A comparative study of elastic constants of Ti–Ni-based alloys prior to martensitic transformation

Ren, Xiaobing; Miura, Norihiko; Zhang, J; Otsuka, Kazuhiro; Tanaka, Katsushi; Koiwa, M.; Suzuki, Takao; Chumlyakov, Yu. I.; Asai, M.

doi:10.1016/s0921-5093(00)01876-1

Cited by 257 publications

(129 citation statements)

References 26 publications

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“…Now we modify this schematic free energy landscape by assuming the system has instability with respect to two different martensites, R-phase and B19'. This assumption has gained support from known experimental observations in Ti-Ni and Ti-Ni-Fe systems, where not only B19', but also R, has been observed to appear depending on different composition, temperature, and themomechanical conditions 25,26 . A typical example is the phase diagram of Ti-Ni-Fe 19 , where both R and B19' exist, suggesting that these two phases are competing low temperature phases of the system, and the system has instability with respect to both phases.…”

Section: Methodsmentioning

confidence: 63%

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Stress-induced strain glass to martensite (R) transition in a Ti50Ni44.5
Zhang
¹
,
Wang
²
,
Ding
³

et al. 2011
Phys. Rev. B
28
1
19
0
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Strain glass (STG) in Ni-rich binary Ti-Ni possesses an R-like (rhombohedral) local strain order, but it transforms into B19' martensite under stress. It remains a puzzle why the local strain order in STG yields a different long-range strain order.Here, we systematically investigated a ternary Ti 50 Ni 44.5 Fe 5.5 STG, which exhibited the same STG features as the binary STG, and the local strain order is also an R-like one.Being different from the binary STG, under stress this ternary STG transforms into a normal R-phase rather than B19'. By considering that both systems have bi-instability with respect to both R and B19' martensites in the schematic free energy landscape, we provide a unified explanation for the different products of the stress-induced STG to martensite (STG-M) transition between Ti-Ni binary system and the present ternary system. We show that the difference stems from the competing thermodynamic stability between R-phase and B19' martensites.2

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Section: Methodsmentioning

confidence: 63%

“…As shown in Fig. 6, Fe doping to Ti-Ni destabilizes both R and B19', but has much stronger effect to destabilize B19' martensite 25 ; this can also be inferred from the Ti-Ni-Fe phase diagram 19 .…”

mentioning

confidence: 66%

Stress-induced strain glass to martensite (R) transition in a Ti50Ni44.5
Zhang
¹
,
Wang
²
,
Ding
³

et al. 2011
Phys. Rev. B
28
1
19
0
View full text Add to dashboard Cite

show abstract

“…It is reported, for example, that the NiTi alloys have different soft-phonon mode according to the martensitic transformation paths. Elastic constants of c 0 ð¼ ðc 11 -c 12 Þ=2Þ and c 44 of all the NiTi and NiTiCu alloys soften with lowering temperature but Cu-addition increases c 44 which controls the transformation of B19 0 [19]. Phonon dispersion curves of TA2 phonon branch for NiTi and NiTiCu alloys indicate that the former has two dips near the position of q ¼ 1=3 and 1/2 and the latter has only one dip near q ¼ 1=2 [20,21].…”

Section: Resultsmentioning

confidence: 99%

Pre-martensitic phenomena of thermoelastic martensitic transformation of NiTiCu alloys studied with positron annihilation lifetime spectroscopy

Katsuyama¹,

Araki²,

Mizuno³

et al. 2004

Science and Technology of Advanced Materials

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Many anomalous phenomena have been observed in NiTi alloys above martensite start temperature, such as softening of the shear constants, increase of internal friction and diffuse scattering of TEM. However, little information has been obtained about the change in the electron system of the parent phase prior to the martensitic transformation, which should be the origin of all pre-martensitic phenomena. In this work, the temperature change of positron annihilation lifetime, which is quite sensitive to electronic-structural changes of matter, were carried out for NiTiCu alloys. The alloys show martensitic transformation from a B2 (cubic) phase to a B19 0 (monoclinic) phase via a B19 (orthorhombic) phase as the temperature is lowered. We have found anomalous positron lifetime changes in Ni 10 Ti 50 Cu 40 and Ni 15 Ti 50 Cu 35 alloys which show a B2-B19-B19 0 phase transformation. Positron lifetime increases anomalously with decreasing temperature at temperatures higher than the transformation temperature into a B19 0 phase. On the other hand, positron lifetime does not show any anomaly in the B2 phase of Ni 30 Ti 50 Cu 20 alloy which shows B2-B19 phase transformation. The positron lifetime of the parent B2 phase shows good agreement with the theoretically-calculated value. Those of the martensite phases of B19 and B19 0 , although, are about 30 ps longer than calculated ones. This big difference between experimental and calculated positron lifetimes cannot be explained by any existing theory.

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“…NiTi is a SMA which can be found in three different phases, the cubic austenite, the rhombohedric R-phase and the monoclinic martensite phase [24]. The transition from austenite to R-phase however can also be seen as a martensitic transformation as it manifests itself in changes of electric resistivity [31] or neutron diffraction measurements [29].…”

Section: Illustration On a Specimen Of Nitimentioning

confidence: 99%

“…Because of that, they have been in the scope of experimental as well as analytical and computational research for decades cf. [1,[3][4][5]9,21,22,24,30].…”

Section: Introduction Gibbs Free Energy Dissipation Energetic Solumentioning

confidence: 99%

Modeling of shape-memory alloys on the mesoscopic level

Benešová

2009

ESOMAT 2009 - 8th European Symposium on Martensitic Transformations

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Abstract. This contribution presents some recent results on modeling of phase transformation in the pseudo-elastic regime within the framework of continuum mechanics. We recall an efficient concept for quasi-static evolution of microstructure in the isothermal rate-independent case. We then concentrate on simulation results obtained by the presented model, performed on a single-crystal prismatic NiTi-specimen. Algorithmic details, i.e. energy-estimates-based optimization, are also given.

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A comparative study of elastic constants of Ti–Ni-based alloys prior to martensitic transformation

Cited by 257 publications

References 26 publications

Stress-induced strain glass to martensite (R) transition in a Ti50Ni44.5
Zhang
¹
,
Wang
²
,
Ding
³

et al. 2011
Phys. Rev. B
28
1
19
0
View full text Add to dashboard Cite

Stress-induced strain glass to martensite (R) transition in a Ti50Ni44.5
Zhang
¹
,
Wang
²
,
Ding
³

et al. 2011
Phys. Rev. B
28
1
19
0
View full text Add to dashboard Cite

Pre-martensitic phenomena of thermoelastic martensitic transformation of NiTiCu alloys studied with positron annihilation lifetime spectroscopy

Modeling of shape-memory alloys on the mesoscopic level

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A comparative study of elastic constants of Ti–Ni-based alloys prior to martensitic transformation

Cited by 257 publications

References 26 publications

Stress-induced strain glass to martensite (R) transition in a Ti50Ni44.5Zhang1, Wang2, Ding3 et al. 2011Phys. Rev. B281190View full textAdd to dashboardCite

Stress-induced strain glass to martensite (R) transition in a Ti50Ni44.5Zhang1, Wang2, Ding3 et al. 2011Phys. Rev. B281190View full textAdd to dashboardCite

Pre-martensitic phenomena of thermoelastic martensitic transformation of NiTiCu alloys studied with positron annihilation lifetime spectroscopy

Modeling of shape-memory alloys on the mesoscopic level

Contact Info

Product

Resources

About

Stress-induced strain glass to martensite (R) transition in a Ti50Ni44.5
Zhang
¹
,
Wang
²
,
Ding
³

et al. 2011
Phys. Rev. B
28
1
19
0
View full text Add to dashboard Cite

Stress-induced strain glass to martensite (R) transition in a Ti50Ni44.5
Zhang
¹
,
Wang
²
,
Ding
³

et al. 2011
Phys. Rev. B
28
1
19
0
View full text Add to dashboard Cite