Shape memory and magnetic properties of Co-Al ferromagnetic shape memory alloys

T. Omori; Y. Sutou; K. Oikawa; R. Kainuma; K. Ishida

doi:10.1016/j.msea.2005.12.068

Shape memory and magnetic properties of Co-Al ferromagnetic shape memory alloys

T. Omori, Y. Sutou, K. Oikawa, R. Kainuma, K. Ishida

Tohoku University

Research output: Contribution to journal › Article › peer-review

39 Citations (Scopus)

Abstract

Martensitic transformation from the face-centered cubic to the hexagonal close-packed structure, shape memory (SM) effect and magnetic properties in the Co-14 at.% Al alloy were investigated and the microstructures of the martensite were examined using transmission electron microscopy. It was found that the SM effect occurs at temperatures between 200 and 300 °C corresponding to the reverse transformation temperatures, and that a metastable L1₂-structured phase is formed in Co-14 at.% Al aged at 600 °C. The magnetic properties were measured by a vibrating sample magnetometer, and the Curie temperature and saturation magnetization were determined to be 689 °C and 120 emu/g at 25 °C. All these results indicate that Co-Al alloys can be listed as a new class of ferromagnetic SM alloys.

Original language	English
Pages (from-to)	1045-1049
Number of pages	5
Journal	Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume	438-440
Issue number	SPEC. ISS.
DOIs	https://doi.org/10.1016/j.msea.2005.12.068
Publication status	Published - 2006 Nov 25

Keywords

Cobalt-aluminum
Ferromagnetic shape memory alloy
L1 phase
ε martensite

Access to Document

10.1016/j.msea.2005.12.068

Cite this

@article{11a16edbf22b43f2a696bc9ec71bfc9a,

title = "Shape memory and magnetic properties of Co-Al ferromagnetic shape memory alloys",

abstract = "Martensitic transformation from the face-centered cubic to the hexagonal close-packed structure, shape memory (SM) effect and magnetic properties in the Co-14 at.% Al alloy were investigated and the microstructures of the martensite were examined using transmission electron microscopy. It was found that the SM effect occurs at temperatures between 200 and 300 °C corresponding to the reverse transformation temperatures, and that a metastable L12-structured phase is formed in Co-14 at.% Al aged at 600 °C. The magnetic properties were measured by a vibrating sample magnetometer, and the Curie temperature and saturation magnetization were determined to be 689 °C and 120 emu/g at 25 °C. All these results indicate that Co-Al alloys can be listed as a new class of ferromagnetic SM alloys.",

keywords = "Cobalt-aluminum, Ferromagnetic shape memory alloy, L1 phase, ε martensite",

author = "T. Omori and Y. Sutou and K. Oikawa and R. Kainuma and K. Ishida",

note = "Funding Information: This work was supported by Grant-in-aid for Scientific Research from the Ministry of Education, Science, Sports and Culture, Japan. The support from CREST, Japan Science and Technology Agency is also acknowledged.",

year = "2006",

month = nov,

day = "25",

doi = "10.1016/j.msea.2005.12.068",

language = "English",

volume = "438-440",

pages = "1045--1049",

journal = "Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing",

issn = "0921-5093",

publisher = "Elsevier BV",

number = "SPEC. ISS.",

}

TY - JOUR

T1 - Shape memory and magnetic properties of Co-Al ferromagnetic shape memory alloys

AU - Omori, T.

AU - Sutou, Y.

AU - Oikawa, K.

AU - Kainuma, R.

AU - Ishida, K.

N1 - Funding Information: This work was supported by Grant-in-aid for Scientific Research from the Ministry of Education, Science, Sports and Culture, Japan. The support from CREST, Japan Science and Technology Agency is also acknowledged.

PY - 2006/11/25

Y1 - 2006/11/25

N2 - Martensitic transformation from the face-centered cubic to the hexagonal close-packed structure, shape memory (SM) effect and magnetic properties in the Co-14 at.% Al alloy were investigated and the microstructures of the martensite were examined using transmission electron microscopy. It was found that the SM effect occurs at temperatures between 200 and 300 °C corresponding to the reverse transformation temperatures, and that a metastable L12-structured phase is formed in Co-14 at.% Al aged at 600 °C. The magnetic properties were measured by a vibrating sample magnetometer, and the Curie temperature and saturation magnetization were determined to be 689 °C and 120 emu/g at 25 °C. All these results indicate that Co-Al alloys can be listed as a new class of ferromagnetic SM alloys.

AB - Martensitic transformation from the face-centered cubic to the hexagonal close-packed structure, shape memory (SM) effect and magnetic properties in the Co-14 at.% Al alloy were investigated and the microstructures of the martensite were examined using transmission electron microscopy. It was found that the SM effect occurs at temperatures between 200 and 300 °C corresponding to the reverse transformation temperatures, and that a metastable L12-structured phase is formed in Co-14 at.% Al aged at 600 °C. The magnetic properties were measured by a vibrating sample magnetometer, and the Curie temperature and saturation magnetization were determined to be 689 °C and 120 emu/g at 25 °C. All these results indicate that Co-Al alloys can be listed as a new class of ferromagnetic SM alloys.

KW - Cobalt-aluminum

KW - Ferromagnetic shape memory alloy

KW - L1 phase

KW - ε martensite

UR - http://www.scopus.com/inward/record.url?scp=33750427869&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33750427869&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2005.12.068

DO - 10.1016/j.msea.2005.12.068

M3 - Article

AN - SCOPUS:33750427869

SN - 0921-5093

VL - 438-440

SP - 1045

EP - 1049

JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

IS - SPEC. ISS.

ER -

Shape memory and magnetic properties of Co-Al ferromagnetic shape memory alloys

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this