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Memory alloy based nano laminated composite material and preparation method thereof

A memory alloy and nano-layered technology, which is applied in the field of composite materials with memory function and its preparation, can solve the problems of dislocation movement hindrance, strength and toughness opposition, etc.

Inactive Publication Date: 2019-05-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the strain matching between the nano-reinforced phase and the NiTi memory alloy matrix, as well as the hindrance of dislocation movement by a large number of grain boundaries and heterogeneous interfaces, it is expected to achieve high strength, high toughness and bulk morphology in one material at the same time. Elements required for engineering structural materials, solving the long-standing conflict between strength and toughness in metallic materials

Method used

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  • Memory alloy based nano laminated composite material and preparation method thereof
  • Memory alloy based nano laminated composite material and preparation method thereof
  • Memory alloy based nano laminated composite material and preparation method thereof

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Embodiment 1

[0050] In this embodiment, specifically, Nb is used as the reinforcing phase and NiTi shape memory alloy is used as the matrix. The specific NiTi shape memory alloy is a NiTi alloy with a Ni content of 50.1 at%. The NiTi shape memory alloy and the reinforcing phase metal Alternately arranged in sheets and layers to form a layered composite material, thereby forming a Nb-NiTi nano-layered composite material.

[0051] See attached figure 2 , Figure a is a cross-sectional scanning electron microscope picture of a Nb-NiTi nanolayer composite material with a Nb sheet thickness of about 10 μm after the first two passes, and Figure b is a Nb-NiTi nanometer composite material with a Nb sheet thickness of about 60 nm. High Angle Annular Dark Field (HAADF) picture of the cross-sectional transmission electron microscope of the layered composite material. It can be seen that the Nb reinforcement phase and the NiTi alloy matrix phase are alternately distributed in sheets, and the Nb phase...

Embodiment 2

[0069] For Cu-NiTi memory alloy-based nano-layered composites, due to the low melting points of Cu and Ni, it is necessary to appropriately reduce the processing temperature in step (6) to about 700 °C. At this time, the plasticity of NiTi will decrease, so it is necessary to At the same time, the amount of deformation in a single pass is appropriately reduced, for example, the amount of deformation in a single pass is not higher than 50%, that is, the range of deformation in a single pass is 40-50%, preferably 45%.

[0070] Materials obtained in this embodiment are shown in Figure 5 In a, the thickness of the reinforcing phase Cu layer is about 7 μm, and the volume fraction of the reinforcing phase is 35%. Repeating steps (2) to (7) can further obtain a material with a reinforcing phase of nanoscale thickness.

Embodiment 3

[0072] For the Ta-NiTi memory alloy-based nano-layered composite material, the physical properties and mechanical properties of Ta are close to those of Nb, so the specific implementation method of preparing Ta-NiTi is the same as the above-mentioned preparation method of Nb-NiTi.

[0073] Materials obtained in this embodiment are shown in Figure 5 In b, the thickness of the reinforcing phase tantalum layer is about 11.5 μm, and the volume fraction of the reinforcing phase is 48%. Repeating steps (2) to (7) can further obtain a material with a reinforcing phase of nanoscale thickness.

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Abstract

The invention provides a memory alloy based nano laminated composite material and a preparation method thereof. According to the memory alloy based nano laminated composite material, X metal with thevolume fraction of 20-80% is used as a reinforced phase, and a NiTi shape memory alloy is used as a base body. Metal of the NiTi shape memory alloy and the reinforced phase is arranegd alternately ina laminated mode, the laminated composite material is formed, the laminated thickness of the reinforced phase reaches a micro-nano dimension, and the X metal is one of Nb, Cu, Ta, Ni, Mo and W. According to the memory alloy based nano laminated composite material and the preparation method thereof, a nano laminated composite material mode is adopted, the NiTi shape memory alloy is used as the basebody, and the memory alloy base nano laminated composite material is prepared. Due to large elastic strain of the nano reinforced phase and the NiTi shape memory alloy base body and the fact that thenano laminated material has a lot of advantages such as being capable of realizing a large block mode, the memory alloy based nano laminated composite material is expected to controllably achieve high strength and high tenacity in large block materials.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a composite material with memory function and its preparation. Background technique [0002] The development of materials with excellent mechanical properties such as high strength, high toughness and large elastic strain has always been one of the goals pursued by researchers. Traditional metal material strengthening methods include solid solution strengthening, dispersion strengthening, fine grain strengthening and dislocation strengthening, etc. The essence of these strengthening methods is to continuously increase the number of lattice defects such as dislocations in the material or continuously reduce the size of the microstructure The yield strength of the material is improved. While these traditional metal strengthening methods increase the strength, the toughness of the material is greatly reduced, that is, the phenomenon of imbalance of strength and toughness ...

Claims

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Application Information

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IPC IPC(8): C22F1/18C22F1/10B21C37/02
Inventor 毛圣成蔡吉祥韩晓东张泽
Owner BEIJING UNIV OF TECH
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