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High-temperature titanium-nickel-based quaternary memory alloy

A memory alloy and high-temperature technology, which is applied in the field of high-temperature titanium-nickel-based quaternary memory alloys, can solve the problems of narrow application fields and low phase transition temperature, and achieve the effects of good processability, low cost and good memory performance

Inactive Publication Date: 2018-05-29
西安赛特思迈钛业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of high-temperature titanium-nickel base quaternary memory alloy, to solve the problem of low phase transition temperature and narrow application field of nearly equiatomic ratio titanium-nickel Ti-Ni alloy (48at%~52at%Ni)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Using sponge titanium, sponge hafnium, electrolytic nickel, titanium silicon alloy as raw materials, according to the nominal composition Ti 35.85 Ni 49 Hf 15 Si 0.15 (atomic percentage at%) to prepare the alloy material. The alloy materials are mixed and pressed into electrode blocks, and the electrode blocks are welded into consumable electrodes by vacuum plasma welding. The vacuum consumable arc melting furnace melts three times to form a Φ360mm titanium alloy ingot. The cast ingot is forged at 930°C for 2 hours, and then forged into a square bar of 120*120*L by secondary fire. The hot rolling is carried out on a 250 row type. The hot rolling process is 870 ° C for 40 minutes, and the Φ9.0mm strip is rolled out of a 120*120*L square bar in multiple fires. The strip is prepared by peeling and drawing processes. into 3.0mm wire.

[0020] The wire was quenched in water at 830°C for 30 minutes, and after solution treatment, the phase transition temperature was meas...

Embodiment 2

[0024] Adopt the TiNiHfSi wire material that embodiment 1 prepares, prepare high-temperature pressure spring, and its spring parameter is as follows:

[0025] Spring middle diameter: 27mm, material diameter: 3mm, spring pitch: 15mm, effective number of turns: 12.5, free height: 192mm.

[0026] After the spring has been memory-processed at 500 degrees, the phase transition temperature tends to be stable after 5 thermal cycles, Af’=202°C, which is 25°C lower than the phase transition temperature Af=227°C of this certificate.

[0027] The spring force test data is as follows:

[0028] The external force required for compaction at room temperature is 0.4kgs; at a temperature above 202°C, when the reduction is 20mm, the load capacity can reach 3.7kg, and the load difference is 3.3kg.

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Abstract

The invention discloses high-temperature titanium-nickel-based quaternary memory alloy. The high-temperature titanium-nickel-based quaternary memory alloy comprises, by atom, 48%-50% of Ni, 5%-20% ofHf, 0.10%-0.30% of Si and the balance titanium and impurities, wherein the total atomic percentage of all elements in the impurities is smaller than or equal to 0.20%, the atomic percentage of carbonis smaller than or equal to 0.05%, the atomic percentage of nitrogen and oxygen is smaller than or equal to 0.05%, and the atomic percentage of hydrogen is smaller than or equal to 0.01%. The high-temperature titanium-nickel-based quaternary memory alloy breaks through the limitation of an existing use temperature range, Af can be controlled within 100-300 DEG C, and the situations are avoided that for titanium-rich Ti-Ni-Hf alloy, the phase transformation temperature cannot be increased through aging treatment or reach 300 DEG C or above, and the Hf content is low; the high-temperature titanium-nickel-based quaternary memory alloy is low in cost, high in processability and excellent in memory performance.

Description

【Technical field】 [0001] The invention relates to the technical field of titanium-nickel alloy processing, in particular to a high-temperature titanium-nickel-based quaternary memory alloy. 【Background technique】 [0002] The phase transition temperature Ms of near equiatomic ratio titanium-nickel Ti-Ni alloy (48at%~52at%Ni) is between -20℃~100℃, usually it can only be used at a temperature lower than 100℃, which limits its application field . In order to meet the application under high temperature conditions, such as fire protection device, high temperature drive, overheating alarm, etc., the phase transition temperature must be increased, and a third element such as Au, Pt, Pd, Hf and Zr is often added to form a ternary alloy. [0003] Among them, the Ti-Ni-Hf alloy obtained by substituting hafnium (Hf) for Ti with the same period is more comprehensive than Ti-Ni-Au, Ti-Ni-Pt, Ti-Ni-Pd and Ti-Ni-Pd in ​​terms of price, processing performance and memory performance. Terna...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/03C22F1/00
CPCC22C30/00C22C1/023C22C1/03C22C19/007C22C19/03C22C27/00C22F1/006
Inventor 杨宏进杨晓康罗斌莉王海魏芬绒金旭丹毛江虹
Owner 西安赛特思迈钛业有限公司