Abstract
Using powder metallurgy methods, we have produced Fe—Ni—Co—Ti alloys that have a thermoelastic martensive transformation, which is the basis of the shape-memory effect manifested by such materials. Since pores are believed to improve the shape memory, specifically the reversible nature of the strain, attention was focused on development of the technology and investigation of the characteristics of porous Fe—Ni—Co—Ti alloys. The problems that arise during sintering of such alloys from sputtered powders are due to the chemical inhomogeneity of the initial structure and of the structure formed when the liquid phase appears. Various forms of activation, such as cyclic sintering and a stepped increase in temperature, were used to prevent the liquid phase from appearing. The properties of Fe—Ni—Co—Ti alloys with a shape memory effect can be improved if the porosity is increased by obtaining larger powder grains with a more complicated shape.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
V. V. Kokorin, The Martensite Transformation in Inhomogeneous Solid Solutions [in Russian], Nauk. Dumka (1987).
V. V. Kokorin, Yu. N. Samsonov, V. A. Chernenko, and O. M. Shevchenko, “Superelasticity in Fe−Ni−Co−Ti alloys,” Fiz. Met. Metalloved.,67, No. 5, 1035–1037 (1989).
V. V. Kokorin, L. P. Gunko, and O. M. Shevchenko, “Martensite γ⇔α transformation in ausaged Fe−Co based alloy,” Scr. Met.,28, No. 1, 35–40 (1993).
O. M. Shevchenko and G. V. Gavrilyuk, “Change in the structure of Fe−Ni−Co−Ti alloys during production and heat treatment,” in: Electron Microscopy and Strength of Materials [in Russian], Inst. Probl. Materialoved., Akad. Nauk Ukrainy, Kiev (1993), pp. 159–167.
Additional information
Materials Science Institute, Ukrainian Academy of Sciences Kiev. Translated from Poroshkovaya Metallurgiya, Nos. 1–2, pp. 79–85, January–February. 1997.
Rights and permissions
About this article
Cite this article
Shevchenko, O.M., Gavrilyuk, G.V., Kokorin, V.V. et al. Obtaining Fe—Ni—Co—Ti alloys having a thermoelastic martensite transformation. Powder Metall Met Ceram 36, 71–76 (1997). https://doi.org/10.1007/BF02684256
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02684256