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Method for determining thermal impact temperature of Ti-Ni base shape memory alloy

A technology of thermal shock temperature and memory alloy, which is applied in the investigation stage/state change, sampling device, etc., can solve the problems of large error, time-consuming and laborious, low precision, etc., and achieve the effect of low cost, convenient use and high precision

Inactive Publication Date: 2006-05-03
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the thermal shock temperature of the alloy is usually measured by day and night monitoring and recording, which is time-consuming and labor-intensive, and has low precision and large errors.

Method used

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  • Method for determining thermal impact temperature of Ti-Ni base shape memory alloy
  • Method for determining thermal impact temperature of Ti-Ni base shape memory alloy
  • Method for determining thermal impact temperature of Ti-Ni base shape memory alloy

Examples

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Effect test

example 1

[0020] Ti 50 Ni 30 Cu 20 (at.%) Determination of thermal shock temperature of shape memory alloy (the martensite of the alloy is an orthogonal B19 structure), such as image 3 As shown, its working steps are:

[0021] (1) Cut the sample, cool it with coolant, and receive thermal shock in the martensitic reverse phase transformation temperature range. The wire cutting diameter of the titanium-nickel-based shape memory alloy is Φ3×0.7mm 2 thin slice samples;

[0022] (2) Clean the sample, adopt ultrasonic cleaning sample in chemical pure alcohol and acetone respectively for 20 minutes, then use deionized water, adopt ultrasonic cleaning for 15 minutes, then dry for later use;

[0023] (3) To measure the phase transition curve, put the sample into a differential scanning calorimeter (DSC) to measure its phase transition curve at a rate of temperature rise and temperature drop of 10°C / min respectively;

[0024] (4) Determination of the temperature of the demarcation point, an...

example 2

[0027] Ti 50.4 Ni 49.6 (at.%) Determination of thermal shock temperature of shape memory alloy (the martensite of the alloy is monoclinic B19' structure), such as Figure 4 As shown, its working steps are:

[0028] (1) with example 1;

[0029] (2) with example 1;

[0030] (3) with example 1;

[0031] (4) Determination of the temperature of the demarcation point, and determination of the demarcation point temperature T of the phase transformation process in the martensitic inverse transformation curve S 95.5°C;

[0032] (5) Determine the thermal shock temperature, thermal shock temperature T A is the cut-off point temperature T S 95.5°C minus 3.2°C equals 92.3°C.

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Abstract

The invention relates to a method for measuring titanium nickel basic mode memory alloy heat shock temperature which is relative to the demarcation temperature: the heat shock temperature of TiNi mode memory alloy is below the demarcation temperature 3.2í‚0.2 deg.; the heat shock temperature of the TiNiCu mode memory alloy is below the demarcation temperature 1.1í‚0.2 deg.; using the temperature changing rule, it can measure the heat shock temperature as following steps: (1) cutting the sample; (2) cleaning the sample; (3) measuring the phase-change curve; (4) measuring the demarcation temperature; (5) ascertaining the heat shock temperature.

Description

technical field [0001] The invention belongs to the measurement technology of titanium-nickel shape memory alloys, in particular to a method for measuring the thermal shock temperature of titanium-nickel-based shape memory alloys. Background technique [0002] Titanium-nickel shape memory alloy has been widely used in aerospace, aviation, electronics, machinery, medicine and other engineering and technical fields due to its special shape memory effect and superelasticity. The shape memory effect and superelasticity of titanium-nickel shape memory alloys are closely related to the phase transition characteristics of the alloy, and thermal shock has a great influence on the phase transformation process of titanium-nickel-based shape memory alloys. If this alloy is used to make precision sensitive components such as thermal drivers, the staged phase transformation caused by thermal shock will directly affect the driving performance. Therefore, it is important to determine the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/02G01N1/04
Inventor 李永华王承志李玉海
Owner SHENYANG LIGONG UNIV