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Fastening ring made of wide thermal hysteresis Ti-Ni-based shape-memory alloy, preparation method and application thereof

A memory alloy and fastening ring technology, applied in the field of shape memory alloys, can solve the problems that TiNiNb alloy cannot meet the demand, cannot bear large diameter expansion deformation, and is inconvenient to use, and achieves light weight, good tightness, and installation. handy effect

Inactive Publication Date: 2006-04-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Ti50Ni47Fe3 alloy is a single-phase alloy, its elongation (δ.%) is relatively low, and it cannot withstand large diameter expansion deformation
After low-temperature expansion and deformation, the starting temperature A's point of the martensite reverse transformation to the parent phase is below -50°C, so the pipe joints made of it can only be expanded, stored and transported at the temperature of liquid nitrogen and installation, it is very inconvenient to use
Ti44Ni47Nb9 is a two-phase alloy, U.S. Patent No. 4770725 (1988), which consists of a matrix phase (parent phase) and a niobium-rich phase (β-Nb phase). After low-temperature deformation, its A's point is around 40°C , higher than usual room temperature, but still not ideal in hot environments
In addition, due to the limitation of alloy strength, TiNiNb alloy cannot meet the demand for high connection strength, especially when thin-walled pipe joints are required in the space where pipes are closely arranged.
A wide thermal hysteresis shape memory alloy with the addition of the fourth or fifth element has not been found after searching the patent literature

Method used

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  • Fastening ring made of wide thermal hysteresis Ti-Ni-based shape-memory alloy, preparation method and application thereof
  • Fastening ring made of wide thermal hysteresis Ti-Ni-based shape-memory alloy, preparation method and application thereof
  • Fastening ring made of wide thermal hysteresis Ti-Ni-based shape-memory alloy, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Vacuum induction furnace is used for smelting, the ingot is soaked at 800℃~1000℃ for 3 hours, hot forged at 800℃~900℃ to form a φ40mm rod, and then 800℃~900℃ hot rolled into a φ20mm rod, after 850 ℃, after 30 minutes air-cooled to room temperature, the car was made into a sample, and the mechanical properties were measured at -55 ℃, room temperature and 300 ℃ respectively. The results are listed in Table 2. In the table σ 0.2 is the yield strength, and δ is the elongation. After some samples were pre-deformed at -65°C, the shape recovery strain εr and A's temperature were measured. The results are also listed in Table 2. In the table, εt is the total pre-deformation amount, and εr is the shape recovery strain.

[0045] implement

Embodiment 2

[0047] Vacuum induction furnace is used for smelting, the ingot is soaked at 900°C for 3 hours, hot-forged at 840°C to form a φ40mm bar, and then hot-rolled at 860°C to form a φ20mm bar, after 30 minutes at 850°C, the furnace is cooled to room temperature , the samples were made by car, and the mechanical properties were measured at -55°C, room temperature and 300°C respectively, and the results are listed in Table 2. In the table, σ 0.2 is the yield strength, and δ is the elongation. After some samples were pre-deformed at -65°C, the shape recovery strain εr and A's temperature were measured. The results are also listed in Table 2. In the table, εt is the total pre-deformation amount, and εr is the shape recovery strain.

[0048] implement

[0049] figure 1 It is the metallographic structure of ordinary Ti44Ni47Nb9 ternary shape memory alloy, the white area is the matrix phase, and the black area is the eutectic area composed of the matrix phase and the niobium-ric...

Embodiment 3～5

[0051] The alloy was prepared by the method described in Example 2, and its mechanical properties at room temperature were measured. The results are shown in Table 4.

[0052]

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Abstract

The present invention discloses one kind of fastening ring of wide heat hysteresis TiNi-base shape memory alloy and its preparation and apply. The alloy consists of in atom% Ti 42-47, Ni 44-49, Nb 6-13 and Zr 0.1-3. The preparation process includes smelting in vacuum MF inducing electric furnace and casting ingot; homogenizing at 800-1000 deg.c for 3-5 hr; forging at 800-900 deg.c; hot rolling at 800-900 deg.c; annealing at 800-900 deg.c for 10-60 min and cooling inside the furnace to room temperature; and machining to obtain finished product. The present invention realizes fastening and connection by means of the recovering characteristic of shape memory alloy, and the fastening and connection method has the advantages of high strength, small connection resistance, etc.

Description

technical field [0001] The invention relates to a wide thermal hysteresis TiNi-based shape memory alloy fastening connection technology, which belongs to the field of material specialty shape memory alloys, in particular to a wide thermal hysteresis TiNi-based shape memory alloy fastening ring and its preparation method and application. Background technique [0002] At present, the connections used for wires, pipes and cables are mainly mechanical connections and the fastening of ordinary fasteners. Its disadvantages are inconvenient operation, uneven force, poor sealing, and easy deformation and failure. Especially in communication technology and signaling devices, the sealing of thin metal walls and metal, ceramic and plastic heads is often encountered. It is difficult to achieve technically through traditional brazing and mechanical fastening. [0003] Among the TiNi-based shape memory alloys in the prior art, there are only two alloys used for pipe connection: Ti50Ni47...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00B23P23/04F16L33/20
Inventor 王健金伟曹名洲
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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