The structure of TiNi martensite

Michal, G. M.; Sinclair, Robert

doi:10.1107/s0567740881007292

Cited by 198 publications

(67 citation statements)

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“…Figure 8 shows X-ray diffraction (XRD) patterns of martensitic NiTi samples (a) before compression, (b) after dynamic compression, (c) after quasi-static compression, (d) after dynamic compression and annealing at 873 K (600°C) for 30 minutes, and (e) after quasistatic compression and annealing at 873 K (600°C) for 30 minutes. The sample before compression shows diffraction peaks from monoclinic martensitic NiTi (PDF#: 00-035-1281 [58] ) and cubic austenitic NiTi (PDF#: 00-019-0850 [59] ). While Ti 2 Ni particles are observed in the SEM images, the Ti 2 Ni phase (PDF#: 00-018-0898 [60] ) is not detectable using XRD likely due to the fact that only a small percentage of the particles are present, and therefore, the intensity of the diffraction is weak.…”

Section: Discussionmentioning

confidence: 99%

Influence of Dynamic Compression on Phase Transformation of Martensitic NiTi Shape Memory Alloys

Qiu

Young

Nie

2015

Metall Mater Trans A

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Shape memory alloys (SMAs) exhibit high damping capacity in both austenitic and martensitic phases, due to either a stress-induced martensite phase transformation or a stress-induced martensite variant reorientation, making them ideal candidates for vibration suppression devices to protect structural components from damage due to external forces. In this study, both quasi-static and dynamic compression was conducted on a martensitic NiTi SMA using a mechanical loading frame and on a Kolsky compression bar, respectively, to examine the relationship between microstructure and phase transformation characteristics of martensitic NiTi SMAs. Both endothermic and exothermic peaks disappear completely after experiencing deformation at a strain rate of 10 3 s À1 and to a strain of about 10 pct. The phase transformation peaks reappear after the deformed specimens were annealed at 873 K (600°C) for 30 minutes. As compared to samples from quasi-static loading, where a large amount of twinning is observed with a small amount of grain distortion and fracture, samples from dynamic loading show much less twinning with a larger amount of grain distortion and fracture.

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Section: Discussionmentioning

confidence: 99%

Influence of Dynamic Compression on Phase Transformation of Martensitic NiTi Shape Memory Alloys

Qiu

Young

Nie

2015

Metall Mater Trans A

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“…Such an assumption, however, does not appear straightforward for TiNi-Cu, as an asymmetric configuration of the (010) BI9 . layers has already been discovered in the B19' structure of binary TiNi [16,17]. Additionally, a small shift of atoms from the central-symmetric positions has been observed in the (010) ORT layers of the orthorhombic AuCd [9], which was previously considered as having the B19 type [18].…”

Section: Refinement Of Martensite Structure In Ni 25 Ti 50 Cu 2smentioning

confidence: 99%

“…It is unlikely that this shift is related with the ternary composition of Ti 50 Ni 25 Cu 2 5 alloy, as Cu and Ni atoms seem to be randomly mixed in the Ni-sublattice. Note that the B19'structure in binary TiNi also exhibits atomic shifts from the centro-symmetric positions [16,17] despite of its simple equiatomic composition, thus the atomic configuration of martensitic structures in TiNi and TiNi-Cu could be related with each other [20].…”

Section: Refinement Of Martensite Structure In Ni 25 Ti 50 Cu 2smentioning

confidence: 99%

Structural characterisation of melt-spun Ti₅₀Ni₂₅Cu₂₅ ribbons

et al. 2001

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Abstract. The structure of melt-spun Ti5 0 Ni 25 Cu 2 5 ribbons after various heat treatments has been studied by X-ray and TEM analyses. As-received amorphous Ti 50 Ni 2 5Cu 2 5 ribbons, when annealed at 500"C for a few minutes, crystallise into the B2 structure, which fully transforms into the orthorhombic martensite upon cooling. The X-ray scans of Ti5"Ni 25 Cu25 ribbons annealed for 5 min. at 500"C show the well developed orthorhombic pattern, which was used for refinement of the orthorhombic martensitic structure of TiNi-Cu alloys. The refined structure of the orthorhombic martensite in TiNi-Cu alloys differs from the standard B19 type suggested previously. X-ray investigation reveals a shift of atoms in the (010) ORT layers from the centro-symmetric positions towards the [001] ORT direction. The longer annealing of Ti 50 Ni 25 Cu 25 ribbons at 500"C causes TiCu precipitation and results in appearance of untransformed B2 grains at room temperature. Annealing at 700"C causes Ti,Cu 4 precipitation with significant Cu depletion of the matrix resulting in the appearance of the mixed orthorhombic and monoclinic martensite.

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“…ES of the monoclinic B19'-phase obtained by LMTO-ASA [7,9,10] and LAPW [8] method are at variance near the Fermi energy. It should be pointed out that the difference in the crystallographic data for B19'-phase [1][2][3][4] occurs. The relationship between the instabilities of the B2-phases in the Ti-based alloys and the features of their electronic structure were discussed in the papers [6,[8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…The phase transitions in the alloys are proceeded by anomalies in various physical properties, which are summarized under the name of premartensitic phenomena. The TiNi crystal structure and properties have been studied in numerous experimental and theoretical works [1][2][3][4][5][6][7][8][9][10]. Several attempts have been made to explain MT in TiNi by specific features of the electronic structure (ES) of its parent B2-phase.…”

Section: Introductionmentioning

confidence: 99%

The investigation of electronic properties of Ti-based alloys

Kulkova

Valujsky

2001

J. Phys. IV France

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Abstract. The self-consistent band structure calculations of the ordered and disordered intermetallic titaniumbased alloys were performed using full-potential linearized augmented plane wave (FLAPW) method and Korringa-Khon-Rostoker -coherent potential approximation (KKR-CPA) The electronic structure of the (001) surfaces are also calculated. The alteration of the electronic properties in the three TiMe series (Me=Fe, Co. Ni. Ru, Rli, Pd, Os, Ir, Pt) are discussed in the dependence of a number of valence electrons. The changes of the electronic structure during martensitic transformation, with disordering and alloying are analyzed. The calculated emission, absorption, electron energy loss spectra and optical properties are found to be in good agreement with experiment.

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The structure of TiNi martensite

Cited by 198 publications

References 1 publication

Influence of Dynamic Compression on Phase Transformation of Martensitic NiTi Shape Memory Alloys

Influence of Dynamic Compression on Phase Transformation of Martensitic NiTi Shape Memory Alloys

Structural characterisation of melt-spun Ti₅₀Ni₂₅Cu₂₅ ribbons

The investigation of electronic properties of Ti-based alloys

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The structure of TiNi martensite

Cited by 198 publications

References 1 publication

Influence of Dynamic Compression on Phase Transformation of Martensitic NiTi Shape Memory Alloys

Influence of Dynamic Compression on Phase Transformation of Martensitic NiTi Shape Memory Alloys

Structural characterisation of melt-spun Ti50Ni25Cu25 ribbons

The investigation of electronic properties of Ti-based alloys

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Structural characterisation of melt-spun Ti₅₀Ni₂₅Cu₂₅ ribbons