Microstructure–property relationships in a high-strength 51Ni–29Ti–20Hf shape memory alloy
Abstract
NiTiHf alloys exhibit remarkable shape memory and pseudoelastic properties that are of fundamental interest to a growing number of industries. In this study, differential scanning calorimetry and isothermal compression tests have revealed that the 51Ni–29Ti–20Hf alloy has useful shape memory properties that include a wide range of transformation temperatures as well as highly stable pseudoelastic behavior. These properties are governed by short-term aging conditions, which may be tailored to control transformation temperatures while giving rise to exceptionally high austenite yield strengths which aid transformation stability. The yield strength of the austenite phase can reach 2.1 GPa by aging for 3hrs at 500°C, while aging for 3hrs at 700°C produced an alloy with an austenite finish temperature (A f ) of 146°C. High-resolution scanning transmission electron microscopy has revealed a new precipitate phase, H-phase, under the homogenized and extruded condition and the aged 3 hrs at 500°C condition, but only the previously identified H-phase precipitate was observed after aging at temperatures of 600°C and 700°C for 3 hrs. Finally, dislocation analysis indicated that plastic deformation of the austenite phase occurred by <100> type slip, similar to that observed in binary NiTi.
- Authors:
-
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- The Ohio State Univ., Columbus, OH (United States)
- Glenn Research Center, Cleveland, OH (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1221618
- Report Number(s):
- LA-UR-15-26868
Journal ID: ISSN 0022-2461; PII: 9400
- Grant/Contract Number:
- SC0001258; AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Materials Science
- Additional Journal Information:
- Journal Name: Journal of Materials Science; Journal ID: ISSN 0022-2461
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Coughlin, D. R., Casalena, L., Yang, F., Noebe, R. D., and Mills, M. J. Microstructure–property relationships in a high-strength 51Ni–29Ti–20Hf shape memory alloy. United States: N. p., 2015.
Web. doi:10.1007/s10853-015-9400-7.
Coughlin, D. R., Casalena, L., Yang, F., Noebe, R. D., & Mills, M. J. Microstructure–property relationships in a high-strength 51Ni–29Ti–20Hf shape memory alloy. United States. https://doi.org/10.1007/s10853-015-9400-7
Coughlin, D. R., Casalena, L., Yang, F., Noebe, R. D., and Mills, M. J. Fri .
"Microstructure–property relationships in a high-strength 51Ni–29Ti–20Hf shape memory alloy". United States. https://doi.org/10.1007/s10853-015-9400-7. https://www.osti.gov/servlets/purl/1221618.
@article{osti_1221618,
title = {Microstructure–property relationships in a high-strength 51Ni–29Ti–20Hf shape memory alloy},
author = {Coughlin, D. R. and Casalena, L. and Yang, F. and Noebe, R. D. and Mills, M. J.},
abstractNote = {NiTiHf alloys exhibit remarkable shape memory and pseudoelastic properties that are of fundamental interest to a growing number of industries. In this study, differential scanning calorimetry and isothermal compression tests have revealed that the 51Ni–29Ti–20Hf alloy has useful shape memory properties that include a wide range of transformation temperatures as well as highly stable pseudoelastic behavior. These properties are governed by short-term aging conditions, which may be tailored to control transformation temperatures while giving rise to exceptionally high austenite yield strengths which aid transformation stability. The yield strength of the austenite phase can reach 2.1 GPa by aging for 3hrs at 500°C, while aging for 3hrs at 700°C produced an alloy with an austenite finish temperature (A f ) of 146°C. High-resolution scanning transmission electron microscopy has revealed a new precipitate phase, H-phase, under the homogenized and extruded condition and the aged 3 hrs at 500°C condition, but only the previously identified H-phase precipitate was observed after aging at temperatures of 600°C and 700°C for 3 hrs. Finally, dislocation analysis indicated that plastic deformation of the austenite phase occurred by <100> type slip, similar to that observed in binary NiTi.},
doi = {10.1007/s10853-015-9400-7},
journal = {Journal of Materials Science},
number = ,
volume = ,
place = {United States},
year = {Fri Sep 18 00:00:00 EDT 2015},
month = {Fri Sep 18 00:00:00 EDT 2015}
}
Web of Science
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