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A kind of heat-resistant aluminum alloy powder and its preparation method and an aluminum alloy molded part and its preparation method

A technology for powder preparation and aluminum alloy, applied in the field of aluminum alloy, can solve the problems of single type of precipitation, increased brittleness of alloy, and unsatisfactory improvement of alloy performance.

Active Publication Date: 2022-07-19
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the problem of high-temperature softening of aluminum alloys has always restricted the development of structural design and service safety of parts in the medium-high temperature range.
[0003] At present, in order to improve the heat resistance of aluminum alloys, there are mainly two types. One is to add transition metal elements TM (TM=Ni, Fe, Cr, Mn, Co, Ce, etc.) A large amount of Al x tm y phase, but the type of precipitated phase is single, which leads to the unsatisfactory improvement of alloy properties. Although increasing the number of precipitated phases is beneficial to improve the high temperature performance of the alloy, when there are too many precipitated phases, it is easy to segregate and increase the brittleness of the alloy sharply; the other is Using Al-Fe-V-Si alloy, spherical α-Al can be formed in the alloy structure 12 (Fe,V) 3 The Si heat-resistant strengthening phase improves the heat resistance, but some high-temperature unstable second phases are formed in the alloy structure. When the temperature rises, these high-temperature unstable phases will aggregate, grow and polygonize, and even transform into Harmful phases, resulting in a significant decline in the mechanical properties of the alloy, making it difficult to meet the requirements of use

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  • A kind of heat-resistant aluminum alloy powder and its preparation method and an aluminum alloy molded part and its preparation method
  • A kind of heat-resistant aluminum alloy powder and its preparation method and an aluminum alloy molded part and its preparation method

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preparation example Construction

[0035] The present invention also provides a method for preparing the heat-resistant aluminum alloy powder according to the above technical solution, comprising the following steps:

[0036] (1) smelting pure aluminum, aluminum-zirconium master alloy, aluminum-scandium master alloy, aluminum-titanium master alloy, aluminum-nickel master alloy and aluminum-iron master alloy to obtain alloy melt;

[0037] (2) The alloy melt obtained in the step (1) is subjected to high pressure nitrogen atomization to obtain heat-resistant aluminum alloy powder.

[0038] In the present invention, pure aluminum, aluminum-zirconium intermediate alloy, aluminum-scandium intermediate alloy, aluminum-titanium intermediate alloy, gold-in-aluminum-nickel alloy and aluminum-iron intermediate alloy are smelted to obtain alloy melt.

[0039] In the present invention, the purity of the pure aluminum is preferably ≥99.99%; the aluminum-zirconium master alloy is preferably Al 90 Zr 10 ; Described aluminium s...

Embodiment 1

[0075] The chemical composition of the heat-resistant aluminum alloy powder is: Ni 7%, Fe 2%, Ti 0.7%, Sc0.5%, Zr 0.8% and Al 89%;

[0076] The preparation method of the heat-resistant aluminum alloy powder is as follows:

[0077] (1) After the crucible is preheated to 520°C, pure aluminum is placed in the crucible to melt, and the temperature is continued to rise to 1400°C. 90 Zr 10 , Al 85 Sc 15 , Al 80 Ti 20 The master alloy was added to the crucible and stirred for 30 min, then the melt temperature was lowered to 900 °C, and Al was added. 90 Ni 10 , Al 95 Fe 5 master alloy, and stir for 30min to obtain an alloy melt with uniform composition;

[0078] (2) open the valve at the bottom of the crucible, and the alloy melt obtained in the step (1) flows out through an alumina conduit with an inner diameter of 5 mm, falls freely, and the liquid flow is impacted and broken into fine droplets by a high-pressure nitrogen atomizer, and after solidification A heat-resistant...

Embodiment 2

[0080] The preparation steps of the aluminum alloy formed parts are as follows:

[0081] 1) The heat-resistant aluminum alloy powder prepared in Example 1 is subjected to selective laser melting and forming to obtain an aluminum alloy blank, and the specific steps are:

[0082] I. Use CAD to establish a three-dimensional model of an aluminum alloy forming part, and then convert it into cuttable data and import it into the selected area laser melting equipment to obtain multi-layer cross-sectional data;

[0083] II. According to the cross-sectional data of the first layer of the multi-layer cross-sectional data obtained in the step I, a metal powder layer with a thickness of 0.04 mm is laid on the substrate, and the geometric shape of the cross-section of the metal powder layer is scanned by laser 4 times to obtain the first solid state. layer; among them, the laser spot is 0.1mm, the laser power is 200W, the laser scanning rate is 1200mm / s, and the process is carried out under...

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Abstract

The invention provides a heat-resistant aluminum alloy powder and a preparation method thereof, an aluminum alloy molded part and a preparation method thereof, belonging to the technical field of aluminum alloys. The invention provides a heat-resistant aluminum alloy powder. The chemical composition in terms of mass percentage includes: Ni3-15%, Fe1.2-4%, Ti0.2-1%, Sc0.3-0.8%, Zr0.4- 3% and balance Al. In the present invention, Ni, Fe, Ti, Sc, Zr elements are added to the aluminum alloy, and these elements have large diffusion solid solubility, low equilibrium solid solubility and high temperature diffusion coefficient in the aluminum matrix, which can ensure that the alloy forms a large amount of Fibrous Al 3 Ni, Al 3 Ti, Al 3 (Sc, Zr) and granular Al 9 The FeNi nano-precipitation phase is synergistically reinforced by various morphological precipitation phases, and the mechanical properties of aluminum alloys at high temperature are improved by precipitation strengthening, grain refinement strengthening and fiber load transfer.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to a heat-resistant aluminum alloy powder and a preparation method thereof, and an aluminum alloy molded part and a preparation method thereof. Background technique [0002] The aerospace industry is the development focus of the national strategic industry. In order to save energy consumption and reduce transportation costs, lightweight components have always been an important goal pursued. Aluminum alloy materials are widely used in the aerospace field because of their advantages such as light weight, high strength, wear resistance and corrosion resistance. However, the problem of high temperature softening of aluminum alloys has always restricted the development of structural design and service safety of parts in the medium and high temperature range. [0003] At present, in order to improve the heat resistance of aluminum alloys, there are mainly two types. One is to add...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C1/03B22F9/08B22F10/28B22F10/64B33Y70/00B33Y10/00B33Y40/20
CPCC22C21/00C22C1/03C22C1/026B22F9/082B22F10/28B22F10/64B33Y70/00B33Y10/00B33Y40/20Y02P10/25
Inventor 毕江董国疆刘雷赵长财
Owner YANSHAN UNIV