Ni-Fe-Ga-Co high-temperature magnetic-drive memory alloy
Patent Information
- Authority / Receiving Office
- CN · China
- Current Assignee / Owner
- HARBIN INST OF TECH
- Publication Date
- 2010-05-12
- Estimated Expiration
- Not applicable · inactive patent
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Abstract
Description
technical field
[0001] The invention relates to a memory alloy. Background technique
[0002] The magnetically actuated shape memory materials discovered so far mainly include: NiMnGa, NiFeGa, FePd, FePt, Ni2MnAl, CoNiX (X=Ga, Al) and NiMnX (X=In, Sn, Sb) alloys, etc. But none of them can be used as magnetically actuated shape memory alloys in the high temperature field (above 100°C). Because the main mechanism of magnetically driven shape memory alloys to generate large magnetically induced strains under the action of a magnetic field is the reorientation of the martensitic twin variants under the action of a magnetic field. Therefore, in order to apply the magnetic memory alloy in the high-temperature field, it must be satisfied that the material is in a martensite state at high temperature (martensitic transformation start temperature Ms>100°C), and at the same time, the martensite is required to have ferromagnetism (Curie temperature Tc should be much higher than th...