A method to improve the superelasticity of β titanium alloy

A beta titanium alloy, superelastic technology, applied in the field of nanomaterial preparation, can solve the problem of insignificant superelastic behavior, and achieve the effect of reducing the pinning effect, delaying the opening time of dislocations, and reducing the opening of dislocations

Active Publication Date: 2021-09-10
XIAN UNIV OF TECH
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Problems solved by technology

Therefore, there is a certain shape memory effect in macroscopic bulk β-titanium alloys, but the superelastic behavior is not obvious, especially for Ti-Mo-based and Ti-V-based β-titanium alloys, whose superelasticity is less than 0.3%

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  • A method to improve the superelasticity of β titanium alloy
  • A method to improve the superelasticity of β titanium alloy
  • A method to improve the superelasticity of β titanium alloy

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Embodiment

[0039] Taking the Ti-10V-2Fe-3Al alloy as an example, for other β-titanium alloys with shape memory, the purpose of reducing size and improving superelasticity can be achieved by selecting the orientation of martensitic phase transformation and adjusting the sample size range through calculation.

[0040] Step 1. Calculate the phase transformation strain generated when the Ti-10V-2Fe-3Al alloy is transformed from the downward β phase to martensite at different positions, and select the orientation grains that are beneficial to the martensitic transformation;

[0041] Specifically: for the Ti-10V-2Fe-3Al alloy, the β phase undergoes transformation to the α″ martensite phase under the action of an external force. The β phase maintains an orientation relationship with the α″ martensite:[100] α″ / / [100] β , [010] α″ / / [101] β and [001] α″ / / [110] β , the martensitic transformation is along three principal axes ([100] α″ , [010] α″ and [001] α″ ) will produce η 1 =-7.1%, η...

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Abstract

The invention discloses a method for improving the superelasticity of β-titanium alloy, which includes: selecting a bulk β-titanium alloy with shape memory effect as a sample, and determining the martensitic phase transformation favorable amount according to the martensitic phase transformation strain amount of the sample. Orientation; electropolishing the sample; marking the surface of the treated sample; testing and analyzing the treated sample to obtain the grain orientation distribution map of the sample; The trace mark and the grain orientation distribution map of the sample can be used to determine the position of the grain that is conducive to the martensitic transformation; the inside of the grain that is conducive to the martensitic transformation is processed to obtain a micron-sized cylindrical sample. The size of the sample decreases, the size of the martensite decreases, and the martensite is difficult to form and easy to reverse phase transformation, resulting in superelasticity. At the same time, the size of the sample is reduced, the strength of the material is improved, the opening time of the dislocation is delayed, and the pinning effect of the dislocation on the reverse martensitic transformation is reduced, thereby improving the superelasticity of the β-titanium alloy.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of nanometer materials, and relates to a method for improving the superelasticity of beta titanium alloy. Background technique [0002] With the development of micro-nano devices, shape memory alloys can be used not only as sensors but also as actuators due to their unique superelasticity, which stimulates people's research on small-scale intelligent metal materials with superelastic behavior. Compared with traditional Ti-Ni, Cu-Al-Ni shape memory alloys, titanium-based shape memory alloys also have excellent strength and toughness, good corrosion resistance and biocompatibility. Martensitic transformation is the main load-bearing deformation mode of superelasticity, and the martensitic transformation in titanium alloy mainly occurs in Beta (β) titanium alloy. Under the action of external force, the β-phase matrix of β-titanium alloy can undergo transformation to α″ phase martensite p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
CPCC22F1/183
Inventor 潘艳丁向东孙巧艳肖林
Owner XIAN UNIV OF TECH
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