Details
| Original language | English |
|---|---|
| Pages (from-to) | 298-304 |
| Number of pages | 7 |
| Journal | Acta materialia |
| Volume | 89 |
| Publication status | Published - 26 Feb 2015 |
Abstract
High-temperature shape memory alloys are attractive for efficient solid state actuation. A key criterion for shape memory alloys is the martensite start temperature. The current study introduces a concept for increasing this temperature of alloys initially not suited for high-temperature actuation. Aging of stress-induced martensite, referred to as SIM-aging in the current work, is able to increase the martensite start temperature by about 130 °C as demonstrated in the present study for a Co-Ni-Ga shape memory alloy. The increase of transformation temperatures can be explained based on the concept of symmetry-conforming short-range order. Following SIM-aging the Co-Ni-Ga alloy shows cyclic actuation stability at elevated temperatures. While martensite aging has always been viewed as detrimental in the past, it can actually be exploited to design new classes of high-temperature shape memory alloys with excellent properties.
Keywords
- Actuation, Functional stability, Microstructure, Pseudoelasticity, Shape memory
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Materials Science(all)
- Ceramics and Composites
- Materials Science(all)
- Polymers and Plastics
- Materials Science(all)
- Metals and Alloys
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In: Acta materialia, Vol. 89, 26.02.2015, p. 298-304.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Martensite aging
T2 - Avenue to new high temperature shape memory alloys
AU - Niendorf, Thomas
AU - Krooß, Philipp
AU - Somsen, Christoph
AU - Eggeler, Gunther
AU - Chumlyakov, Yuri I.
AU - Maier, Hans J.
N1 - Funding information: Financial support by Deutsche Forschungsgemeinschaft within the Research Unit Program “Hochtemperatur-Formgedächtnislegierungen” (Contract Nos. NI1327/3-1 ; EG101/22-1 ; MA1175/34-1 ) is gratefully acknowledged.
PY - 2015/2/26
Y1 - 2015/2/26
N2 - High-temperature shape memory alloys are attractive for efficient solid state actuation. A key criterion for shape memory alloys is the martensite start temperature. The current study introduces a concept for increasing this temperature of alloys initially not suited for high-temperature actuation. Aging of stress-induced martensite, referred to as SIM-aging in the current work, is able to increase the martensite start temperature by about 130 °C as demonstrated in the present study for a Co-Ni-Ga shape memory alloy. The increase of transformation temperatures can be explained based on the concept of symmetry-conforming short-range order. Following SIM-aging the Co-Ni-Ga alloy shows cyclic actuation stability at elevated temperatures. While martensite aging has always been viewed as detrimental in the past, it can actually be exploited to design new classes of high-temperature shape memory alloys with excellent properties.
AB - High-temperature shape memory alloys are attractive for efficient solid state actuation. A key criterion for shape memory alloys is the martensite start temperature. The current study introduces a concept for increasing this temperature of alloys initially not suited for high-temperature actuation. Aging of stress-induced martensite, referred to as SIM-aging in the current work, is able to increase the martensite start temperature by about 130 °C as demonstrated in the present study for a Co-Ni-Ga shape memory alloy. The increase of transformation temperatures can be explained based on the concept of symmetry-conforming short-range order. Following SIM-aging the Co-Ni-Ga alloy shows cyclic actuation stability at elevated temperatures. While martensite aging has always been viewed as detrimental in the past, it can actually be exploited to design new classes of high-temperature shape memory alloys with excellent properties.
KW - Actuation
KW - Functional stability
KW - Microstructure
KW - Pseudoelasticity
KW - Shape memory
UR - http://www.scopus.com/inward/record.url?scp=84923367270&partnerID=8YFLogxK
U2 - 10.1016/j.actamat.2015.01.042
DO - 10.1016/j.actamat.2015.01.042
M3 - Article
AN - SCOPUS:84923367270
VL - 89
SP - 298
EP - 304
JO - Acta materialia
JF - Acta materialia
SN - 1359-6454
ER -