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標題: Aging effect on a Ti47.25Ni48.75V4 shape memory alloy
作者: Lin, H.C.
Yang, C.H.
Lin, M.C.
Lin, C.S.
Lin, K.M.
Chang, L.S.
關鍵字: TiNiV shape memory alloy;martensitic transformation;aging treatment;ti-ni alloys;aged ti49ni51 alloy;martensitic-transformation;at-percent;r-phase;deformation;behavior;heat;pseudoelasticity
Project: Journal of Alloys and Compounds
期刊/報告no:: Journal of Alloys and Compounds, Volume 449, Issue 1-2, Page(s) 119-124.
Aging effect on a Ti47.25Ni48.75V4 shape memory alloy is investigated. Experimental results reveal that the 400 degrees C aged Ti47.25Ni48.75V4 alloy exhibits a B2 -> R -> B19' two-stage martensitic transformation on cooling, but exhibits a B19'-> B2 one-stage transformation on heating. Two kinds of second phases, (Ti,V)(2)Ni and V-9(Ti,Ni), are observed in the solution-treated Ti47.25Ni48.75V4 alloy. (Ti,V)(2)Ni exhibits an FCC order structure with a lattice parameter of 11.1 angstrom while V-9 (Ti,Ni) exhibits a BCC structure with a lattice parameter of 3.01 angstrom. There appear lots of fine spherical V-9(Ti,Ni) and coherent Ti3Ni4 precipitates after 400 degrees C aging for the Ti47.25Ni48.75V4 alloy. These precipitates will strengthen the alloy's matrix and improve the shape recovery ability. (c) 2006 Elsevier B.V. All rights reserved.
ISSN: 0925-8388
DOI: 10.1016/j.jallcom.2006.01.136
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