Preparation method of aluminum-based composite material

An aluminum-based composite material and composite material technology, applied in the field of material preparation, can solve the problems of low superplastic forming and processing, inability to put into industrial application, and increased material cost, and achieve excellent superplastic performance, high hardness, and crystal grain The effect of growth inhibition

Inactive Publication Date: 2019-07-12
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the thermomechanical processing method is complex, time-consuming and leads to an increase in material costs
More critically, the optimal superplastic deformation rate obtained by thermomechanical processing is too low for superplastic forming and processing to be put into industrial application

Method used

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  • Preparation method of aluminum-based composite material
  • Preparation method of aluminum-based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In situ self-generated 5wt.%TiB obtained by casting 2 / 7050Al composite material, the treatment method is as follows: (1) the particle reinforced aluminum matrix composite material obtained by in-situ autogenous casting is subjected to homogenization heat treatment of alloy elements, the heat treatment temperature is 475 ℃, and the heat treatment time is 20h; (2) the uniform The in-situ particle-reinforced aluminum-matrix composite material is subjected to one-way hot extrusion deformation; (3) The plate is subjected to friction stir treatment, and the particle-reinforced aluminum-matrix composite material plate to be processed is placed horizontally on the backing plate and fixed by clamping (4) Insert the stirring head into the surface of the plate at a speed of 600r / min until the lower end surface of the shoulder is in close contact with the upper surface of the plate, then stop the lowering and preheat the material; (5) make the stirring head 80mm / min The walking sp...

Embodiment 2

[0030] In situ self-generated 5wt.%TiB obtained by casting 2 / 7050Al composite material, the treatment method is as follows: (1) the particle reinforced aluminum matrix composite material obtained by in-situ autogenous casting is subjected to homogenization heat treatment of alloy elements, the heat treatment temperature is 475 ℃, and the heat treatment time is 20h; (2) the uniform The in-situ particle-reinforced aluminum-matrix composite material is subjected to one-way hot extrusion deformation; (3) The plate is subjected to friction stir treatment, and the particle-reinforced aluminum-matrix composite material plate to be processed is placed horizontally on the backing plate and fixed by clamping (4) Insert the stirring head into the surface of the plate at a speed of 800r / min until the lower end surface of the shoulder is in close contact with the upper surface of the plate, then stop the lowering and preheat the material; (5) make the stirring head 80mm / min The walking sp...

Embodiment 3

[0032] In situ self-generated 15wt.%TiB obtained by casting 2 / 7050Al composite material, the treatment method is as follows: (1) the particle reinforced aluminum matrix composite material obtained by in-situ autogenous casting is subjected to homogenization heat treatment of alloy elements, the heat treatment temperature is 485 ℃, and the heat treatment time is 24h; (2) the homogeneous The in-situ particle-reinforced aluminum-matrix composite material is subjected to one-way hot extrusion deformation; (3) The plate is subjected to friction stir treatment, and the particle-reinforced aluminum-matrix composite material plate to be processed is placed horizontally on the backing plate and fixed by clamping (4) Insert the stirring head into the surface of the plate at a speed of 1000r / min until the lower end surface of the shoulder is in close contact with the upper surface of the plate, then stop the lowering and preheat the material; (5) make the stirring head 50mm / min The walki...

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Abstract

The invention provides a preparation method of an aluminum-based composite material. The preparation method of the aluminum-based composite material comprises the following steps that a to-be-machinedaluminum-based composite material plate after being subjected to pretreatment is horizontally placed on a cushion plate and is clamped and fixed; a stirring head of friction stir welding is insertedinto the surface of the aluminum-based composite material plate at a rotating speed of 10-2000 rpm until the lower end of a shaft shoulder is in tight contact with the upper surface of the aluminum-based composite material plate, and the aluminum-based composite material plate is preheated; and transverse friction stir welding and longitudinal friction stir welding are carried out to the surface of the aluminum-based composite material plate through the stirring head at a certain walking speed until the whole aluminum-based composite material plate is machined completely. According to the preparation method of the aluminum-based composite material, the hardness of an in-situ nanoparticle reinforcing phase TiB2 added into an aluminum alloy is high, the heat stability is good, inhibiting effects on grain growth and void formation in high-temperature deformation of crystalline grains are achieved, and thus the material can have excellent superplasticity.

Description

technical field [0001] The invention relates to a method for preparing a material, in particular to a method for preparing a superplastic nanoparticle-reinforced aluminum-based composite material based on friction stir treatment. Background technique [0002] For engineering materials, it is very difficult to simultaneously improve strength and plasticity. In the field of lightweight aluminum alloys, microstructure modification can be carried out through strong plastic deformation techniques, such as friction stir processing, equal channel angular extrusion, etc., to obtain ultra-fine grains, thereby improving the strength of the material. However, compared with their coarse-grained structures, the fine-grained structures have low dislocation aggregation ability, resulting in a decrease in plasticity. One solution is to improve the ability of dislocation aggregation and resistance to dislocation slippage by introducing nanometer second-phase particles into the ultrafine-gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/053C22C32/00C22C21/10
CPCC22C21/10C22C32/0073C22F1/053
Inventor 鞠晓菲陈哲吴一汪明亮王浩伟钟圣怡
Owner SHANGHAI JIAO TONG UNIV
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