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Metal powder and preparation method thereof, and metal alloy and preparation method thereof

A metal powder and metal alloy technology, applied in the field of alloys, can solve the problems of high thermal cracking sensitivity of aluminum alloys, failure to meet the needs of use, and easy cracks, etc., to improve the laser absorption rate, promote the transformation to fine equiaxed crystals, The effect of reducing the probability of crack generation

Active Publication Date: 2021-11-05
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, 3D printing of aluminum alloys is mostly concentrated on Al-Si series, because Al-Si series aluminum alloys have better weldability, but Al-Si series alloys are medium and low-strength aluminum alloys, which cannot meet the needs of higher strength.
2-series (Al-Cu), 6-series (Al-Mg) and 7-series (Al-Zn) aluminum alloys have higher strength, but these aluminum alloys are highly sensitive to hot cracking and are prone to cracks during solidification

Method used

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  • Metal powder and preparation method thereof, and metal alloy and preparation method thereof
  • Metal powder and preparation method thereof, and metal alloy and preparation method thereof
  • Metal powder and preparation method thereof, and metal alloy and preparation method thereof

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preparation example Construction

[0042] In a second aspect, the embodiment of the present application provides a method for preparing the metal powder according to the embodiment of the first aspect, comprising: mixing aluminum alloy powder and niobium to obtain metal powder.

[0043] The particle size of niobium is ≤200nm. Nano-shaped niobium has a small size effect. In the process of mixing with aluminum alloy powder, the characteristics of large specific surface area and insufficient coordination of surface atoms make it under the action of van der Waals force. Spontaneously attaching to the surface of the aluminum alloy powder forms the metal powder of the embodiment of the present application.

[0044] In addition to aluminum, the aluminum alloy powder also contains other metal elements. The inventors of the present application have found that if aluminum micropowder, other metal element micropowders and Nb nanopowder are directly mixed and then melted, the composition of the metal alloy will easily be fo...

Embodiment 1

[0065] This embodiment provides a metal powder, which includes aluminum alloy powder and niobium on the surface of the aluminum alloy powder, the particle size of the aluminum alloy powder is 10-60 μm, the particle size of niobium is 20-200 nm, and the mass of niobium is 100 μm of the metal powder. 1.5% of mass. Among them, the aluminum alloy powder includes by weight percentage: Zn: 4.8wt%, Mg: 2.3wt%, Cu: 1.8wt%, Cr: 0.18wt%, impurity elements <0.15wt%, O≤0.05wt%, N≤ 0.05wt% and the rest of Al, impurity elements include Fe, Si, Mn and Ti.

[0066] This embodiment provides a method for preparing the above-mentioned metal powder, the preparation steps of which include:

[0067] (1) Melt Al, Zn, Mg and Cu metal blocks at 700°C, hold for 10 minutes, and cast them into 7-series Al-Zn-Mg-Cu alloy ingots, and control the content of Fe, Si, Mn and Ti to less than 0.15wt %, control the content of O and N to be lower than 0.03wt%.

[0068] (2) Melting the alloy ingot prepared in st...

Embodiment 2

[0075] This embodiment provides a metal powder, which includes aluminum alloy powder and niobium on the surface of the aluminum alloy powder. 2% of mass. Among them, the aluminum alloy powder includes by weight percentage: Zn: 5.1wt%, Mg: 2.1wt%, Cu: 1.9wt%, Cr: 0.18wt%, impurity elements <0.15wt%, O≤0.05wt%, N≤ 0.05wt% and the rest of Al, impurity elements include Fe, Si, Mn and Ti.

[0076] This embodiment provides a method for preparing the above-mentioned metal powder, the preparation steps of which include:

[0077] (1) Melt Al, Zn, Mg and Cu metal blocks at 700°C, hold for 10 minutes, and cast them into 7-series Al-Zn-Mg-Cu alloy ingots, and control the content of Fe, Si, Mn and Ti to less than 0.15wt %, control the content of O and N to be lower than 0.03wt%.

[0078] (2) Melting the alloy ingot prepared in step (1) to obtain alloy powder by gas atomization, and drying the alloy powder by using vacuum pneumatic sieve to obtain aluminum alloy powder with a particle si...

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Abstract

The invention discloses metal powder and a preparation method thereof, and metal alloy and a preparation method thereof, and belongs to the technical field of alloy. The metal powder comprises aluminum alloy powder and niobium on the surface of the aluminum alloy powder, the particle size of the aluminum alloy powder is micron-scale, the particle size of niobium is smaller than or equal to 200 nm, and the mass of niobium is 1-3% of that of the metal powder. The preparation method of the metal powder comprises the step of mixing the aluminum alloy powder with the niobium to obtain the metal powder. The preparation method of the metal alloy comprises the following steps of heating and melting the metal powder, and solidifying and forming to obtain the metal alloy. The crystal grains of the metal alloy are isometric crystals, and the size of the crystal grains is 1-5 microns. The metal alloy prepared from the metal powder is fine in grain, and the problem of crack generation can be solved.

Description

technical field [0001] The present application relates to the field of alloy technology, in particular, to a metal powder and a preparation method thereof, a metal alloy and a preparation method thereof. Background technique [0002] Additive manufacturing technology (commonly known as 3D printing) is a very attractive rapid prototyping technology, especially has great advantages in the preparation of complex structural parts, and is often used to manufacture metal parts with complex structures and excellent performance. At present, the 3D printing of aluminum alloys is mostly concentrated on Al-Si series, because Al-Si series aluminum alloys have better weldability, but Al-Si series alloys are medium and low-strength aluminum alloys, which cannot meet the needs of higher strength. 2-series (Al-Cu), 6-series (Al-Mg) and 7-series (Al-Zn) aluminum alloys have higher strength, but these aluminum alloys are highly sensitive to hot cracking and cracks are prone to occur during so...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F1/02B22F9/04B22F10/28B33Y10/00B33Y40/10B33Y70/00B33Y80/00C22C1/04C22C21/10
CPCB22F9/04B22F10/28B33Y70/00B33Y10/00B33Y40/10B33Y80/00C22C1/0416C22C21/10B22F2009/043Y02P10/25
Inventor 疏达肖飞祝国梁孙宝德
Owner SHANGHAI JIAO TONG UNIV
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