Abstract
Phase transformations in the Co–9 at % Al have been investigated after slow furnace cooling. It has been shown that the structure and phase composition of the alloy after slow cooling do not correspond to the equilibrium phase diagram of the alloy of this chemical composition. It has been established that the α → ε martensitic transformation does not require overcooling and occurs even during a slow cooling of the alloy. It has been found that the formation of 4H modulated martensite is a specific feature of the binary alloys of cobalt and is not connected with the rate of their cooling. The Curie temperatures for the B2, α, and ε phases have been determined.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
A. N. Vasil’ev, V. D. Buchel’nikov, T. Takagi, V. V. Khovailo, and E. I. Estrin, “Shape memory ferromagnets,” Phys.-Usp. 46, 559–588 (2003).
T. Omori, Y. Sutou, K. Oikawa, R. Kainuma, and K. Ishida, “Shape memory effect associated with fcc–hcp martensitic transformation in Co–Al alloys,” Mater. Trans. 44, 2732–2735 (2003).
B. I. Nikolin and N. N. Shevchenko, “Formation of new multilayered martensite phases in Co–Al alloys— demonstration of polytypism in metallic alloys,” Fiz. Met. Metalloved. 51, 316–325 (1981).
O. P. Grishchenko and Yu. N. Koval’, “Study of the shape-memory effect in Co–5 wt % Al alloy,” Metallofiz. Nov. Tekhn. 22, 60–63 (2000).
A. J. McAllster, “The Al–Co (Aluminum–Cobalt) System,” Bull. Alloy Phase Diagrams 10, 646–649 (1989).
Phase Diagrams of Binary Metal Systems, Ed. by N. P. Lyakishev (Mashinostroenie, Moscow, 1996), Vol. 1. 7. Electronic Resource http://wwwcrctpolymtlca/fact/documentation/SGTE2011/Al–Cojpg, 2015.
E. Wachtel, V. Linse, and V. Gerold, “Defect structure and magnetic moments in the ß-phases of CoAl and CoGa,” J. Phys. Chem. Solids 34, 1461–1466 (1973).
K. Ishida, “Recent progress on Co-base alloys—Phase diagram and application,” Arch. Metall. Mater. 53, 1075–1088 (2008).
J. Dutkiewicz and G. Kostorz, “Structure of martensite in Co–W alloys,” Mater. Sci. Eng., A 132, 267–272 (1991).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © N.V. Kazantseva, N.N. Stepanova, N.I. Vinogradova, S.L. Demakov, A.S. Yurovskikh, D.I. Davydov, D.A. Shishkin, M.B. Rigmant, E.P. Romanov, 2016, published in Fizika Metallov i Metallovedenie, 2016, Vol. 117, No. 1, pp. 46–52.
Rights and permissions
About this article
Cite this article
Kazantseva, N.V., Stepanova, N.N., Vinogradova, N.I. et al. Study of the martensitic transformation in the Co–9 at % Al alloy. Phys. Metals Metallogr. 117, 42–48 (2016). https://doi.org/10.1134/S0031918X16010075
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0031918X16010075