Phase transformation of rapidly solidified TiNi shape memory alloy

Wang, S.D.; Wu, Xian; Zhang, J.P.; Su, Hang-Biao; Jin, J.L.; Song, Binwen

doi:10.1016/b978-1-4832-8381-4.50248-1

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…On the other hand, melt spinning introduces microstructural differences in comparison with the conventional cast material; the best known example is the reduction of the grain size (in some cases, the as-spun ribbons may be almost fully amorphous) promoting a decrease in the transformation temperatures and a possible improvement of mechanical and functional properties (i.e., superelasticity and damping capacity). [11,12] However, not many references about the mechanical behavior or the shape-memory effect (SME) shown by melt-spun ribbons can be found. The present work will study more deeply the shape memory behaviour of equiatomic NiTi, and Ni-Ti-Cu (with Cu content of 5 and 25 at.…”

Section: Introductionmentioning

confidence: 99%

Shape memory properties of Ni-Ti based melt-spun ribbons

Santamarta¹,

Cesari²,

Pons³

et al. 2004

Metall Mater Trans A

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Shape-memory properties of equiatomic NiTi, Ni 45 Ti 50 Cu 5 , and Ni 25 Ti 50 Cu 25 ribbons made by melt spinning have been studied by temperature inducing the martensitic transformation under constant tensile loads. Recoverable strains above 4 pct can be obtained under ϳ100 MPa loads for the NiTi and Ni 45 Ti 50 Cu 5 ribbons, transforming to B19Ј martensite. The B19 martensite is formed in the Ni 25 Ti 50 Cu 25 ribbon after crystallization, and according to the lowering in transformation strain as Cu content increases, the recoverable strain is close to 2.5 pct for ϳ150 MPa load. The transformation temperatures exhibit a linear dependence on the applied stress, which can be quantitatively described by means of a Clausius-Clapeyron type equation. The NiTi and Ni 45 Ti 50 Cu 5 ribbons exhibited some degree of two-way shape-memory effect (TWSME) after thermomechanical cycling. Texture analyses performed on the different ribbons allow us to better understand the transformation strains obtained in each ribbon. The amounts of shapememory effect (SME) and nonrecoverable strain shown by the studied ribbons are of the same order as those already observed in bulk materials, which makes melt spinning an ideal substitute to complicated manufacturing processes if really thin samples are needed. However, applicable stresses in melt-spun ribbons are limited by a relatively "premature" brittle fracture caused by irregularities in ribbon thickness.

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Section: Introductionmentioning

confidence: 99%

Shape memory properties of Ni-Ti based melt-spun ribbons

Santamarta¹,

Cesari²,

Pons³

et al. 2004

Metall Mater Trans A

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“…The production of almost ready-to-use ribbons by this way reduces the grain size, therefore decreases the transformation temperatures, compared to the bulk material, and the mechanical properties can be improved [9,10]. The 25 at % copper containing alloy, which is usually amorphous in as-spun state, has been recently studied by several authors in order to check the crystallisation process and its influence on the microstructure and martensitic transformation [11][12].…”

Section: Introductionmentioning

confidence: 99%

Thermo-mechanical behaviour of a Ni-Ti-Cu melt spun alloy

2001

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Abstract. The martensitic transformation of a melt spun Ti 5 oNi25Cu25 alloy (cubic B2 s orthorhombic B19) has been investigated by means of thermo-mechanical cycling. The alloy was initially amorphous and it has been characterised after a controlled crystallisation process using differential scanning calorimetry, X-ray diffraction, thermal cycling tests under constant load, tensile tests and transmission electron microscopy. The recoverable elongation and the transformation temperatures have been studied as a function of the applied stress. However a new phenomena not yet completely understood has been observed during the cycling experiments under constant load. For the direct transformation, although the net shape change is an elongation, the strain-temperature e(T) curve has a region with a local contraction (opposite to the external load). The equivalent effect is also observed in the reverse transformation curve. The "training ability" (to achieve the two way shape memory effect) shown by the melt spun studied ribbons is lower than in other Ni-Ti ribbons.

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Criteria of Transformation Sequences in NiTi Shape Memory Alloys

Liu

Mccormick

1996

Mater. Trans., JIM

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Phase transformation of rapidly solidified TiNi shape memory alloy

Cited by 3 publications

References 2 publications

Shape memory properties of Ni-Ti based melt-spun ribbons

Shape memory properties of Ni-Ti based melt-spun ribbons

Thermo-mechanical behaviour of a Ni-Ti-Cu melt spun alloy

Criteria of Transformation Sequences in NiTi Shape Memory Alloys

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