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Intermediate temperature treatment method for improving memory property of nickel-titanium-copper memory alloy

A technology of memory alloy and processing method, applied in the field of memory alloy

Inactive Publication Date: 2012-10-03
ZHENJIANG YINUOWEI SHAPE MEMORY ALLOYS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are few studies on the two-way memory effect of nickel-titanium-copper treated at medium temperature, which is crucial for the application of nickel-titanium-copper in temperature-sensitive drive components

Method used

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  • Intermediate temperature treatment method for improving memory property of nickel-titanium-copper memory alloy
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Examples

Experimental program
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Effect test

Embodiment 1

[0012] The selected composition is Ni: 50.1%wt, Ti: 44.9%wt, Cu: 5.0%wt, phase transition point A f = 53°C nickel-titanium-copper memory alloy, put the memory alloy at a medium temperature of 450°C, keep it warm for 60 minutes, and then undergo cold and hot mechanical training for 40 times. The temperature of cold water is controlled at 0°C, and the temperature of hot water is 100°C. At this time, the two-way memory recovery rate of the alloy is 87%, and the two-way memory recovery rate is basically stable after training for 40 times. figure 1 shown.

Embodiment 2

[0014] The selected composition is Ni: 49.5%wt, Ti: 44.5%wt, Cu: 6.0%wt, phase transition point A f = 96°C nickel-titanium-copper memory alloy, the memory alloy is treated at a medium temperature of 500°C, kept for 60 minutes, and then subjected to cold and hot mechanical training 40 times, the temperature of cold water is controlled at 0°C, and the temperature of hot water is 100°C. At this time, the two-way memory recovery rate of the alloy is 76%, and the two-way memory recovery rate is basically stable after training for 40 times. figure 1 shown.

Embodiment 3

[0016] The selected composition is Ni: 50.6%wt, Ti: 45.4%wt, Cu: 4.0%wt, phase transition point A f = 10°C nickel-titanium-copper memory alloy, the memory alloy is treated at a medium temperature of 400°C, kept for 60 minutes, and then subjected to cold and hot mechanical training for 40 times. The temperature of cold water is controlled at 0°C, and the temperature of hot water is 100°C. At this time, the two-way memory recovery rate of the alloy is 70%, and the two-way memory recovery rate is basically stable after training for 40 times. figure 1 shown.

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Abstract

The invention relates to an intermediate temperature treatment method for improving the memory property of a nickel-titanium-copper memory alloy, and belongs to the field of memory alloys. The method is characterized in that the nickel-titanium-copper memory alloy comprises the following components in percentage by weight: 49.5 to 50.6 percent of Ni, 44.5 to 45.4 percent of Ti and 4.0 to 6.0 percent of Cu, and the phase transition point Af is 10 to 96 DEG C. The method comprises the following steps of: performing intermediate temperature treatment on the nickel-titanium-copper memory alloy at the temperature of 400 to 500 DEG C, preserving heat for 60 minutes, and performing cold and hot mechanical training for more than 40 times, wherein the round-trip memory recovery rate of the alloy is over 70 percent.

Description

technical field [0001] The invention belongs to the field of memory alloys, in particular to a medium-temperature treatment method for improving the memory performance of nickel-titanium-copper memory alloys. Background technique [0002] In recent years, NiTi-based memory alloys have been widely used for their excellent memory effect (recovery rate), superelasticity and good machinability. In order to broaden the application range of NiTi memory alloys, a third element is often added to NiTi binary alloys. Replacing part of Ni in nickel-titanium-copper alloy with Cu makes the alloy phase transition lag and heat hysteresis decrease, the martensitic phase transition temperature is more stable, and the martensitic yield strength is reduced. Therefore, taking advantage of the narrow hysteresis characteristics of nickel-titanium-copper, nickel-titanium-copper memory alloys are often used in engineering and other fields to produce temperature-sensitive drive elements that respon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03C22C30/02C22F1/10C22F1/00
Inventor 刘光磊司松海齐克尧李晓薇陆松华
Owner ZHENJIANG YINUOWEI SHAPE MEMORY ALLOYS