Regulation and control method for ordered precipitation of precipitated phase of aluminum-lithium alloy in laser additive manufacturing

An aluminum-lithium alloy and laser additive technology, applied in the field of aluminum-lithium alloy, can solve the problems of dendrite coarsening, uneven element distribution, and affecting the comprehensive performance of Al-Li alloy

Active Publication Date: 2021-09-14
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Research by Jiao Shikun and others found that the Al-Li alloy manufactured by laser melting deposition technology is at the bottom of the plate, and the dendrites of the deposited Al-Li alloy are obviously coarsened, and copper-rich precipitation will appear in the interdendritic region, which affects the overall performance of the alloy.
Yang Qi and others found that the Al-Li alloy produced by general additive manufacturing will form columnar grains and uneven element distribution, and the phases in the Al-Li alloy will be distributed along the grain boundary and uneven, which will Affect the comprehensive performance of Al-Li alloy

Method used

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  • Regulation and control method for ordered precipitation of precipitated phase of aluminum-lithium alloy in laser additive manufacturing
  • Regulation and control method for ordered precipitation of precipitated phase of aluminum-lithium alloy in laser additive manufacturing
  • Regulation and control method for ordered precipitation of precipitated phase of aluminum-lithium alloy in laser additive manufacturing

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Experimental program
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Effect test

Embodiment 1

[0041] The rolling deformation is controlled at 3%. During the rolling process, dislocations are generated in the grain of the Al-Li alloy, and the θ' phase, T 1 During deformation and solid solution, phases precipitate at intragranular dislocations. Among them, θ' phase, T 1 The number of phases in the Al-Li alloy without rolling deformation increases to varying degrees, and the diameter of the θ' phase also decreases correspondingly with that of the Al-Li alloy without rolling deformation, T 1 Phase increase is greater than that of θ' phase. The schematic diagram of the structure distribution of Al-Li alloy is as follows: Figure 4 shown.

Embodiment 2

[0043] The rolling deformation is controlled at 5%, and the dislocations inside the Al-Li alloy grains will proliferate during the rolling process, and the θ' phase, T 1 The phase will continue to precipitate at the dislocation, so the θ'phase, T 1 Phase quantity and rolling deformation of 3% θ' phase, T 1 The number of phases increased to varying degrees, T 1 The phases are uniformly distributed, and the schematic diagram of the distribution of the Al-Li alloy is shown in Figure 5 shown.

Embodiment 3

[0045] When the rolling deformation is controlled to 7%, intragranular dislocations will further multiply, but due to the increase of deformation, a large number of intragranular dislocations are entangled, which hinders the proliferation of dislocations. Therefore, θ' phase, T 1 The number of phases increases at a slower rate, T 1 When the phase size and rolling deformation are 5% T 1 The grain size of the phase decreases and the distribution is uniform and dispersed. The schematic diagram of the structure distribution of its Al-Li alloy is shown in Figure 6 shown.

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Abstract

The invention provides a regulation and control method for ordered precipitation of a precipitated phase of aluminum-lithium alloy in laser additive manufacturing. The regulation and control method for ordered precipitation of the precipitated phase of aluminum-lithium alloy in laser additive manufacturing comprises the following steps of: feeding an aluminum-lithium alloy material into a molten pool for printing layer by layer to form a printing layer; performing rolling deformation on each formed printing layer during layer-by-layer printing, regulating and controlling the distribution of the precipitated phase by controlling the deformation amount, and then printing the next layer until printing forming of the whole aluminum-lithium alloy workpiece is completed, wherein the deformation amount of each printing layer is 7%-9% large deformation amount; and performing solid solution aging treatment on the printed and formed aluminum-lithium alloy workpiece. According to the invention, the metal material is controlled to be printed layer by layer, and synchronously, large-deformation-amount rolling deformation is carried out on each layer of the Al-Li alloy, so that ordered precipitation of the precipitated phase is controlled, and intragranular reinforced phases are not gathered at the grain boundary position and arranged disorderly any more; and a T1 phase and a [theta]' phase are precipitated at the intragranular dislocation position, the grain size of the T1 phase is reduced, grain refinement and uniform distribution are promoted, and the comprehensive performance is improved.

Description

technical field [0001] The invention relates to the technical field of aluminum-lithium alloys, in particular to a method for controlling the orderly precipitation of precipitated phases in aluminum-lithium alloy (Al-Li) manufactured by laser additive manufacturing. Background technique [0002] Additive manufacturing technology mainly uses laser beams, electron beams, plasma or ion beams as heat sources. In the process of additive manufacturing, according to the materials used, high-power laser beams are used to melt or rapidly solidify and grow layer by layer. Materials can be divided into Powder materials and wire materials. For the additive manufacturing technology of metal materials, it can be divided into laser deposition manufacturing with powder feeding as the technical feature and selective laser melting manufacturing with powder bed powder as the technical feature. [0003] Al-Li alloys have the characteristics of low density, high elastic modulus, excellent fract...

Claims

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Application Information

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IPC IPC(8): B22F3/105B22F10/28B22F10/66C22F1/057B33Y10/00
CPCB22F3/105B22F10/28B22F10/66C22F1/057B33Y10/00Y02P10/25
Inventor 孙中刚万桂林戴国庆郭艳华冯亮
Owner NANJING UNIV OF TECH
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