Influence of heat treatment and microstructure on the tensile pseudoelastic response of an Ni-rich NiTi shape memory alloy
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Leandru-Gheorghe Bujoreanu
Abstract
The influence of microstructure on the stress–strain behavior of an Ni-rich NiTi shape memory alloy is examined. Specimens cut from a large-diameter bar of Ni50.7Ti49.3 shape memory alloy were analyzed in two states: (i) annealed and (ii) annealed and aged. The annealed state shows a fully austenitic structure with no precipitates and no distortions caused by residual stresses. The annealed and aged state has coherent Ni4Ti3 particles precipitated in the proximity of the austenite grain boundaries. The size of the precipitates increases moving away from the grain boundaries toward the grain interiors. The evolution of the two states in the stress–strain–temperature space has been analyzed using tensile specimens with special geometry. Due to the complex effects of the coherent precipitates, the specimens in the aged state exhibited lower stress plateaus in the tensile loading–unloading curves, which enabled the occurrence of transformation pseudoelasticity from room temperature to 333 K.
References
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© 2010, Carl Hanser Verlag, München
Articles in the same Issue
- Contents
- Contents
- Editorial
- Prof. Dr. Monika Feller-Kniepmeier 80th birthday
- Basic
- Model calculation of inoculation and experimental verification in two alloy-systems
- Enrichment of boron at grain boundaries of platinum-based alloys determined by electron energy loss spectroscopy in a transmission electron microscope
- Measurement of the lattice misfit of Pt–Al–Cr superalloy by convergent beam electron diffraction (CBED)
- Microstructural and micromechanical characterisation of a Pt–Al–Cr–Ni–Re alloy by means of transmission electron microscopy and nanoindentation
- X-ray reflections from the γ/γ′-microstructure of nickel-base superalloys: effect of the plane tilting
- Physicochemical properties and creep strength of a single crystal of nickel-base superalloy containing rhenium and ruthenium
- Interdependence between glass stability and phase formation sequence during crystallization of Zr46.8Ti8.2Cu7.5Ni10Be27.5 bulk glass
- On the formation of λ-MnAl4
- Applied
- Development of Ni–Mn-based alloys for the fast epitaxial braze-repair of single-crystalline nickel-based superalloys
- Influence of heat treatment and microstructure on the tensile pseudoelastic response of an Ni-rich NiTi shape memory alloy
- Microstructural stability of an Ni–Mo based Hastelloy after 10 MeV electron irradiation at high temperature
- Oxidation behaviour of TiAl-based intermetallic coatings on γ-TiAl alloys
- Oxidation and fatigue behaviour of γ-TiAl coated with HIPIMS CrAlYN/CrN nanoscale multilayer coatings and EB-PVD thermal barrier coatings
- On the stress corrosion cracking behaviour of 6XXX series aluminium alloys
- Investigation of surface film nanostructure and assessment of its impact on friction force stabilization during automotive braking
- Creep strength of a binary Al62Ti38 alloy
- Bowing out of a dislocation from wall of persistent slip bands (PSB)
- Effect of martensite volume fraction on mechanical properties of dual-phase treated AISI-4012 sheet steels
- The joint properties of dissimilar aluminum plates joined by friction stir welding
- Notification
- DGM News
Articles in the same Issue
- Contents
- Contents
- Editorial
- Prof. Dr. Monika Feller-Kniepmeier 80th birthday
- Basic
- Model calculation of inoculation and experimental verification in two alloy-systems
- Enrichment of boron at grain boundaries of platinum-based alloys determined by electron energy loss spectroscopy in a transmission electron microscope
- Measurement of the lattice misfit of Pt–Al–Cr superalloy by convergent beam electron diffraction (CBED)
- Microstructural and micromechanical characterisation of a Pt–Al–Cr–Ni–Re alloy by means of transmission electron microscopy and nanoindentation
- X-ray reflections from the γ/γ′-microstructure of nickel-base superalloys: effect of the plane tilting
- Physicochemical properties and creep strength of a single crystal of nickel-base superalloy containing rhenium and ruthenium
- Interdependence between glass stability and phase formation sequence during crystallization of Zr46.8Ti8.2Cu7.5Ni10Be27.5 bulk glass
- On the formation of λ-MnAl4
- Applied
- Development of Ni–Mn-based alloys for the fast epitaxial braze-repair of single-crystalline nickel-based superalloys
- Influence of heat treatment and microstructure on the tensile pseudoelastic response of an Ni-rich NiTi shape memory alloy
- Microstructural stability of an Ni–Mo based Hastelloy after 10 MeV electron irradiation at high temperature
- Oxidation behaviour of TiAl-based intermetallic coatings on γ-TiAl alloys
- Oxidation and fatigue behaviour of γ-TiAl coated with HIPIMS CrAlYN/CrN nanoscale multilayer coatings and EB-PVD thermal barrier coatings
- On the stress corrosion cracking behaviour of 6XXX series aluminium alloys
- Investigation of surface film nanostructure and assessment of its impact on friction force stabilization during automotive braking
- Creep strength of a binary Al62Ti38 alloy
- Bowing out of a dislocation from wall of persistent slip bands (PSB)
- Effect of martensite volume fraction on mechanical properties of dual-phase treated AISI-4012 sheet steels
- The joint properties of dissimilar aluminum plates joined by friction stir welding
- Notification
- DGM News
