CN1766593A - Method for determining thermal impact temperature of Ti-Ni base shape memory alloy - Google Patents
Method for determining thermal impact temperature of Ti-Ni base shape memory alloy Download PDFInfo
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- CN1766593A CN1766593A CN 200510047398 CN200510047398A CN1766593A CN 1766593 A CN1766593 A CN 1766593A CN 200510047398 CN200510047398 CN 200510047398 CN 200510047398 A CN200510047398 A CN 200510047398A CN 1766593 A CN1766593 A CN 1766593A
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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 3.2+/-0.2 deg.; the heat shock temperature of the TiNiCu mode memory alloy is below the demarcation temperature 1.1+/-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
The invention belongs to the determination techniques of Ti-Ni marmem, particularly a kind of assay method of thermal impact temperature of Ti-Ni base shape memory alloy.
Background technology
Ti-Ni marmem has been widely used in field of engineering technology such as space flight, aviation, electronics, machinery, medical science owing to have characteristics such as special SME, super-elasticity.These characteristics such as the SME of Ti-Ni marmem, super-elasticity are all closely related with the phase-change characteristic of this alloy, and thermal shock has bigger influence to the phase transition process of the Ni-based marmem of titanium.If use this alloy to make accurate sensitive element such as hot driver etc., the phase transformation stage by stage that thermal shock caused directly influences driveability.Therefore, it is very important to measure the caloric impact temperature of this alloy.But the caloric impact temperature of measuring this alloy at present normally adopts the assay method of monitoring record round the clock, waste time and energy, and precision is low, error is big.The present invention proposes the substantial connection of caloric impact temperature and separation temperature, can determine the titanium caloric impact temperature in Ni-based marmem reverse transformation stage quickly and easily.
Summary of the invention
The technical matters that exists when the objective of the invention is at Ti-Ni marmem mensuration caloric impact temperature, provide that a kind of assay method is simple and reliable, precision is high, minute is short, the assay method of easy to use, thermal impact temperature of Ti-Ni base shape memory alloy that cost is low, and it is very little to the product influence, materialsing only needs 10～50mg, measure precision up to 1 ℃ in.
Principle of work of the present invention is: the phase transformation of the Ni-based marmem of titanium is relevant with austenite and Martensite Transformation.If the marmem of heating low temperature phase (martensite) state more than the temperature, is the martensite reverse transformation from martensite to austenitic phase transition process to high temperature phase (austenite) promptly; If the marmem of cooling down high-temperature phase (austenite) state below the temperature, is the martensite phase transformation from austenite to the Martensite Transformation process to low temperature phase (martensite) promptly.In the reverse transformation process temperature be heated to that austenite phase transformation begins and end temp between a certain numerical value after lower the temperature, then this phenomenon is called thermal shock.And the dynamics separation phase transition phenomena stage by stage appears, i.e. in martensite reverse transformation process.Find between caloric impact temperature and the separation temperature closely relatedly after deliberation, promptly the caloric impact temperature of TiNi marmem is lower 3.2 ± 0.2 ℃ than separation temperature; The caloric impact temperature of TiNiCu marmem is lower 1.1 ± 0.2 ℃ than separation temperature, utilizes this temperature changing regularity, can measure the caloric impact temperature of the Ni-based marmem of titanium simple and convenient, exactly.
The assay method of thermal impact temperature of Ti-Ni base shape memory alloy of the present invention, its job step is:
(1) cuts sample, adopt the liquid coolant cooling, be subjected to cutting diameter on the Ni-based marmem of titanium of thermal shock in martensite reverse transformation temperature range or width is 3～5mm, weigh the thin slice sample of 10～50mg;
(2) washed samples adopted the ultrasonic cleaning sample 10～20 minutes respectively in chemical pure alcohol, acetone, use deionized water again, adopted ultrasonic cleaning 10～20 minutes, dried standby then;
(3) measuring transformation curve, is 5～15 ℃/min with heating-cooling speed respectively with sample, puts into differential scanning calorimeter (DSC) and measures its transformation curve;
(4) measure the separation temperature, measure the separation temperature of phase transition process in the martensite reverse transformation curve;
(5) determine caloric impact temperature, the caloric impact temperature of TiNi marmem is than low 3.2 ± 0.2 ℃ of the separation temperature in the martensite reverse transformation curve; The caloric impact temperature of TiNiCu marmem is than low 1.1 ± 0.2 ℃ of the separation temperature in the martensite reverse transformation curve.
The present invention has that assay method is simple and reliable, precision is high, minute is short, easy to use, low cost and other advantages, and very little to the product influence, and materialsing only needs 10～50mg, measure precision up to 1 ℃ in.
Description of drawings
Fig. 1 is Ti
50Ni
30Cu
20(at.%) the typical DSC curves of transition figure of marmem
Fig. 2 is thermal shock process and Ti
50Ni
30Cu
20(at.%) the DSC curves of transition figure of marmem;
Fig. 3 is the Ti of separation temperature when being 62.6 ℃
50Ni
30Cu
20(at.%) the DSC curves of transition figure of marmem;
Fig. 4 is the Ti of separation temperature when being 95.5 ℃
50.4Ni
49.6(at.%) the DSC curves of transition figure of marmem;
Embodiment
Further specify assay method of the present invention and principle of work in conjunction with example.
As shown in Figure 1, Ti
50Ni
30Cu
20(at.%) the typical DSC curves of transition figure of marmem, wherein a is a martensite reverse transformation process, and promptly martensite is to austenitic single phase transition process, and corresponding is heating process; B is a martensite phase transformation process, and promptly austenite is to martensitic single phase transition process, and corresponding is cooling procedure.
If in the reverse transformation process temperature be heated to that austenite phase transformation begins and end temp between a certain numerical value (as T among Fig. 2
A60.0 ℃ of points) end the back cooling, this phenomenon is called thermal shock.And in martensite reverse transformation process subsequently, understand the phase transition phenomena that occurs stage by stage, as shown in Figure 2, transformation curve has tangible dynamics separation (as T among Fig. 2
S61.1 ℃ of points).Studies show that, for the TiNiCu marmem, caloric impact temperature T
AThan this separation temperature T
SLow about 1.1 ℃; And for the TiNi marmem, caloric impact temperature T
AThan separation temperature T
SLow about 3.2 ℃, two temperature are closely related, and the content of the substantial connection of these two temperature and the Ni-based shape memory alloy component of titanium is irrelevant.Caloric impact temperature among Fig. 2 is 60.0 ℃, and the separation temperature in the DSC reverse transformation curve of being measured is 61.1 ℃, and caloric impact temperature is lower 1.1 ℃ than separation temperature.Promptly can determine caloric impact temperature by measuring the separation temperature.This phenomenon is with martensitic relevant from the variant of cooperating.The present invention is clear and definite thermal shock process and caloric impact temperature notion can be determined the titanium caloric impact temperature in Ni-based marmem reverse transformation stage quickly and easily.
Example 1:
Ti
50Ni
30Cu
20(at.%) assay method of marmem (martensite of this alloy is quadrature B19 structure) caloric impact temperature, as shown in Figure 3, its job step is:
(1) cuts sample, adopt the liquid coolant cooling, the Ni-based marmem of titanium that is subjected to thermal shock in the martensite reverse transformation temperature range cutting diameter Φ 3 * 0.7mm that reaches the standard grade
2The thin slice sample;
(2) washed samples adopted the ultrasonic cleaning sample 20 minutes respectively in chemical pure alcohol, acetone, use deionized water again, adopted ultrasonic cleaning 15 minutes, dried standby then;
(3) measure transformation curve, sample is respectively the speed of 10 ℃/min with temperature rise and temperature drop, put into its transformation curve of differential scanning calorimeter (DSC) mensuration;
(4) measure the separation temperature, measure the separation temperature T of phase transition process in the martensite reverse transformation curve
SIt is 62.6 ℃;
(5) determine caloric impact temperature, caloric impact temperature T
ABe the separation temperature T
S62.6 ℃ deducting 1.1 ℃ equals 61.5 ℃.
Example 2:
Ti
50.4Ni
49.6(at.%) assay method of marmem (martensite of this alloy is monocline B19 ' structure) caloric impact temperature, as shown in Figure 4, its job step is:
(1) with example 1;
(2) with example 1;
(3) with example 1;
(4) measure the separation temperature, measure the separation temperature T of phase transition process in the martensite reverse transformation curve
SIt is 95.5 ℃;
(5) determine caloric impact temperature, caloric impact temperature T
ABe the separation temperature T
S95.5 ℃ deducting 3.2 ℃ equals 92.3 ℃.
Claims (1)
1, the assay method of thermal impact temperature of Ti-Ni base shape memory alloy is characterized in that, and is closely related between caloric impact temperature and the separation temperature, and promptly the caloric impact temperature of TiNi marmem is lower 3.2 ± 0.2 ℃ than separation temperature; The caloric impact temperature of TiNiCu marmem is lower 1.1 ± 0.2 ℃ than separation temperature, utilizes this temperature changing regularity, can measure the caloric impact temperature of the Ni-based marmem of titanium simple and convenient, exactly, and its job step is:
(1) cuts sample, adopt the liquid coolant cooling, be subjected to cutting diameter on the Ni-based marmem of titanium of thermal shock in martensite reverse transformation temperature range or width is 3～5mm, weigh the thin slice sample of 10～50mg;
(2) washed samples adopted the ultrasonic cleaning sample 10～20 minutes respectively in chemical pure alcohol, acetone, use deionized water again, adopted ultrasonic cleaning 10～20 minutes, dried standby then;
(3) measuring transformation curve, is 5～15 ℃/min with heating-cooling speed respectively with sample, puts into differential scanning calorimeter (DSC) and measures its transformation curve;
(4) measure the separation temperature, measure the separation temperature of phase transition process in the martensite reverse transformation curve;
(5) determine caloric impact temperature, the caloric impact temperature of TiNi marmem equals the separation temperature and deducts 3.2 ± 0.2 ℃; The caloric impact temperature of TiNiCu marmem equals the separation temperature and deducts 1.1 ± 0.2 ℃.
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|---|---|---|---|
| CNB2005100473985A CN100495003C (en) | 2005-10-14 | 2005-10-14 | Method for determining thermal impact temperature of Ti-Ni base shape memory alloy |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106404656A (en) * | 2016-09-18 | 2017-02-15 | 华南理工大学 | Method for determining stress-induced martensitic transformation critical point of shape memory alloy composite damping material |
| RU2810203C1 (en) * | 2023-05-05 | 2023-12-22 | Федеральное государственное автономное образовательное учреждение высшего образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" | Method for determining critical hardening temperature in titanium alloys |
-
2005
- 2005-10-14 CN CNB2005100473985A patent/CN100495003C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106404656A (en) * | 2016-09-18 | 2017-02-15 | 华南理工大学 | Method for determining stress-induced martensitic transformation critical point of shape memory alloy composite damping material |
| RU2810203C1 (en) * | 2023-05-05 | 2023-12-22 | Федеральное государственное автономное образовательное учреждение высшего образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" | Method for determining critical hardening temperature in titanium alloys |
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| CN100495003C (en) | 2009-06-03 |
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