Microstructural Change and Martensitic Transformation in a Rapidly Solidified Cu-Al-Ni Based SMA Ribbons with Heat Treatment

Kwang Koo Jee; Jin Seong Park; Y.S. Lee; Woo Yang Jang

doi:10.4028/www.scientific.net/SSP.118.59

Paper Titles

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Influence of Thermo-Mechanical Heat Treatment on the Thermoelectric Properties of Ag Added Bi₁Sb₃Te₆ Compounds
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X-Ray Diffraction Analysis on Crystallite Development of Nanostructured Aluminium
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Microstructural Change and Martensitic Transformation in a Rapidly Solidified Cu-Al-Ni Based SMA Ribbons with Heat Treatment
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Change of Microstructures of Directionally Solidified Ni Base Superalloy GTD-111 at High Temperature
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Effects of Modified Solution Heat Treatment on δ- Phase and Low Cycle Fatigue Properties of Inconel 718 Alloy
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Effect of Annealing Conditions on the Microstructure and Corrosion Characteristics of Zr-xNb Alloys
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HomeSolid State PhenomenaSolid State Phenomena Vol. 118Microstructural Change and Martensitic...

Microstructural Change and Martensitic Transformation in a Rapidly Solidified Cu-Al-Ni Based SMA Ribbons with Heat Treatment

Abstract:

The effects of flash-heating and aging on the microstructure and transformation characteristics has been studied in Cu-Al-Ni based melt-spun ribbons. When the as-spun ribbon, stabilized due to higher Al content and fast cooling, is flash-heated at 750 °C, the β1 parent phase is partially retained. Even though flash-heating temperature is increased upto 850 °C, a little β1 parent phase with lager grains above 10 μm is still retained. The Ms temperature is increased with increasing flash-heating temperature due to the decrease of grain constraint within grown grains. However, the greater part of β1 parent phase with smaller grains of 2 ~ 3 μm is transformed to martensite in the initial stage of aging at 200 °C. The Ms temperature of the ribbon with smaller grains is higher than that of the ribbon with larger grains. It is considered that the increase of Ms temperature is caused to the disappearance of lattice defects introduced during melt spinning by aging at 200 °C rather than grain growth.

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Solid State Phenomena (Volume 118)

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59-64

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.118.59

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Online since:

December 2006

Authors:

Kwang Koo Jee, Jin Seong Park, Y.S. Lee, Woo Yang Jang

Keywords:

Aging, Cu-Al-Ni sma Ribbon, Flash-Heating, Martensitic Transformation (MT), Microstructural Change, Stabilisation

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