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Ferro-nickel-cobalt-titanium alloy with room-temperature sheet martensitic structure and preparation method thereof

A technology of martensite and iron-nickel-cobalt, which is applied in the field of heat treatment, can solve the problems of not obtaining thin-sheet martensite, not obtaining the magnetic control shape memory effect, insufficient research on the composition design of iron-nickel-cobalt-titanium alloy and heat treatment process, etc.

Inactive Publication Date: 2009-10-21
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Since the research on the composition design and heat treatment process of iron-nickel-cobalt-titanium alloy was not deep enough, the martensitic phase morphology of the alloy could not be well controlled, and the thin-sheet martensite with twin structure existing at room temperature was not obtained, so The expected magnetically controlled shape memory effect was not obtained

Method used

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  • Ferro-nickel-cobalt-titanium alloy with room-temperature sheet martensitic structure and preparation method thereof
  • Ferro-nickel-cobalt-titanium alloy with room-temperature sheet martensitic structure and preparation method thereof
  • Ferro-nickel-cobalt-titanium alloy with room-temperature sheet martensitic structure and preparation method thereof

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Embodiment

[0025] Composition: Ni: 29.05-31.88%, Co: 10-20%, Ti: 3.76-4.94%, and the rest is Fe;

[0026] Casting process: select 99.9% pure iron, 99.9% pure nickel, 99.9% pure cobalt, 99.9% pure titanium, mix according to weight percentage, and carry out vacuum arc melting or induction melting under the protection of argon to obtain block alloy materials.

[0027] Processing technology: After the alloy is cast, it is homogenized at about 1000-1200°C for 5-30 hours; forged at 900-1100°C to form a plate. Heat treatment at 1100-1200°C for 30 minutes, recrystallization treatment, and water quenching.

[0028] Aging process: The aging temperature is 500°C to 650°C, and the aging time is selected according to the change of the alloy composition. When the transformation start temperature is close to room temperature, the martensite is maintained at room temperature, with the largest amount of lamellar martensite.

[0029]As shown in Figure 2, Fig. 2 (a) is the optical metallographic photogra...

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Abstract

The invention relates to a ferro-nickel-cobalt-titanium alloy with room-temperature sheet martensitic structure in the technical field of heat treatment and a preparation method thereof. The alloy comprises the following components with weight percentage: 29 to 33 percent of Ni, 10 to 20 percent of Co, 3 to 5 percent of Ti and the balance of Fe. The invention provides a component range and aging technique of Fe-Ni-Co-Ti ferromagnetic shape memory alloy for obtaining the sheet martensitic structure. By the optimization of components and heat treatment technique, the invention can obtain sufficient sheet martensitic structures existing at room temperature, improve the temperature control shape memory effect and simultaneously have the capability of potential magnetically controlled shape memory effect.

Description

technical field [0001] The invention relates to an alloy in the technical field of heat treatment and a preparation method thereof, in particular to an iron-nickel-cobalt-titanium alloy with a room temperature lamellar martensitic structure and a preparation method thereof. Background technique [0002] Ferromagnetic shape memory alloys have attracted extensive attention due to their large output power and extremely fast response frequency. Currently, people think about Ni 2 Magneto-controlled shape memory alloys such as MnGa and FePd have been extensively studied and achieved good results. However, on the one hand, these alloys contain precious and rare metal elements, such as Ga and Pd, and there are great difficulties in smelting. For example, Mn element is easy to volatilize during smelting, and the composition is difficult to control. In addition, Ni 2 MnGa alloy is brittle and difficult to process, which affects practical use. Fe-Ni-Co-Ti alloy is considered to be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C30/00C21D1/26C21D1/18C21D1/60C21D1/00
Inventor 金学军金明江顾一嘉高一鹏丁洪
Owner SHANGHAI JIAO TONG UNIV
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