) were used. Two isostructural mutations of the F-phase, F_L (the product of L-parent) and F_V (the product of V-parent), were identified (symbol L stands for liquid). On DTA-cooling, the bivariant heterogeneous transition (L_part→V), the monovariant heterogeneous transformation (L_rest→V+F_L), and the monovariant quasi-eutectoid transformation (V_rest→Al₅Co₂+F_V) were recorded.

• Periodical: Solid State Phenomena (Volume 258)
• Pages: 440-443
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.258.440
• Online since: December 2016
• Authors: Ivona Černičková, Marek Adamech, Libor Ďuriška, Marian Drienovsky, Dusan Janičkovič, Pavol Priputen, Jozef Janovec
• Keywords: Al-Pd-Co Alloys, Differential Thermal Analysis, F-Phase, Isostructural Phases

References

[1] J.M. Dubois: J. Phys. Condens. Mat. Vol. 13 (2001), p.7753.

[2] S. Balanetskyy, B. Grushko, T.Y. Velikanova and K. Urban: J. Alloy. Compd. Vol. 376 (2004), p.158.

[3] V.N. Balbyshev, D.J. King, A.N. Khramov, L.S. Kasten and M.S. Donley: Thin Solid Films Vol. 447–448 (2004), p.558.

DOI: 10.1016/j.tsf.2003.07.026

[4] M. Yurechko, B. Grushko, T. Velikanova and K. Urban: J. Alloys Comp. Vol. 337 (2002), p.172.

[5] K. Sugiyama, K. Yubuta, Y. Yokoyama, S. Suzukland and R. Simura: Acta Phys. Pol. A Vol. 126 (2014), p.588.

[6] I. Černičková, R. Čička, P. Švec, D. Janičkovič, P. Priputen and J. Janovec, in: A Study of Phase Equilibria in the Al–Pd–Co System at 700°C, edited by S. Schmid, Aperiodic Crystals, Springer (2013).

DOI: 10.1007/978-94-007-6431-6_18

[7] S. Mi, M. Yurechko, J. Wu and B. Grushko: J. Alloys Comp. Vol. 329 (2001), p. L1.

[8] I. Černičková, P. Priputen, T.Y. Liu, A. Zemanová, E. Illeková, D. Janičkovič, P. Švec, M. Kusý, Ľ. Čaplovič and J. Janovec: Intermetallics Vol. 19 (2011), p.1586.

DOI: 10.1016/j.intermet.2011.06.003

[9] I. Černičková, P. Švec, E. Illeková, D. Janičkovič, P. Priputen and J. Janovec: Key Eng. Mat. Vol. 592–593 (2014), p.517.