Preparation method of titanium alloy-nickel-titanium shape memory alloy biphase structure material
Through the multi-wire arc additive manufacturing process, the chemical composition of the melt pool is regulated, and the in-situ alloy molded titanium alloy-nickel-titanium shape memory alloy biphasic structural materials are solved, and the problems of deterioration of material interface performance and limited pore and gradient ranges existed in traditional processes are achieved, achieving continuous and uniform composition changes and good compression performance of the material.
Patent Information
- Application Number
- CN202311317718.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-12
- Publication Date
- 2025-04-15
AI Technical Summary
In the existing biphasic structural material preparation process, the thermal, physical and chemical properties of the material have large differences, resulting in deterioration of interface performance. The traditional process has problems of many pores and limited gradient range, which limits its application.
The multi-wire arc additive manufacturing process is adopted, and the relative wire feeding speed of the three wire materials, ER-Ni, TA1, and Ti-6Al-4V, and the melt pool chemical composition is regulated. In-situ alloy molded titanium alloy-nickel-titanium shape memory alloy biphasic structural material is designed to design a composition gradient of Ni element atomic fraction from 0 at.% to 50 at.%.
The continuous and uniform composition changes of the biphasic structural material of titanium alloy-nickel-titanium shape memory alloy are realized, which avoids cracks and improves the compression performance of the material.
Smart Images
Figure CN119820037A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of preparation of dual-phase structural materials, and specifically to a method for in-situ alloying and forming a titanium alloy-nickel-titanium shape memory alloy dual-phase structural material through an arc additive manufacturing process. Background Art
[0002] Ti-6Al-4V alloy has the advantages of low density, high specific strength and excellent mechanical properties. NiTi shape memory alloy, as a functional material, has good mechanical properties and also has unique shape memory effect and superelasticity. Therefore, the dual-phase structural materials obtained based on the excellent properties of Ti-6Al-4V alloy and NiTi shape memory alloy have great application potential in aerospace, energy engineering and other fields. However, the thermal, physical and chemical properties of the above two materials are quite different. Direct connection is prone to produce a large amount of intermetallic compounds such as Ti2Ni, resulting in deterioration of their interface properties or even cracking. The step-by-step transition connection method of functional gradient structure is conducive to reducing the possibility of cracks in the preparation process of dual-phase structural materials. However, gradient components produced by traditional methods such as powder metallurgy, vapor deposition, centrifugal casting, etc. have problems such as more pores and limited gradient range, which limits their application. Summary of the invention
[0003] In order to realize the preparation of titanium-nickel-based dual-phase structural materials, a method for in-situ alloying of titanium alloy-nickel-titanium shape memory alloy dual-phase structural materials through multi-wire arc additive manufacturing process is designed. A transition scheme with a Ni atomic fraction from 0at.% to 50at.% is designed by adopting a gradient material step-by-step transition connection method. In the process of multi-wire arc additive manufacturing, the chemical composition of the molten pool is regulated by adjusting the relative proportion of the metal wires fed into the molten pool, and the titanium alloy-nickel-titanium shape memory alloy dual-phase structural materials are formed by in-situ alloying.
[0004] The present invention is achieved through the following technical solutions:
[0005] A multi-wire arc additive manufacturing system was used to adjust the relative wire feeding speeds of the three wires ER-Ni, TA1, and Ti-6Al-4V to control the chemical composition of the molten pool, and in-situ alloying was performed to form a titanium alloy-nickel-titanium shape memory alloy dual-phase structural material. There are no obvious cracks in the macroscopic cross-sectional image of the molded component. The surface distribution energy spectrum analysis results along the construction direction of the sample show that the composition gradient design of the Ni element atomic fraction from 0at.% to 50at.% makes the chemical composition of the molded component show continuous and uniform changes. The titanium alloy-nickel-titanium shape memory alloy dual-phase structural material formed by the arc additive manufacturing process has good compression properties. BRIEF DESCRIPTION OF THE DRAWINGS
[0006] Figure 1Titanium alloy-nickel titanium shape memory alloy dual-phase structure material (a); macroscopic cross-section (b)
[0007] Figure 2 Element distribution along the building direction of titanium alloy-nickel titanium shape memory alloy dual-phase structural material
[0008] Figure 3 Stress-strain curve of titanium alloy-nickel-titanium shape memory alloy dual-phase structural material compression test DETAILED DESCRIPTION
[0009] Taking the multi-wire arc additive manufacturing of titanium alloy-nickel-titanium shape memory alloy dual-phase structural material as an example, the specific implementation scheme of the present invention is further explained in conjunction with the accompanying drawings:
[0010] (1) Preparation of dual-phase structural material samples: ER-Ni, TA1, Ti-6Al-4V metal wires were used as raw materials, Ti-6Al-4V alloy was used as substrate, and M-WAAM process was used to prepare titanium alloy-nickel-titanium shape memory alloy single-walled wall specimens. During the additive process, the current in the Ti-6Al-4V area was 120A, and a low current of 100A was used in the subsequent areas. The specific wire feeding speed was calculated based on the designed gradient scheme, combined with the chemical composition, diameter, density, etc. of the wire.
[0011] (2) Characterization of the organization and performance of dual-phase structural materials: The molded specimens are sampled according to different characterization methods, and grinding, polishing, corrosion and other processing procedures are carried out according to the experimental requirements.
[0012] I. Use a metallographic microscope to observe the macroscopic cross-section of the molded component;
[0013] II. Use an energy spectrometer to measure the chemical composition of the molded components along the construction direction;
[0014] III. Use a universal testing machine to test the compression properties of the molded components.
[0015] Figure 1 Shown are the actual picture and macroscopic cross-sectional view of the titanium alloy-nickel titanium shape memory alloy dual-phase structure material, and there are no obvious cracks on its surface. Figure 2 The figure shows the element distribution of the dual-phase structural material along the construction direction. The two main elements Ni and Ti in the transition region show a relatively good linear relationship along the deposition direction. The Ni atomic fraction gradually increases to 50at.%, and the Ti atomic fraction gradually decreases. The atomic fractions of Ni and Ti in the stable region are close to 1:1. The dual-phase structural material was subjected to compression testing, and its average compressive ultimate strength was 1253.85MPa, corresponding to a fracture strain of 12.16%. The composition of the titanium alloy-nickel-titanium shape memory alloy dual-phase structural material prepared by the multi-wire arc additive manufacturing process changes continuously and evenly, and the compression performance is good.
[0016] The present invention is described above by way of example. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be made by those skilled in the art without inventive effort falls within the protection scope of the present invention.
Claims
1. A method for preparing a titanium alloy-nickel-titanium shape memory alloy dual-phase structural material, characterized in that: The following steps are involved: (1) Using arc additive manufacturing technology, in-situ alloying is performed to form a titanium alloy-nickel-titanium shape memory alloy dual-phase structural material. (2) With respect to the arc additive manufacturing process in step 1, a multi-wire arc additive manufacturing system is used, and the relative wire feeding speeds of ER-Ni, TA1, and Ti-6Al-4V metal wires are changed simultaneously, thereby regulating the content of Ni and Ti elements in the molten pool, and in-situ alloying is performed to form a titanium alloy-nickel-titanium shape memory alloy dual-phase structural material. (3) For the titanium alloy-nickel-titanium shape memory alloy dual-phase structural material prepared in step 1, its chemical composition along the building direction achieves continuous, uniform and nearly linear changes.
2. A method for preparing a titanium alloy-nickel-titanium shape memory alloy dual-phase structural material, characterized in that: Titanium alloy-nickel-titanium shape memory alloy dual-phase structural material was prepared by multi-wire arc additive manufacturing process. As the atomic fraction of Ni element increased from 0at.% to 50at.%, the chemical composition of the dual-phase structural parts showed a uniform and continuous change, and had excellent compression performance.