Effects of nanoprecipitation on the shape memory and material properties of an Ni-rich NiTiHf high temperature shape memory alloy

H. E. Karaca; S. M. Saghaian; G. Ded; H. Tobe; B. Basaran; H. J. Maier; R. D. Noebe; Y. I. Chumlyakov

doi:10.1016/j.actamat.2013.08.048

Effects of nanoprecipitation on the shape memory and material properties of an Ni-rich NiTiHf high temperature shape memory alloy

H. E. Karaca, S. M. Saghaian, G. Ded, H. Tobe, B. Basaran, H. J. Maier, R. D. Noebe, Y. I. Chumlyakov

Research output: Contribution to journal › Article › peer-review

247 Scopus citations

Abstract

Shape memory properties of a Ni_50.3Ti_29.7Hf ₂₀ (at.%) polycrystalline alloy were characterized after selected heat treatments. The effects of heat treatment temperature and time on the transformation temperatures (TTs) and temperature hysteresis were determined by differential scanning calorimetry. Thermal cycling under constant compressive stress was carried out to reveal the changes in transformation strain, temperature hysteresis, and TT as a function of stress. Isothermal stress cycling experiments were conducted to reveal the critical stresses, transformation strain, and stress hysteresis as a function of temperature. The crystal structure and lattice parameters of the transforming phases were determined by X-ray diffraction at selected temperatures. Precipitate characteristics and martensite morphology were revealed by transmission electron microscopy. Precipitation was found to alter the martensite morphology and significantly improve the shape memory properties of the Ni-rich NiTiHf alloy. For the peak aged condition shape memory strains of up to 3.6%, the lowest hysteresis, and a fully reversible superelastic response were observed at temperatures up to 240 C. In general, the nickel-rich NiTiHf polycrystalline alloy exhibited a higher work output (≈16.5 J cm^-3) than other NiTi-based high temperature alloys.

Original language	English
Pages (from-to)	7422-7431
Number of pages	10
Journal	Acta Materialia
Volume	61
Issue number	19
DOIs	https://doi.org/10.1016/j.actamat.2013.08.048
State	Published - Nov 2013

Bibliographical note

Funding Information:
This work was supported in part by the NASA Fundamental Aeronautics Program, Aeronautical Sciences Project and the NASA EPSCOR program under Grant NNX11AQ31A and the RFBR project with Grant 12-08-91331 NNIO-a.

Keywords

High temperature
Mechanical tests
NiTiHf
Phase transformations
Shape memory alloys

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/j.actamat.2013.08.048

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title = "Effects of nanoprecipitation on the shape memory and material properties of an Ni-rich NiTiHf high temperature shape memory alloy",

abstract = "Shape memory properties of a Ni50.3Ti29.7Hf 20 (at.%) polycrystalline alloy were characterized after selected heat treatments. The effects of heat treatment temperature and time on the transformation temperatures (TTs) and temperature hysteresis were determined by differential scanning calorimetry. Thermal cycling under constant compressive stress was carried out to reveal the changes in transformation strain, temperature hysteresis, and TT as a function of stress. Isothermal stress cycling experiments were conducted to reveal the critical stresses, transformation strain, and stress hysteresis as a function of temperature. The crystal structure and lattice parameters of the transforming phases were determined by X-ray diffraction at selected temperatures. Precipitate characteristics and martensite morphology were revealed by transmission electron microscopy. Precipitation was found to alter the martensite morphology and significantly improve the shape memory properties of the Ni-rich NiTiHf alloy. For the peak aged condition shape memory strains of up to 3.6%, the lowest hysteresis, and a fully reversible superelastic response were observed at temperatures up to 240 C. In general, the nickel-rich NiTiHf polycrystalline alloy exhibited a higher work output (≈16.5 J cm-3) than other NiTi-based high temperature alloys.",

keywords = "High temperature, Mechanical tests, NiTiHf, Phase transformations, Shape memory alloys",

author = "Karaca, {H. E.} and Saghaian, {S. M.} and G. Ded and H. Tobe and B. Basaran and Maier, {H. J.} and Noebe, {R. D.} and Chumlyakov, {Y. I.}",

note = "Funding Information: This work was supported in part by the NASA Fundamental Aeronautics Program, Aeronautical Sciences Project and the NASA EPSCOR program under Grant NNX11AQ31A and the RFBR project with Grant 12-08-91331 NNIO-a.",

year = "2013",

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doi = "10.1016/j.actamat.2013.08.048",

language = "English",

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T1 - Effects of nanoprecipitation on the shape memory and material properties of an Ni-rich NiTiHf high temperature shape memory alloy

AU - Karaca, H. E.

AU - Saghaian, S. M.

AU - Ded, G.

AU - Tobe, H.

AU - Basaran, B.

AU - Maier, H. J.

AU - Noebe, R. D.

AU - Chumlyakov, Y. I.

N1 - Funding Information: This work was supported in part by the NASA Fundamental Aeronautics Program, Aeronautical Sciences Project and the NASA EPSCOR program under Grant NNX11AQ31A and the RFBR project with Grant 12-08-91331 NNIO-a.

PY - 2013/11

Y1 - 2013/11

N2 - Shape memory properties of a Ni50.3Ti29.7Hf 20 (at.%) polycrystalline alloy were characterized after selected heat treatments. The effects of heat treatment temperature and time on the transformation temperatures (TTs) and temperature hysteresis were determined by differential scanning calorimetry. Thermal cycling under constant compressive stress was carried out to reveal the changes in transformation strain, temperature hysteresis, and TT as a function of stress. Isothermal stress cycling experiments were conducted to reveal the critical stresses, transformation strain, and stress hysteresis as a function of temperature. The crystal structure and lattice parameters of the transforming phases were determined by X-ray diffraction at selected temperatures. Precipitate characteristics and martensite morphology were revealed by transmission electron microscopy. Precipitation was found to alter the martensite morphology and significantly improve the shape memory properties of the Ni-rich NiTiHf alloy. For the peak aged condition shape memory strains of up to 3.6%, the lowest hysteresis, and a fully reversible superelastic response were observed at temperatures up to 240 C. In general, the nickel-rich NiTiHf polycrystalline alloy exhibited a higher work output (≈16.5 J cm-3) than other NiTi-based high temperature alloys.

AB - Shape memory properties of a Ni50.3Ti29.7Hf 20 (at.%) polycrystalline alloy were characterized after selected heat treatments. The effects of heat treatment temperature and time on the transformation temperatures (TTs) and temperature hysteresis were determined by differential scanning calorimetry. Thermal cycling under constant compressive stress was carried out to reveal the changes in transformation strain, temperature hysteresis, and TT as a function of stress. Isothermal stress cycling experiments were conducted to reveal the critical stresses, transformation strain, and stress hysteresis as a function of temperature. The crystal structure and lattice parameters of the transforming phases were determined by X-ray diffraction at selected temperatures. Precipitate characteristics and martensite morphology were revealed by transmission electron microscopy. Precipitation was found to alter the martensite morphology and significantly improve the shape memory properties of the Ni-rich NiTiHf alloy. For the peak aged condition shape memory strains of up to 3.6%, the lowest hysteresis, and a fully reversible superelastic response were observed at temperatures up to 240 C. In general, the nickel-rich NiTiHf polycrystalline alloy exhibited a higher work output (≈16.5 J cm-3) than other NiTi-based high temperature alloys.

KW - High temperature

KW - Mechanical tests

KW - NiTiHf

KW - Phase transformations

KW - Shape memory alloys

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Effects of nanoprecipitation on the shape memory and material properties of an Ni-rich NiTiHf high temperature shape memory alloy

Abstract

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Keywords

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