Title:
Ni-Co-Ga OR Co-Ni-Ga HEUSLER-TYPE MAGNETIC SHAPE MEMORY ALLOY AND MANUFACTURING METHOD
Document Type and Number:
Japanese Patent JP3872323
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a magnetic shape memory alloy capable of causing magnetic-field-induced martensitic phase transformation attendant on the application of external magnetic energy and capable of showing giant magnetostriction.
SOLUTION: In the Heusler-type Ni-Co-Ga or Co-Ni-Ga magnetic shape memory alloy, high crystal anisotropy is provided and high-frequency low-energy grain boundary is formed and martensitic phase transformation is induced by magnetic fields. Rapidly solidified foil of this alloy exhibits excellent bending ductility at a bending ductility test, and particularly, those having a composition ratio of Ni2CoGa or Co2NiGa are free from rupture even at 180° bending angle. Accordingly, the problem of brittleness existing in Ni2MnGa alloys can be solved.
Inventors:
Yasufumi Furuya
Sadako Okazaki
Ken Kubota
Mitsutaka Sato
Sadako Okazaki
Ken Kubota
Mitsutaka Sato
Application Number:
JP2001290285A
Publication Date:
January 24, 2007
Filing Date:
September 21, 2001
Export Citation:
Assignee:
Japan Science and Technology Agency
International Classes:
C22C19/07; H05B6/32; B22D11/00; B22D11/06; C22C1/00; C22C19/03; H05B6/44; (IPC1-7): C22C19/03; B22D11/00; B22D11/06; C22C1/00; C22C19/07; //H05B6/32; H05B6/44; C22K1:00
Domestic Patent References:
| JP11090584A | ||||
| JP11269611A | ||||
| JP2002317235A | ||||
| JP2002285269A |
Foreign References:
| WO2002064847A1 |
Other References:
Ayuela Aら,Structural properties of magnetic Heusler alloys,Journal of Physics:Condensed Matter (1999) ,No.11 Vol.8,P.2017-2026
Booth J.G.ら,Magnetic and structural phases of nickel and copper substituted cobalt-gallium alloys,Journal of Magnetism and Magnetic Materials ,Vol.1977 7 Nos.1-4,P.127-130
Booth J.G.ら,Magnetic and structural phases of nickel and copper substituted cobalt-gallium alloys,Journal of Magnetism and Magnetic Materials ,Vol.1977 7 Nos.1-4,P.127-130
Attorney, Agent or Firm:
Yoshiyuki Nishi
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