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Preparation method for multi-scale precipitation of heterogeneous aluminum alloy bars

An aluminum alloy material and aluminum alloy technology, which is applied in the field of aging treatment to prepare multi-scale precipitated Al/7075Al heterogeneous bars, can solve the problems of low production efficiency and inability to prepare bars with heterogeneous structures, and achieve high production efficiency, The effect of simple operation process

Active Publication Date: 2018-05-08
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its limitations are (1) the plates used for rolling must be cut to the same size, and the preparation process needs to be cut, fixed, heated, and rolled many times, and the production efficiency is low; (2) this method is only applicable to Preparation of plates, bars with heterogeneous structures cannot be prepared

Method used

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  • Preparation method for multi-scale precipitation of heterogeneous aluminum alloy bars
  • Preparation method for multi-scale precipitation of heterogeneous aluminum alloy bars

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Select pure aluminum and 7075 aluminum alloy metal thin rods with a length of 1.2m, treat the surface, remove oil stains and oxide films, and polish until the bright metal is exposed.

[0028] (2) two kinds of thin metal rods processed according to figure 1 In the mixed arrangement shown, since the diameter of the mold used for the first pass is 20 mm, the cross-sectional diameter of the metal rod after mixing is about 20 mm to ensure that the metal blank can be inserted into the mold cavity. In order to prevent the thin metal rods from loosening, the ends of the blanks are bound and fixed with Al wires.

[0029] (3) Put the thin metal rod blank into the rotary forging machine for large deformation processing. The feeding speed is controlled at about 5m / min. When the cross-sectional diameter of the blank reaches the diameter of the next mold (18mm), replace the next mold and repeat the above operations , until a good bond is formed between the metals.

[0030] (4)...

Embodiment 2

[0033] (1) Select pure aluminum and 7075 aluminum alloy metal thin rods with a length of 1.2m, treat the surface, remove oil stains and oxide films, and polish until the bright metal is exposed.

[0034] (2) two kinds of thin metal rods processed according to figure 1 In the mixed arrangement shown, since the diameter of the mold used for the first pass is 20 mm, the cross-sectional diameter of the metal rod after mixing is about 20 mm to ensure that the metal blank can be inserted into the mold cavity. In order to prevent the thin metal rods from loosening, the ends of the blanks are bound and fixed with Al wires.

[0035] (3) Put the thin metal rod blank into the rotary forging machine for large deformation processing. The feeding speed is controlled at about 5m / min. When the cross-sectional diameter of the blank reaches the diameter of the next mold (18mm), replace the next mold and repeat the above operations , until a good bond is formed between the metals.

[0036] (4)...

Embodiment 3

[0039] (1) Select pure aluminum and 7075 aluminum alloy metal thin rods with a length of 1.2m, treat the surface, remove oil stains and oxide films, and polish until the bright metal is exposed.

[0040] (2) two kinds of thin metal rods processed according to figure 1In the mixed arrangement shown, since the first pass uses a mold diameter of 30mm, the cross-sectional diameter of the metal rod after mixing is about 30mm, ensuring that the metal blank can be inserted into the mold cavity. In order to prevent the thin metal rods from loosening, the ends of the blanks are bound and fixed with Al wires.

[0041] (3) Put the thin metal rod blank into the rotary forging machine for large deformation processing, and the feeding speed is controlled at about 5m / min. When the cross-sectional diameter of the blank reaches the diameter of the next mold (28mm), replace the next mold and repeat the above operations , until a good bond is formed between the metals.

[0042] (4) Take out th...

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Abstract

The invention provides a preparation method for multi-scale precipitation of heterogeneous aluminum alloy bars. According to the preparation method, a plurality of pure aluminum and 7075 aluminum alloy metal bars with the same length are mixed and bound, and then undergo rotating forging plastic deformation and multi-pass high-strain rotary forging deformation, so that the interfaces of initial aluminum alloy fine bars are combined to prepare pure aluminum and 7075 aluminum alloy mixed bar blanks, then multi-scale precipitation heat treatment on the bars is carried out by utilizing different age hardening behaviors of the pure aluminum and the 7075 aluminum alloy, and the heterogeneous Al and 7075 aluminum alloy bars with multi-scale precipitation phase density are finally obtained.

Description

technical field [0001] The present invention relates to a method for multi-scale precipitation of heterogeneous aluminum alloy rods, specifically a method for utilizing rotary forging deformation to achieve lateral close bonding of pure aluminum and 7075 aluminum alloy rods, and then preparing multi-scale precipitation of Al through aging treatment / 7075Al heterogeneous bar method. Background technique [0002] Aluminum has better characteristics than other non-ferrous metals and steel, such as low density, only 2.7g / cm 3 , about 1 / 3 of copper or steel; good corrosion resistance and weather resistance; good plasticity and processing properties. In addition, the high temperature performance, formability, machinability, riveting and surface treatment performance of aluminum are also relatively good. Therefore, aluminum has been widely used in various fields such as aerospace, navigation, aviation, automobiles, transportation, bridges, construction, electronics, energy and po...

Claims

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Application Information

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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 高波周浩李玉胜陈雪飞曹阳聂金凤赵永好李建生毛庆忠
Owner NANJING UNIV OF SCI & TECH
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