Details
| Original language | English |
|---|---|
| Pages (from-to) | 963-971 |
| Number of pages | 9 |
| Journal | Journal of alloys and compounds |
| Volume | 787 |
| Early online date | 16 Feb 2019 |
| Publication status | Published - 30 May 2019 |
Abstract
The effects of stress-free and stress-assisted aging at 673 K on microstructures, thermoelastic stress-induced B2-L10 martensitic transformation and superelasticity were investigated in [001]B2-oriented Co35Ni35Al30 (at. %) single crystals in compression. The aging of quenched crystals results in the formation of high-strength nanostructured composites containing spherical nanosized particles and elongated ε-Co (HCP structure) particles, which do not undergo martensitic transformation. The stress-free and stress-assisted aged at 673 K for 0.5 h Co35Ni35Al30 crystals, oriented along [001]B2-direction, demonstrate high-yield stress levels for the B2-phase of 1360÷1630 MPa and a wide superelasticity temperature range from 193 K to 563 K with good cyclic stability and narrow stress hysteresis of Δσ = 50–60 MPa. It has been shown experimentally that a difference in the effective Young's modulus of austenite and martensite determinates a decrease in the reversible strain with a test temperature in both quenched and aged crystals. The tensile two-way shape memory effect with a reversible strain of εTWSME = +2.2% along the [001]B2-direction is induced due to the oriented growth of elongated ε-Co-particles in stress-assisted aged crystals. These results provide a clear demonstration of the potential of aged CoNiAl single crystals for applications involving high stresses and temperatures.
Keywords
- Ferromagnetic shape memory alloy, Martensitic transformation, Single crystals, Superelasticity, Two-way shape memory effect
ASJC Scopus subject areas
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
- Materials Science(all)
- Metals and Alloys
- Materials Science(all)
- Materials Chemistry
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In: Journal of alloys and compounds, Vol. 787, 30.05.2019, p. 963-971.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Compressive response of high-strength [001]-oriented single crystals of a Co35Ni35Al30 shape memory alloy
AU - Eftifeeva, Anna
AU - Panchenko, Elena
AU - Chumlyakov, Yuriy
AU - Yanushonite, Eleonora
AU - Gerstein, Gregory
AU - Maier, Hans Jürgen
N1 - Funding information: This study was supported by the RFBR [grant number 16-08-00179 ] and the Mendeleev program of TSU .
PY - 2019/5/30
Y1 - 2019/5/30
N2 - The effects of stress-free and stress-assisted aging at 673 K on microstructures, thermoelastic stress-induced B2-L10 martensitic transformation and superelasticity were investigated in [001]B2-oriented Co35Ni35Al30 (at. %) single crystals in compression. The aging of quenched crystals results in the formation of high-strength nanostructured composites containing spherical nanosized particles and elongated ε-Co (HCP structure) particles, which do not undergo martensitic transformation. The stress-free and stress-assisted aged at 673 K for 0.5 h Co35Ni35Al30 crystals, oriented along [001]B2-direction, demonstrate high-yield stress levels for the B2-phase of 1360÷1630 MPa and a wide superelasticity temperature range from 193 K to 563 K with good cyclic stability and narrow stress hysteresis of Δσ = 50–60 MPa. It has been shown experimentally that a difference in the effective Young's modulus of austenite and martensite determinates a decrease in the reversible strain with a test temperature in both quenched and aged crystals. The tensile two-way shape memory effect with a reversible strain of εTWSME = +2.2% along the [001]B2-direction is induced due to the oriented growth of elongated ε-Co-particles in stress-assisted aged crystals. These results provide a clear demonstration of the potential of aged CoNiAl single crystals for applications involving high stresses and temperatures.
AB - The effects of stress-free and stress-assisted aging at 673 K on microstructures, thermoelastic stress-induced B2-L10 martensitic transformation and superelasticity were investigated in [001]B2-oriented Co35Ni35Al30 (at. %) single crystals in compression. The aging of quenched crystals results in the formation of high-strength nanostructured composites containing spherical nanosized particles and elongated ε-Co (HCP structure) particles, which do not undergo martensitic transformation. The stress-free and stress-assisted aged at 673 K for 0.5 h Co35Ni35Al30 crystals, oriented along [001]B2-direction, demonstrate high-yield stress levels for the B2-phase of 1360÷1630 MPa and a wide superelasticity temperature range from 193 K to 563 K with good cyclic stability and narrow stress hysteresis of Δσ = 50–60 MPa. It has been shown experimentally that a difference in the effective Young's modulus of austenite and martensite determinates a decrease in the reversible strain with a test temperature in both quenched and aged crystals. The tensile two-way shape memory effect with a reversible strain of εTWSME = +2.2% along the [001]B2-direction is induced due to the oriented growth of elongated ε-Co-particles in stress-assisted aged crystals. These results provide a clear demonstration of the potential of aged CoNiAl single crystals for applications involving high stresses and temperatures.
KW - Ferromagnetic shape memory alloy
KW - Martensitic transformation
KW - Single crystals
KW - Superelasticity
KW - Two-way shape memory effect
UR - http://www.scopus.com/inward/record.url?scp=85061654679&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2019.02.185
DO - 10.1016/j.jallcom.2019.02.185
M3 - Article
AN - SCOPUS:85061654679
VL - 787
SP - 963
EP - 971
JO - Journal of alloys and compounds
JF - Journal of alloys and compounds
SN - 0925-8388
ER -