Method and product for preparing copper-based shape memory alloy with arbitrary shape in situ by laser

A memory alloy, arbitrary shape technology, applied in the field of copper-based shape memory alloy preparation, can solve the problems of low alloy density, slow cooling rate, poor mechanical properties, etc., achieve uniform and dense composition, reduce the formation of pores, improve Density effect

Active Publication Date: 2020-12-08
HUAZHONG UNIV OF SCI & TECH
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  • 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 and product for preparing copper-based shape memory alloy with arbitrary shape in situ by laser
  • Method and product for preparing copper-based shape memory alloy with arbitrary shape in situ by laser

Examples

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Embodiment 1

[0042] A method for directly preparing Cu-13.5Al-4Ni-0.5Ti copper-based shape memory alloy of arbitrary shape from alloyed powder, comprising the following steps:

[0043] (1) Put the high-purity alloy of each element (i.e. Cu, Al, Ni, Ti) in the alloy into the vacuum melting furnace according to the mass ratio for melting, and repeat the melting three times to obtain the original ingot, and place the ingot in the vacuum melting furnace While melting at medium and high temperature, argon gas is introduced to form an impact on the melt, and the melt is dispersed by the impact to form small droplets, and 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. ;

[0044] (2) The prepared alloyed powder is used as the raw material, and a continuous YAG laser is used as the energy source. The laser spot diameter is 80 μm. The scanning mode of the laser is to rotate 67° between lay...

Embodiment 2

[0049] A method for directly preparing Cu-25.5Zn-4Al-0.6Mn copper-based shape memory alloy of arbitrary shape from alloyed powder, comprising the following steps:

[0050] (1) Put the high-purity alloy of each element (i.e. Cu, Zn, Al, Mn) in the alloy into the vacuum melting furnace according to the mass ratio for melting, and repeat the melting three times to obtain the original ingot, and place the ingot in the vacuum melting furnace While melting at medium and high temperature, argon gas is introduced to form an impact on the melt, and the melt is dispersed by the impact to form small droplets, and the required alloying powder raw material is formed after cooling. The powder particle size is 13.6-71.5 μm, and the average particle size is 34.4 μm. ;

[0051] (2) The prepared alloyed powder is used as the raw material, and a continuous fiber laser is used as the energy source. The laser spot diameter is 60 μm. The scanning mode of the laser is to rotate 67° between layers, a...

Embodiment 3

[0056] A method for directly preparing Cu-13Al-4Ni-2Mn-0.5Ti copper-based shape memory alloy of arbitrary shape from alloyed powder, comprising the following steps:

[0057] (1) Put the high-purity alloy of each element (i.e. Cu, Al, Ni, Mn, Ti) in the alloy into a vacuum melting furnace according to the mass ratio for melting, and repeat the melting three times to obtain the original ingot, and place the ingot in a vacuum While melting at high temperature in the melting furnace, argon gas is introduced to form an impact on the melt. The melt is dispersed by the impact to form small droplets, and after cooling, the required alloying powder raw material is formed. The powder particle size is 7.94-49.3μm, and the average particle size 23.6μm;

[0058] (2) The prepared alloyed powder is used as the raw material, and a continuous fiber laser is used as the energy source. The laser spot diameter is 70 μm. The scanning mode of the laser is to rotate 67° between layers, and the brass...

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Abstract

The invention belongs to the field of preparation of copper-based shape-memory alloys, and specifically discloses a method and a product for in-situ preparation of copper-based shape-memory alloys with lasers in situ. After mixing, carry out vacuum melting to obtain ingots, and then use the aerosol method to make the ingots into powders with an average particle size of 20-50 μm, or add a reinforcement phase with a particle size of nanometers to the powder and mix them mechanically to prepare composite powders; In an inert gas protection environment with an oxygen content of less than 0.1%, the copper-based shape memory alloy of the desired shape is prepared by using the powder or composite powder as the powder raw material by using the laser selective melting additive manufacturing technology. The invention has the characteristics of short cycle, low cost, high flexibility and fast cooling rate, and can synthesize copper-based shape memory alloy with arbitrary shape, adjustable composition, no segregation and impurities, and excellent mechanical properties and memory properties.

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 and products for in-situ preparation of copper-based shape memory alloys of arbitrary shapes by laser. Background technique [0002] Copper-based shape memory alloys are widely used in civil, industrial, military, aerospace and machinery manufacturing fields due to their good superelasticity, two-way memory performance, high damping and low cost. In particular, its high phase transition temperature makes copper-based shape memory alloys the preferred materials for high-temperature applications (such as thermal actuators, thermal sensors), and its phase transition temperature is sensitive to changes in composition, so it can be adjusted by adjusting the alloy The ratio of elements can meet various temperature requirements in different application environments, and its good machinability provides feasibility for the manufacture...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105B22F9/08C22C1/04C22C1/05C22C1/10C22C9/01C22C9/04B33Y10/00B33Y80/00
CPCC22C1/0425C22C1/05C22C9/01C22C9/04B22F9/082B33Y10/00B33Y80/00B22F2009/0824B22F10/00B22F10/34B22F10/28B22F10/36Y02P10/25
Inventor 魏青松田健朱文志党明珠文世峰刘洁史玉升
Owner HUAZHONG UNIV OF SCI & TECH
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