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4D forming method for nickel-titanium alloy member with deformation recovery rapid response and product

A nickel-titanium alloy, fast-response technology, applied in the direction of additive manufacturing, additive processing, etc., can solve the problems affecting the shape memory effect and superelasticity of formed parts, the change of phase transition temperature and phase transition interval, and the lack of versatility of nickel-titanium alloy and other problems, to avoid large phase transition temperature changes, increase the surface area, and avoid uncontrollable changes

Active Publication Date: 2021-03-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the forming process of nickel-titanium alloy, due to the influence of chemical composition, residual stress and impurity absorption and other factors, it is easy to cause changes in the phase transition temperature and phase transition interval, which in turn affects the shape memory effect and superelasticity of the formed part.
Therefore, previous studies have focused on optimizing process parameters to improve the formation of hot cracks and pores in NiTi alloys, but this will reduce the adjustable range of phase transition temperature, and the optimal process parameters are not universal for NiTi alloys with different compositions. Some studies focus on analyzing the impact of macroscopic defects or dislocations on functional performance through microstructure, but no clear method to enhance the shape memory effect and achieve large deformation

Method used

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  • 4D forming method for nickel-titanium alloy member with deformation recovery rapid response and product
  • 4D forming method for nickel-titanium alloy member with deformation recovery rapid response and product
  • 4D forming method for nickel-titanium alloy member with deformation recovery rapid response and product

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) According to the support strength and response speed of deformation recovery required by the 4D printed nickel-titanium alloy fast-response functional components in the application of metal bone implants, the unit cell configuration of the three-period minimal curved surface and the corresponding Relative density, the unit cell configuration used in this example is Gyroid structure, which spirals periodically in three directions, has good support strength, and the super large specific surface area is also more conducive to the recovery of deformation. This structure is also passed through The array method forms two lattice structures S with different relative densities A and the lattice structure S B , the lattice structure is designed as a cube with a side length of 20 mm, and the lattice structure S A The relative density is 10%, the lattice structure S B The relative density is 5%.

[0043] (2) Boolean operations are performed on two lattice structures with di...

Embodiment 2

[0047] (1) According to the support strength and response speed of deformation recovery required by the 4D printed nickel-titanium alloy fast-response functional components in the application of metal bone implants, the unit cell configuration of the three-period minimal curved surface and the corresponding Relative density, the unit cell configuration used in this example is Gyroid structure, which spirals periodically in three directions, has good support strength, and the super large specific surface area is also more conducive to the recovery of deformation. This structure is also passed through The array method forms two lattice structures S with different relative densities A and the lattice structure S B , the lattice structure is designed as a cube with a side length of 20 mm, and the lattice structure S A The relative density is 10%, the lattice structure S B The relative density is 5%.

[0048] (2) Boolean operations are performed on two lattice structures with di...

Embodiment 3

[0052] (1) According to the support strength and response speed of deformation recovery required by the 4D printed nickel-titanium alloy fast-response functional components in the application of metal bone implants, the unit cell configuration of the three-period minimal curved surface and the corresponding Relative density, the unit cell configuration used in this example is Gyroid structure, which spirals periodically in three directions, has good support strength, and the super large specific surface area is also more conducive to the recovery of deformation. This structure is also passed through The array method forms two lattice structures S with different relative densities A and the lattice structure S B , the lattice structure is designed as a cube with a side length of 20 mm, and the lattice structure S A The relative density is 50%, the lattice structure S B The relative density is 40%.

[0053] (2) Boolean operations are performed on two lattice structures with d...

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Abstract

The invention belongs to the related technical field of metal additive manufacturing, and discloses a 4D forming method of a nickel-titanium alloy member with deformation recovery rapid response and aproduct. The 4D forming method of the nickel-titanium alloy member with deformation recovery rapid response comprises the following steps of S1, determining the deformation amount and deformation recovery speed requirements of the to-be-formed member, constructing a lattice structure SA and a lattice structure SB with different relative densities by adopting a three-period minimal curved surface,and performing Boolean differencing operation on the lattice structure SA and the lattice structure SB to remove the same parts in the lattice structures so as to obtain a shell lattice structure; S2, adjusting the parameters of the lattice structures SA and SB till the deformation amount and deformation recovery speed requirements of the to-be-formed member are met, and a three-dimensional modelis obtained; and S3, forming the three-dimensional model through selective laser melting so as to obtain the needed to-be-formed member. By means of the 4D forming method of the nickel-titanium alloymember with deformation recovery rapid response, the forming quality of the nickel-titanium alloy is effectively controlled, and the response speed of large deformation and deformation recovery of the obtained product is increased.

Description

technical field [0001] The invention belongs to the technical field related to metal additive manufacturing, and more specifically, relates to a 4D forming method and product of a nickel-titanium alloy component with rapid response to deformation recovery. Background technique [0002] Additive manufacturing technology is an advanced manufacturing technology developed by the interdisciplinary integration of new material technology, manufacturing technology, and information technology. It is based on the CAD model of components, and can realize the forming of any complex structure through the principle of layer-by-layer forming and superposition. 4D printing is based on additive manufacturing, using smart materials or smart components, under the action of specific external physical fields, to make the shape, performance and function of the sample achieve predetermined controllable changes over time or space. In the present invention, the forming method used is laser selective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F10/28B22F10/34B33Y10/00B33Y50/02
CPCB33Y10/00B33Y50/02
Inventor 宋波魏帅帅范军翔史玉升
Owner HUAZHONG UNIV OF SCI & TECH
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