Method for regulating thermal expansion by stress regulation based on strain glass phase transformation

A stress regulation and glass phase technology, applied in the field of alloy materials, can solve the problems of accelerating material failure and shortening the life of components, and achieve the effects of high mechanical strength, avoidance of thermal stress, and high thermal conductivity

Inactive Publication Date: 2013-04-10
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the composite method can cause localized stresses that accelerate the failure of the material and ultimately shorten the life of the component

Method used

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  • Method for regulating thermal expansion by stress regulation based on strain glass phase transformation
  • Method for regulating thermal expansion by stress regulation based on strain glass phase transformation

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Experimental program
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Effect test

Embodiment 1

[0030] (1) The TiPd binary alloy is selected as the master alloy, which undergoes a B2 (parent phase)-B19 (martensitic phase) martensitic transformation during the cooling process, and is accompanied by the volume expansion of the alloy.

[0031] (2) Cr is selected as the doping alloy element to replace part of Pd in ​​the master alloy to form Cr-substituted Pd-type point defects. Alloys with different Cr contents are prepared by smelting and subjected to high-temperature solution treatment. Differential thermal scanning analysis and electrical resistance test show that with the increase of Cr content, the B2-B19 martensitic transformation temperature decreases sharply. When the Cr content exceeds its critical value (10%), the martensitic transformation is completely suppressed, and the alloy undergoes strain glass transformation.

[0032] (3) In situ transmission electron microscopy test during the cooling process showed that Ti 50 (Pd 39 Cr 11 ) part of the high-temperat...

Embodiment 2

[0035] (1) The TiPd binary alloy is selected as the master alloy, which undergoes a B2 (parent phase)-B19 (martensitic phase) martensitic transformation during the cooling process, and is accompanied by the volume expansion of the alloy.

[0036] (2) Cr is selected as the doping alloy element to replace part of Pd in ​​the master alloy to form Cr-substituted Pd-type point defects. Alloys with different Cr contents are prepared by smelting and subjected to high-temperature solution treatment. Differential thermal scanning analysis and electrical resistance test show that with the increase of Cr content, the B2-B19 martensitic transformation temperature decreases sharply. When the Cr content exceeds its critical value (10%), the martensitic transformation is completely suppressed, and the alloy undergoes strain glass transformation.

[0037] (3) In-situ transmission electron microscope test during cooling process shows that Ti 50 (Pd 39 Cr 11 ) part of the high-temperature p...

Embodiment 3

[0040] (1) The TiPd binary alloy is selected as the master alloy, which undergoes a B2 (parent phase)-B19 (martensitic phase) martensitic transformation during the cooling process, and is accompanied by the volume expansion of the alloy.

[0041] (2) Select Fe as the doping alloy element to replace part of Pd in ​​the master alloy to form Fe-substituted Pd-type point defects. Alloys with different Fe contents are prepared by smelting and subjected to high-temperature solution treatment. Differential thermal scanning analysis and electrical resistance test show that with the increase of Fe content, the B2-B19 martensitic transformation temperature decreases sharply. When the Fe content exceeds its critical value (15%), the martensitic transformation is completely suppressed and the alloy undergoes strain glass transformation.

[0042] (3) In-situ transmission electron microscope test during cooling process shows that Ti 50 (Pd 35 Fe 15 ) part of the high-temperature parent ...

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Abstract

The invention discloses a method for regulating thermal expansion by stress regulation based on strain glass phase transformation, and the method comprises the following steps of: first, selecting any alloy material having martensite phase transformation capable of causing volume expansion as mother alloy; second, performing defect doping in the mother alloy and then utilizing an in situ transmission electron microscopy to perform structure comparison and analysis on a high-temperature parent phase and low-temperature strain glass state so that the volume of similar-martensite divisions in the strain glass state is larger than that of the corresponding parent phase before phase transformation; and at last, applying different external forces to the strain glass alloy, and regulating the thermal expansion action of the strain glass alloy during temperature-rise period and temperature-fall period by changing the quantity and size of the similar-martensite divisions in the alloy. The method disclosed by the invention not only can artificially precisely regulate the thermal expansion action of the material at right time according to the actual needs to avoid thermal stress and thermal vibration that may be generated on precise devices but also can fully utilize the characteristics of the raw materials, such as performances of inherent high conductivity, high thermal conductivity and high mechanical strength of the alloy.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and relates to a method for regulating thermal expansion behavior by stress, in particular to a method for regulating thermal expansion behavior based on strain glass phase transition. Background technique [0002] Thermal expansion and contraction is a common phenomenon that exists widely in nature, and it is also an important problem faced by many fields such as machinery, electronics, and optics. Because the amplitude of the anharmonic vibration of atoms, ions, and molecules that make up the material will increase with the rise of temperature, most materials will expand in volume during the heating process. This phenomenon is known as positive thermal expansion. When a material is heated, its linear dimensions increase approximately proportional to the temperature. As the temperature changes, the length of the material changes by: [0003] ΔL=L 0 α(ΔT) [0004] where ΔT represents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D10/00C22F1/00
Inventor 孙军丁向东周玉美薛德祯任晓兵
Owner XI AN JIAOTONG UNIV
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