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Purpose: The main aim of presented work was to find a sintering conditions (temperature and time) for manufacturing of a Ni(1-X)Ti50CuX alloy (where X = 2; 3; 5; 10; 15; 20 and 25at%.) by powder technology. Design/methodology/approach: Various conditions of sintering considering temperature and time were applied to compacted powders. Sintering temperature varied from 850°C to 1100°C and sintering time was chosen from a range of 5 to 50 hours, respectively. Microstructure, structure, chemical composition and thermal behavior of sintered blends were studied by scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and X-ray diffraction. Findings: Homogenous alloys, containing lower addition of copper (less than 10 at%), were sintered at 940°C for 7 hours. For higher copper content (10-25at%) lower sintering temperature 8500C but longer sintering time was preferred (20 hours). The quality of the alloy was characterized by porosity and density. In sintered blends non-transformable phases Ti2(Ni,Cu) and (Ni,Cu)3Ti, which posses the crystal structure of Ti2Ni and Cu3Ti respectively, were found. Despite the fact that same sintering conditions lead to an increase of inhomogeneity all sintered alloys reveal the presence of the reversible martensitic transformation. Practical implications: Obtained results allowed to optimize sintering condition for NiTiCu shape memory alloy manufacturing. Originality/value: A NiTiCu shape memory alloy, with various content of copper, was successfully produced by powder metallurgy.
Wydawca
Rocznik
Tom
Strony
65--68
Opis fizyczny
Bibliogr. 5 poz., tab., wykr.
Twórcy
autor
- Institute of Materials Science, University of Silesia, ul. Bankowa 12, 40-007 Katowice, Poland
autor
- Department of Metallurgy and Materials Engineering, Katholieke Universiteit Leuven, Kasteelpark Arenberg 44, B-3001 Leuven, Belgium
Bibliografia
- [1] T.H. Nam, T. Saburi, Y. Nakata and K. Shimizu, Shape memory characteristic and lattice deformation In Ti-Ni-Cu alloys, Materials Transactions JIM 31 (1990) 1050-1056.
- [2] F. Fukuda, T. Kakeshita, M. Kitayama and K. Saburi, Effect of ageing on martensitic transformation in a shape memory Ti40.5Ni10Cu alloy, Journal de Physique IV 5(1995) C8-717.
- [3] R. Santamarta, E. Cesari, J. Pons and T. Goryczka, Shape memory properties of Ni-Ti based melt-spun ribbons, Metallurgical and Materials Transactions 35A (2004) 761-770.
- [4] T. Goryczka, P. Ochin, Characterization of a Ni50Ti50 shape memory strip produced by twin roll casting technique, Journal of Materials Processing Technology 162–163 (2005) 178–183.
- [5] F. Dalle, G. Despert, Ph. Vermaut, R. Portier, A. Dezellus, P. Plaindoux, P. Ochin, Ni49,8Ti42,2Hf8 shape memory alloy strips production by the twin roll casting technique, Materials Science and Engineering A 346 (2003) 320-327.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-0d214a90-d6a4-4862-8740-92c5dfa1af8b