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Method for in-situ preparation of copper-based shape memory alloy through additive manufacturing

A memory alloy, in-situ preparation technology, applied in additive manufacturing, additive processing, process efficiency improvement and other directions, can solve the problems of slow cooling speed, many gaps, poor mechanical properties, etc., to reduce the formation of pores and improve the weight. Melting zone, the effect of increasing the density

Inactive Publication Date: 2019-04-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The synthesis of copper-based shape memory alloys by powder metallurgy is a kind of in-situ synthesis. The biggest difficulty of the above synthesis methods is that it is difficult to accurately control the formation and reaction speed of each part of the reactants, and there are significant differences in the internal components of the alloy; at the same time, there are too many gaps. The alloy density is not high, and the mechanical properties are poor; in addition, the cooling rate is slow, and the brittle γ 2 Phase precipitation, adversely affecting material properties

Method used

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  • Method for in-situ preparation of copper-based shape memory alloy through additive manufacturing

Examples

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Embodiment 1

[0041] A method for preparing Cu-17Al-10Mn copper-based shape memory alloy of arbitrary shape through pre-alloyed powder, comprising the following steps:

[0042] (1) Put the high-purity alloy of elements Cu and Al in the alloy into a vacuum melting furnace for melting according to the mass ratio, and repeat the melting three times to obtain the original ingot, and pass the ingot into the vacuum melting furnace while melting at a high temperature The argon gas impacts the melt, and the melt is dispersed by the impact to form small droplets. After cooling, the required alloying powder raw material is formed. The particle size of the powder is 19.5-46.7 μm, and the average particle size is 30.5 μm. The high-purity alloy powder of Mn element is mechanically mixed with the above-mentioned pre-alloyed powder according to the mass ratio to obtain a uniform powder;

[0043] (2) The prepared mixed powder is used as the raw material, a continuous YAG laser is used as the energy source,...

Embodiment 2

[0048] A method for preparing Cu-17Al-10Mn copper-based shape memory alloy of arbitrary shape through pre-alloyed powder, comprising the following steps:

[0049] (1) Put the high-purity alloy of elements Cu and Mn in the alloy into a vacuum melting furnace according to the mass ratio for melting, repeat the melting three times to obtain the original ingot, and pass the ingot into the vacuum melting furnace while melting at high temperature The argon gas impacts the melt, and the melt is dispersed by the impact to form small droplets. After cooling, the required alloying powder raw material is formed. The particle size of the powder is 16.3-57.5 μm, and the average particle size is 31.2 μm. The high-purity alloy powder of Al element is mechanically mixed with the above-mentioned pre-alloyed powder according to the mass ratio to obtain a uniform powder;

[0050] (2) The prepared mixed powder is used as the raw material, a continuous YAG laser is used as the energy source, the l...

Embodiment 3

[0055] A method for preparing Cu-10.2Al-8.5Mn-0.3La copper-based shape memory alloy of arbitrary shape by pre-alloyed powder, comprising the following steps:

[0056] (1) Put the high-purity alloy of elements Cu and Al in the alloy into a vacuum melting furnace for melting according to the mass ratio, and repeat the melting three times to obtain the original ingot, and pass the ingot into the vacuum melting furnace while melting at a high temperature The argon gas impacts the melt, and the melt is dispersed by the impact to form small droplets. After cooling, the required alloying powder raw material is formed. The particle size of the powder is 8.63-50.2 μm, and the average particle size is 26.4 μm. The high-purity alloy powder of Mn and La elements is mechanically mixed with the above-mentioned pre-alloyed powder according to the mass ratio to obtain a uniform powder;

[0057] (2) Using the prepared mixed powder as the raw material, using high-energy electron beam as the ene...

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Abstract

The invention belongs to the field of preparation of copper-based shape memory alloys, and discloses a method for the in-situ preparation of any copper-based shape memory alloy through additive manufacturing. The method includes the following steps that (a) mixed powder needed by the element in a part is prepared and used as a raw material, and (b) the copper alloy is used as a forming substrate,electron beams or laser beams are used for conducting the selection melting technology to prepare the required copper-based memory alloy part, in the process, all the components in the mixed powder are instantly heated above melting points of the components and melted into a liquid phase without difference, the in-situ reaction diffusion is conducted under the liquid phase, the atomic reaction isfast, the diffusion time is short, and the composition segregation is avoided; and in addition, the parent phase formed by the main elements is not dissolved to form brittle gamma 2 phase but to formthe martensite phase, and the memory performance and hyperelasticity of the desired product are improved. By means of the method for the in-situ preparation of the copper-based shape memory alloy through the additive manufacturing, the product with any shape, high density, memory performance, super elasticity and high toughness are quickly prepared.

Description

technical field [0001] The invention belongs to the field of preparation of copper-based shape memory alloys, and more specifically relates to a method for in-situ preparation of arbitrary copper-based shape memory alloys by additive manufacturing. Background technique [0002] Copper-based shape memory alloys have good superelasticity, two-way memory properties, high damping properties, and low cost, so they are widely used in civil, industrial, military, aerospace, and machinery manufacturing fields. In particular, the phase transition temperature of copper-based shape memory alloy is relatively high, making it the preferred material for high-temperature applications (such as thermal actuators, thermal sensors), and the change of the composition of elements in the alloy is more sensitive to the influence of phase transition temperature. Therefore, the ratio of elements in the alloy can be adjusted to meet various temperature requirements in different application environmen...

Claims

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Application Information

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IPC IPC(8): B22F9/08B22F1/00B22F3/105C22C9/01B33Y10/00B33Y70/00
CPCB22F1/0003C22C9/01B22F3/23B22F9/082B33Y10/00B33Y70/00B22F2009/0848B22F2009/0824B22F10/00B22F10/34B22F10/28B22F10/36Y02P10/25
Inventor 魏青松党明珠朱文志田健滕庆史玉升
Owner HUAZHONG UNIV OF SCI & TECH
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