Precipitation and thermal fatigue in Ni-Ti-Zr shape memory alloy thin films by combinatorial nanocalorimetry

Patrick J. McCluskey; Chunwang Zhao; Ofer Kfir; Joost J. Vlassak

doi:10.1016/j.actamat.2011.04.043

Precipitation and thermal fatigue in Ni-Ti-Zr shape memory alloy thin films by combinatorial nanocalorimetry

Patrick J. McCluskey, Chunwang Zhao, Ofer Kfir, Joost J. Vlassak

School of Electrical Engineering

Tel Aviv University

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

Abstract

Thin-film samples of Ni-Ti-Zr shape memory alloys were studied by combinatorial nanocalorimetry to determine the effects of high-temperature (900 °C) heat treatments and low-temperature (450 °C) thermal cycling on the characteristics of the martensite transformation. The response of the samples to heat treatments depends on composition and is controlled by a precipitation mechanism. Two precipitate types, a Ti₂Ni-base phase at low Zr concentration and a Ni₁₀Zr₇-base phase at high Zr concentration, affect the martensite transformation characteristics by altering the composition and the stress state of the shape memory phase. Thermal fatigue behavior, induced by thermal cycling, is improved compared to previous results. The most stable sample demonstrates a transformation temperature reduction of just 11 °C for 100 cycles. The improved stability of the samples is attributed to the very small grain size of approximately 5-20 nm. The high heating and cooling rates characteristic of nanocalorimeters allowed this study to be performed in a high-throughput manner with efficiencies not previously achieved.

Original language	English
Pages (from-to)	5116-5124
Number of pages	9
Journal	Acta Materialia
Volume	59
Issue number	13
DOIs	https://doi.org/10.1016/j.actamat.2011.04.043
State	Published - Aug 2011

Keywords

Nanocalorimetry
Nanocrystalline material
Plastic deformation
Precipitation
Shape memory alloys

All Science Journal Classification (ASJC) codes

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

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10.1016/j.actamat.2011.04.043

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@article{d73881998bd54ef8ad4ee69aca9b4b42,

title = "Precipitation and thermal fatigue in Ni-Ti-Zr shape memory alloy thin films by combinatorial nanocalorimetry",

abstract = "Thin-film samples of Ni-Ti-Zr shape memory alloys were studied by combinatorial nanocalorimetry to determine the effects of high-temperature (900 °C) heat treatments and low-temperature (450 °C) thermal cycling on the characteristics of the martensite transformation. The response of the samples to heat treatments depends on composition and is controlled by a precipitation mechanism. Two precipitate types, a Ti2Ni-base phase at low Zr concentration and a Ni10Zr7-base phase at high Zr concentration, affect the martensite transformation characteristics by altering the composition and the stress state of the shape memory phase. Thermal fatigue behavior, induced by thermal cycling, is improved compared to previous results. The most stable sample demonstrates a transformation temperature reduction of just 11 °C for 100 cycles. The improved stability of the samples is attributed to the very small grain size of approximately 5-20 nm. The high heating and cooling rates characteristic of nanocalorimeters allowed this study to be performed in a high-throughput manner with efficiencies not previously achieved.",

keywords = "Nanocalorimetry, Nanocrystalline material, Plastic deformation, Precipitation, Shape memory alloys",

author = "McCluskey, {Patrick J.} and Chunwang Zhao and Ofer Kfir and Vlassak, {Joost J.}",

note = "Funding Information: This work was supported by the Air Force Office of Scientific Research under Grant FA9550-08-1-0374, and by the Materials Research Science and Engineering Center at Harvard University. It was performed in part at the Center for Nanoscale Systems at Harvard University, which is supported by the National Science Foundation under Award No. ECS-0335765.",

year = "2011",

month = aug,

doi = "10.1016/j.actamat.2011.04.043",

language = "الإنجليزيّة",

volume = "59",

pages = "5116--5124",

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AU - McCluskey, Patrick J.

AU - Zhao, Chunwang

AU - Kfir, Ofer

AU - Vlassak, Joost J.

N1 - Funding Information: This work was supported by the Air Force Office of Scientific Research under Grant FA9550-08-1-0374, and by the Materials Research Science and Engineering Center at Harvard University. It was performed in part at the Center for Nanoscale Systems at Harvard University, which is supported by the National Science Foundation under Award No. ECS-0335765.

PY - 2011/8

Y1 - 2011/8

N2 - Thin-film samples of Ni-Ti-Zr shape memory alloys were studied by combinatorial nanocalorimetry to determine the effects of high-temperature (900 °C) heat treatments and low-temperature (450 °C) thermal cycling on the characteristics of the martensite transformation. The response of the samples to heat treatments depends on composition and is controlled by a precipitation mechanism. Two precipitate types, a Ti2Ni-base phase at low Zr concentration and a Ni10Zr7-base phase at high Zr concentration, affect the martensite transformation characteristics by altering the composition and the stress state of the shape memory phase. Thermal fatigue behavior, induced by thermal cycling, is improved compared to previous results. The most stable sample demonstrates a transformation temperature reduction of just 11 °C for 100 cycles. The improved stability of the samples is attributed to the very small grain size of approximately 5-20 nm. The high heating and cooling rates characteristic of nanocalorimeters allowed this study to be performed in a high-throughput manner with efficiencies not previously achieved.

AB - Thin-film samples of Ni-Ti-Zr shape memory alloys were studied by combinatorial nanocalorimetry to determine the effects of high-temperature (900 °C) heat treatments and low-temperature (450 °C) thermal cycling on the characteristics of the martensite transformation. The response of the samples to heat treatments depends on composition and is controlled by a precipitation mechanism. Two precipitate types, a Ti2Ni-base phase at low Zr concentration and a Ni10Zr7-base phase at high Zr concentration, affect the martensite transformation characteristics by altering the composition and the stress state of the shape memory phase. Thermal fatigue behavior, induced by thermal cycling, is improved compared to previous results. The most stable sample demonstrates a transformation temperature reduction of just 11 °C for 100 cycles. The improved stability of the samples is attributed to the very small grain size of approximately 5-20 nm. The high heating and cooling rates characteristic of nanocalorimeters allowed this study to be performed in a high-throughput manner with efficiencies not previously achieved.

KW - Nanocalorimetry

KW - Nanocrystalline material

KW - Plastic deformation

KW - Precipitation

KW - Shape memory alloys

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DO - 10.1016/j.actamat.2011.04.043

M3 - مقالة

SN - 1359-6454

VL - 59

SP - 5116

EP - 5124

JO - Acta Materialia

JF - Acta Materialia

IS - 13

ER -

Precipitation and thermal fatigue in Ni-Ti-Zr shape memory alloy thin films by combinatorial nanocalorimetry

Abstract

Keywords

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