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Nam, Tae-Hyun; Noh, Jungpil; Jung, Dae-Won; Kim, Yeon-Wook; Im, Hee-Joong; Ahn, Jeung Sun; Mitani, Tadaoki

doi:10.1023/a:1014222007203

Cited by 17 publications

(3 citation statements)

References 4 publications

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“…Besides for Ti-Ni-Cu sputtered thin film, Ti-Ni-Cu ribbons fabricated by melt spinning technique can be as candidate materials for sensors or actuators in micro-miniature systems [3]. The unique microstructure, transformation characteristics and mechanical properties of Ti-Ni-Cu ribbons can be introduced by the technique compared with that in a bulk Ti-Ni-Cu alloy [4]. The above-mentioned properties are affected not only by annealing condition but also by the composition of the alloys [5].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Tensile Behavior of Ti-Rich Ti-Ni-Cu Melt-Spun Ribbon

Wen

Min

Толочко

2014

AMR

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Microstructure and mechanical properties of Ti51.5Ni25Cu23.5 ribbon fabricated by melt spinning were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM) and tensile tests. Some B19 martensite crystalline with (011) compound twin was embedded in the mainly amorphous ribbon, while the ribbon annealed at 450°C for 1 h is at fully martensitic state. Annealing process alter the preferential orientation from (022)-B19 to (111)-B19. Tensile fracture stresses of as-spun ribbon and the annealed ribbon are 1257 MPa and 250 MPa, respectively. The tensile fracture morphology of as-spun ribbon shows typical vein fringe while that of the annealed ribbon reveals fine but depth-inhomogeneous dimples. After tensile deformation, the annealed ribbon exhibits typical martensitic detwinning behavior accompanying with the strain contrast.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Tensile Behavior of Ti-Rich Ti-Ni-Cu Melt-Spun Ribbon

Wen

Min

Толочко

2014

AMR

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“…The addition of a third element such as Fe, Al, Mo, Cr, and Co to an equiatomic Ti-Ni alloy induces B2-R transformation [6][7][8][9]. Rapid solidification induces the B2-R phase transformation by forming matrix-coherent Ti 2 Ni particles and introducing high-density dislocations [10].…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability of the R Phase of a Rapidly Solidified Ti-47.3Ni (at%) Alloy

Moon¹,

Chun²,

Nam

et al. 2012

Transactions on Electrical and Electronic Materials

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Transformation behavior of rapidly solidified Ti-47.3Ni (at%) alloy ribbons and thermal stability of the R phase in the ribbons were investigated by means of differential scanning calorimetry (DSC), X-ray diffraction, and transmission electron microscopy. Rapidly solidified Ti-47.3Ni alloy ribbons showed the two-stage B2-R-B19' martensitic transformation behavior. The B2-R transformation in the ribbons was observed even after annealing at 1,223 K, which was attributed to the fact that a specific orientation relationship between Ti 2 Ni and matrix in the ribbons is maintained after annealing at 1,223 K. The DSC peak temperature of the B2-R transformation (T R *) decreased with raising annealing temperature, which was attributed to the increased volume fraction of Ti 2 Ni, thus causing an increased Ni content in the matrix.

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“…This effect is enhanced for the smaller diameter SMA wires that are of the order of some of the smallest commercially available thermocouples [34]. Using resistivity to predict temperature in a SMA is also difficult since it is non-monotonic with temperature and changes with cyclic history [35][36][37]. Direct surface temperature measurement using infrared cameras is often used for convective studies [38], though this method is difficult for very thin SMA wires due to resolution limitations.…”

Section: Introductionmentioning

confidence: 99%

Transformation strain based method for characterization of convective heat transfer from shape memory alloy wires

Pathak

Brei

Luntz³

2010

Smart Mater. Struct.

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While shape memory alloys (SMAs) have many actuation benefits, their frequencies are commonly restricted by slow cooling times caused by limitations in convective heat transfer. To increase the cooling speed and at the same time reduce excess power consumption from overheating, it is critical to understand the heat transfer from SMA wires. This requires accurate surface temperature measurement under a fixed input power, which is difficult to obtain using traditional methods because of the nature of SMAs (thin wires, large strains, heat activation, ambient environment, etc). This paper introduces a non-invasive technique for calculating the convective coefficient for SMAs by employing the temperature-induced transformation strain of SMAs to estimate the surface temperature. This method was experimentally validated for measurement of the convective coefficient in air where infrared cameras can operate, and then used to indirectly measure the convective coefficient across a range of commonly utilized SMA wire diameters and ambient media where traditional methods are limited. Formulated empirical correlations to the collected data provide a mathematical relationship to calculate the convective coefficient in material models which serve as better estimates of convection, and may be used for optimization of SMA actuators for increased frequency performance while ensuring that power draw is minimized.

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Cited by 17 publications

References 4 publications

Microstructure and Tensile Behavior of Ti-Rich Ti-Ni-Cu Melt-Spun Ribbon

Microstructure and Tensile Behavior of Ti-Rich Ti-Ni-Cu Melt-Spun Ribbon

Thermal Stability of the R Phase of a Rapidly Solidified Ti-47.3Ni (at%) Alloy

Transformation strain based method for characterization of convective heat transfer from shape memory alloy wires

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