Neutron diffraction phase analysis during thermal cycling of a Ni-rich NiTi shape memory alloy using the Rietveld method

Neutron diffraction phase analysis during thermal cycling of a Ni-rich NiTi shape memory alloy using the Rietveld method

Martensitic transformations in an aged Ni-rich NiTi shape memory alloy are analysed using neutron diffraction and electron microscopy. The material shows a two step transformation on cooling from B2. After the first release of latent heat on cooling two martensitic phases (R-phase and B19 ′) are pre...

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Veröffentlicht in:Scripta materialia 2002-04, Vol.46 (7), p.543-548
Hauptverfasser: Sitepu, H, Schmahl, W.W, Allafi, J.K, Eggeler, G, Dlouhy, A, Toebbens, D.M, Tovar, M
Format: Artikel
Sprache:eng
Schlagworte:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Electron diffraction
Exact sciences and technology
Martensitic transformations
Materials science
Metals. Metallurgy
Neutron diffraction
Ni 4Ti 3 precipitates
Ni-rich NiTi shape memory alloys
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Rietveld method
Transmission electron microscopy
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Zusammenfassung:Martensitic transformations in an aged Ni-rich NiTi shape memory alloy are analysed using neutron diffraction and electron microscopy. The material shows a two step transformation on cooling from B2. After the first release of latent heat on cooling two martensitic phases (R-phase and B19 ′) are present. This is due to a heterogeneous microstructure after solution annealing and ageing.
ISSN:1359-6462
1872-8456
DOI:10.1016/S1359-6462(02)00032-5