Microstructure and martensitic transformation of TiNiNbB shape memory alloys |
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| Affiliation: | 1. University of Belgrade, “Vin?a” Institute of Nuclear Sciences, 11000 Belgrade, Serbia;2. University of Belgrade, Faculty of Technology and Metallurgy, 11000 Belgrade, Serbia;3. University of Ni?, Faculty of Sciences and Mathematics, 18000 Ni?, Serbia;4. High Chemical Technological School, 37000 Kru?evac, Serbia |
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| Abstract: | In present work, microstructure, martensitic transformation and mechanical properties of Ti44Ni47?xNb9Bx (x = 0, 0.5, 1, 5 at.%) alloys were investigated as a function of B content. The results show that the addition of B significantly influences the microstructure of the alloys. The microstructure of Ti44Ni47Nb9 alloy consists of B2 parent phase matrix and β-Nb phase. When the B content is 0.5 at.%, Nb3B2 phase presents. With further increasing B content to above 1 at.%, TiB and NbB phases present instead of Nb3B2 phase. With increasing B content, the transformation temperatures increase due to the reduced Ni/Ti ratio and Nb content in the matrix. The mechanical properties can be optimized by the addition of 1 at.% B. |
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| Keywords: | A Shape–memory alloys B Martensitic transformation B Mechanical properties B Shape–memory effects D Microstructure |
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