Premartensitic attenuation in Ti–30Ni–20Cu shape memory alloy

Ren, Xiaobing; Otsuka, Kazuhiro; Suzuki, Takao

doi:10.1016/s0925-8388(03)00286-x

Cited by 10 publications

(7 citation statements)

References 9 publications

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“…Obviously the above processes are enhanced with lowering temperature due to the lowering of energy barrier between undistorted state and distorted state. This explains why attenuation and elastic peak increase with approaching M s [190].…”

Section: Premartensitic Attenuation and Heterophase Fluctuationmentioning

confidence: 88%

“…In Ti-Ni-Fe alloys, the diffuse scattering was found to correspond to tiny ''domains'' [183][184][185], rather than the tweed structure as observed in Ni-Al alloys [186,187]. Furthermore, ultrasonic attenuation experiment on Ti-Nibased alloys confirmed the existence of premartensitic attenuation [188][189][190].…”

Section: Basic Microscopic Picture Of Precursor Phenomenamentioning

confidence: 97%

“…Premartensitic attenuation in the parent phase has not received much attention until very recently [188][189][190]219], mostly because such effect is not expected and hard to explain when considering the parent phase is a homogeneous phase that lacks an apparent mechanism for damping or attenuation. However, if considering there is heterophase fluctuation in the parent phase, it is natural to expect that such fluctuation should interact with alternating stress and cause energy dissipation, as explained in Section 5.2.…”

Section: Premartensitic Attenuation and Heterophase Fluctuationmentioning

confidence: 99%

“…Fig. 43(a) shows the premartensitic mechanical attenuation prior to B2-B19 transformation in a single crystal of Ti-30Ni-20Cu [190]. Temperature dependence of the elastic peak or central peak of the elastic phonon scattering (an indicator of static strain modulation) and the 1/2 TA 2 phonon energy of the same sample are also shown.…”

Section: Premartensitic Attenuation and Heterophase Fluctuationmentioning

confidence: 99%

See 3 more Smart Citations

Physical metallurgy of Ti–Ni-based shape memory alloys

Otsuka

Ren

2005

Progress in Materials Science

3,918

2,030

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Section: Premartensitic Attenuation and Heterophase Fluctuationmentioning

confidence: 88%

Section: Basic Microscopic Picture Of Precursor Phenomenamentioning

confidence: 97%

Section: Premartensitic Attenuation and Heterophase Fluctuationmentioning

confidence: 99%

Section: Premartensitic Attenuation and Heterophase Fluctuationmentioning

confidence: 99%

See 2 more Smart Citations

Physical metallurgy of Ti–Ni-based shape memory alloys

Otsuka

Ren

2005

Progress in Materials Science

3,918

2,030

View full text Add to dashboard Cite

“…These anomalies are called precursor phenomena of the MT, and have been shown by the central peak in elastic neutron phonon spectrum measurements, 3,4 diffuse scattering ͑corresponding to tiny domains͒ and extra diffuse peaks in x-ray diffraction, 5,6 and premartensitic attenuation in ultrasonic attenuation experiments. 7 The precursor phenomena play an important role in the MT, for example, stabilizing the martensite phase and lowering the energy barrier of the MT. It was believed that the precursor phenomena can be partly ascribed to the chemical disorder in the alloys.…”

Section: Introductionmentioning

confidence: 99%

Point defects and their interaction in TiNi from first-principles calculations

Lü

Wang

et al. 2007

Phys. Rev. B

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A first-principles plane-wave pseudopotential method based on density functional theory is used to investigate the concentrations of point defects and their interaction in TiNi. The calculations show that, in the thermal equilibrium state, TiNi develops antisite-type point defect configurations. In accordance with the sequence of the stability of the B2, B19, and B19Ј phases, the concentrations of the point defects in stoichiometric TiNi at the identical temperature decrease from B2 to B19 to B19Ј. At high temperature, there are considerable amounts of vacancies in Ti-rich compounds. The calculated interaction energies show that the nearestneighboring Ni antisite and Ti antisite are attractive to each other, whereas the second-nearest-neighboring Ni antisites repel each other and Ti antisites mutually attract, which indicates that a Ti-rich domain may appear in stoichiometric TiNi, and also explains the high solubility of excess Ni and low solubility of excess Ti in TiNi. The electronic structure mechanisms behind the interactions between the point defects are discussed based on charge density calculations. It was shown that the attractive interaction between Ti antisites is due to the accumulation of electron density between the Ti antisites, whereas the repulsion between Ni antisites is due to the depletion of electron density between them.

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Multi-step and anomalous reproducible behaviour of the electrical resistivity near the first-order magnetostructural transition of Gd₅(Si_0.1Ge_0.9)₄

Sousa

Pereira

Correia

et al. 2005

J. Phys.: Condens. Matter

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Very detailed measurements of the electrical resistivity of Gd 5 (Si 0.1 Ge 0.9 ) 4 are here reported, with special emphasis on the vicinity of the first-order (magnetostructural) martensitic transition which occurs at T S ∼ 87 K. The data cover more than fifty thermal cycles spanning the temperature ranges of 300-10 K (long cycles) and 105-10 K (short cycles). In the initial 10-300 K cycles the martensitic transition takes place in three closely-spaced steps, with associated resistance (R) discontinuities and large thermal hysteresis. In a subsequent series of short cycles (10-105 K) a unique transition occurs, exhibiting a common and quite reproducible R(T ) behaviour within a small temperature range ( T ∼ 4 K) below T S , either in heating or cooling runs. Remarkably, this 'local reproducibility' (within T ) remains in spite of the significant resistance changes which occur outside the T -range under thermal cycling. In particular the residual resistance systematically increases under thermal cycling, but the corresponding effect is absent in the T temperature range. This excludes microcracking as a dominant resistive mechanism in our results, pointing to an intrinsic character of the reproducible behaviour just below T S . We also analyse the R(T ) behaviour when changing from long to short thermal cycles, and the R(T ) evolution towards a reversible final behaviour, after extended thermal cycling.

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Premartensitic attenuation in Ti–30Ni–20Cu shape memory alloy

Cited by 10 publications

References 9 publications

Physical metallurgy of Ti–Ni-based shape memory alloys

Physical metallurgy of Ti–Ni-based shape memory alloys

Point defects and their interaction in TiNi from first-principles calculations

Multi-step and anomalous reproducible behaviour of the electrical resistivity near the first-order magnetostructural transition of Gd₅(Si_0.1Ge_0.9)₄

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Premartensitic attenuation in Ti–30Ni–20Cu shape memory alloy

Cited by 10 publications

References 9 publications

Physical metallurgy of Ti–Ni-based shape memory alloys

Physical metallurgy of Ti–Ni-based shape memory alloys

Point defects and their interaction in TiNi from first-principles calculations

Multi-step and anomalous reproducible behaviour of the electrical resistivity near the first-order magnetostructural transition of Gd5(Si0.1Ge0.9)4

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Product

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Multi-step and anomalous reproducible behaviour of the electrical resistivity near the first-order magnetostructural transition of Gd₅(Si_0.1Ge_0.9)₄