Details
| Original language | English |
|---|---|
| Article number | 139025 |
| Journal | Materials Science and Engineering A |
| Volume | 776 |
| Early online date | 30 Jan 2020 |
| Publication status | Published - 3 Mar 2020 |
Abstract
The internal elastic strain resulting from an ensemble of nanoparticles in the crystal lattice of a shape memory alloy (SMA) is introduced as a key parameter into a quantitative theory of superelastic behaviour of SMA-nanoparticle composites. Experimental stress−strain loops obtained for a Co-Ni-Ga-nanoparticle system are analysed and a good agreement between the experimental and theoretical results is demonstrated. It is shown that even small (≈10−3) internal strains can lead to profound differences in stress−strain response between SMA-nanoparticle composites and “particle-free” SMA. The internal strains can enlarge the attainable value of superelastic strain, will strengthen the crystal lattice of the SMA and can give rise to high-temperature superelasticity of SMA-nanoparticle composites. The theory predicts that the larger the volume change is during the MT, the more pronounced is the influence of the nanoparticles on the superelastic behaviour of SMA.
Keywords
- High-temperature superelasticity, Nanocomposite, Shape memory alloy, Strengthening, Thermomechanical treatment
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
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In: Materials Science and Engineering A, Vol. 776, 139025, 03.03.2020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Influence of incorporated nanoparticles on superelastic behavior of shape memory alloys
AU - L'vov, Victor A.
AU - Kosogor, Anna
AU - Palamarchuk, Serafima I.
AU - Gerstein, Gregory
AU - Maier, Hans J.
N1 - Funding information: This study was supported by the German Research Foundation [grant number 388671975 ], the National Academy of Sciences of Ukraine [grant number 0117U000433 ], and the Ministry of Education and Science Ukraine [grant number 19BF052-01 ].
PY - 2020/3/3
Y1 - 2020/3/3
N2 - The internal elastic strain resulting from an ensemble of nanoparticles in the crystal lattice of a shape memory alloy (SMA) is introduced as a key parameter into a quantitative theory of superelastic behaviour of SMA-nanoparticle composites. Experimental stress−strain loops obtained for a Co-Ni-Ga-nanoparticle system are analysed and a good agreement between the experimental and theoretical results is demonstrated. It is shown that even small (≈10−3) internal strains can lead to profound differences in stress−strain response between SMA-nanoparticle composites and “particle-free” SMA. The internal strains can enlarge the attainable value of superelastic strain, will strengthen the crystal lattice of the SMA and can give rise to high-temperature superelasticity of SMA-nanoparticle composites. The theory predicts that the larger the volume change is during the MT, the more pronounced is the influence of the nanoparticles on the superelastic behaviour of SMA.
AB - The internal elastic strain resulting from an ensemble of nanoparticles in the crystal lattice of a shape memory alloy (SMA) is introduced as a key parameter into a quantitative theory of superelastic behaviour of SMA-nanoparticle composites. Experimental stress−strain loops obtained for a Co-Ni-Ga-nanoparticle system are analysed and a good agreement between the experimental and theoretical results is demonstrated. It is shown that even small (≈10−3) internal strains can lead to profound differences in stress−strain response between SMA-nanoparticle composites and “particle-free” SMA. The internal strains can enlarge the attainable value of superelastic strain, will strengthen the crystal lattice of the SMA and can give rise to high-temperature superelasticity of SMA-nanoparticle composites. The theory predicts that the larger the volume change is during the MT, the more pronounced is the influence of the nanoparticles on the superelastic behaviour of SMA.
KW - High-temperature superelasticity
KW - Nanocomposite
KW - Shape memory alloy
KW - Strengthening
KW - Thermomechanical treatment
UR - http://www.scopus.com/inward/record.url?scp=85079066100&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2020.139025
DO - 10.1016/j.msea.2020.139025
M3 - Article
AN - SCOPUS:85079066100
VL - 776
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
SN - 0921-5093
M1 - 139025
ER -