TY - JOUR
T1 - Martensitic Transformation and Superelasticity in Fe–Mn–Al-Based Shape Memory Alloys
AU - Omori, Toshihiro
AU - Kainuma, Ryosuke
N1 - Funding Information:
The authors acknowledge the support from JSPS KAKENHI Grant Nos. JP15H05766 and JP26289226. We also thank our many colleagues for stimulating discussion, among whom K. Ando, M. Nagasako, I. Ohnuma, and K. Ishida deserve special mention.
Funding Information:
The authors acknowledge the support from JSPS KAKENHI Grant Nos. JP15H05766 and JP26289226. We also thank our many colleagues for stimulating discussion, among whom K. Ando, M. Nagasako, I. Ohnuma, and K. Ishida deserve special mention.
Publisher Copyright:
© 2017, ASM International.
PY - 2017/12/1
Y1 - 2017/12/1
N2 - Ferrous shape memory alloys showing superelasticity have recently been obtained in two alloy systems in the 2010s. One is Fe–Mn–Al–Ni, which undergoes martensitic transformation (MT) between the α (bcc) parent and γ′ (fcc) martensite phases. This MT can be thermodynamically understood by considering the magnetic contribution to the Gibbs energy, and the β-NiAl (B2) nanoprecipitates play an important role in the thermoelastic MT. The temperature dependence of critical stress for the MT is very small (about 0.5 MPa/°C) due to the small entropy difference between the parent and martensite phases in the Fe–Mn–Al–Ni alloy, and consequently, superelasticity can be obtained in a wide temperature range from cryogenic temperature to about 200 °C. Microstructural control is of great importance for obtaining superelasticity, and the relative grain size is among the most crucial factors.
AB - Ferrous shape memory alloys showing superelasticity have recently been obtained in two alloy systems in the 2010s. One is Fe–Mn–Al–Ni, which undergoes martensitic transformation (MT) between the α (bcc) parent and γ′ (fcc) martensite phases. This MT can be thermodynamically understood by considering the magnetic contribution to the Gibbs energy, and the β-NiAl (B2) nanoprecipitates play an important role in the thermoelastic MT. The temperature dependence of critical stress for the MT is very small (about 0.5 MPa/°C) due to the small entropy difference between the parent and martensite phases in the Fe–Mn–Al–Ni alloy, and consequently, superelasticity can be obtained in a wide temperature range from cryogenic temperature to about 200 °C. Microstructural control is of great importance for obtaining superelasticity, and the relative grain size is among the most crucial factors.
KW - Abnormal grain growth
KW - Entropy of transformation
KW - Equilibrium temperature
KW - Ferrous shape memory alloy
KW - Fe–Mn–Al–Ni
KW - Nanoprecipitation
KW - Thermoelastic
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U2 - 10.1007/s40830-017-0129-9
DO - 10.1007/s40830-017-0129-9
M3 - Article
AN - SCOPUS:85050867002
VL - 3
SP - 322
EP - 334
JO - Shape Memory and Superelasticity
JF - Shape Memory and Superelasticity
SN - 2199-384X
IS - 4
ER -