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Heterogeneous aluminum-magnesium alloy bar and preparation method thereof

A technology of aluminum-magnesium alloy and magnesium alloy, which is applied in the field of heterogeneous aluminum-magnesium alloy rods and their preparation, can solve the problems of poor plastic deformation ability of magnesium, unrealized metallurgical bonding, and scrapped materials, so as to achieve low cost and avoid plastic deformation Insufficient ability to crack, good effect of dispersing force

Pending Publication Date: 2021-12-28
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In 2016, Sui Xin et al. published an article titled "Discussion on Obtaining Aluminum-magnesium Alloys by Swivel Technology" (Vol.36No.5 2016.5) in the journal "Ship Electric Technology". The magnesium alloy rod covered by swaging aluminum tube Aluminum / magnesium alloy composite rods were obtained, but good metallurgical bonding between aluminum and magnesium alloys was not achieved, and there were large gaps at the aluminum / magnesium interface in the composite rods obtained under experimental conditions
Moreover, in order to achieve a firm bond between the alloys, the total strain ε>2 applied during the swaging process, in the preparation of the aluminum / copper composite rod, each component deforms harmoniously, and the structural integrity is maintained, but in the aluminum / magnesium alloy composite rod In the preparation of rods, due to the poor plastic deformation ability of magnesium, cracks are generated inside the magnesium rods after the large deformation amount of swaging, which leads to the scrapping of materials

Method used

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  • Heterogeneous aluminum-magnesium alloy bar and preparation method thereof
  • Heterogeneous aluminum-magnesium alloy bar and preparation method thereof
  • Heterogeneous aluminum-magnesium alloy bar and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Step 1: Prepare 4 AZ31 magnesium alloy rods with a diameter of 4mm and a length of 65mm, polish off the outer layer of oxide skin, and insert the AZ31 magnesium alloy rods vertically into the groove at the bottom of the mold (the schematic diagram of the mold is shown in figure 1 As shown, the inner diameter is 20mm, the depth is 60mm, and there are 6 grooves at the bottom. The groove positions are as follows figure 2 As shown in (a), the diameter is 4mm, the depth is 5mm, and the distance between the center of the outer groove and the center of the mold is 6mm).

[0042] Step 2: Melt 0.5kg of industrial pure aluminum (AA1060) in a well-type resistance furnace. When the temperature reaches 680°C, keep it warm for 20 minutes and then pour it into the mold to fill the remaining part of the mold with the aluminum melt, and cool it to room temperature in air.

[0043]Step 3: Cut off the part of the magnesium alloy rod that is not covered by aluminum by wire cutting, and sw...

Embodiment 2

[0046] Step 1: Prepare 6 AZ31 magnesium alloy rods with a diameter of 8mm and a length of 210mm, polish off the outer layer of oxide skin, and insert the AZ31 magnesium alloy rods vertically into the groove at the bottom of the mold (the schematic diagram of the mold is shown in figure 1 As shown, the inner diameter is 40mm, the depth is 200mm, and there are 6 grooves at the bottom. The groove positions are as follows figure 2 As shown in (c), the diameter is 8mm, the depth is 10mm, and the distance between the center of the outer groove and the center of the mold is 12mm).

[0047] Step 2: Melt 1kg of industrial pure aluminum (AA1060) in a well-type resistance furnace. When the temperature reaches 700°C, keep it warm for 20 minutes and pour it into the mold to fill the spare part of the mold with the aluminum melt. Air-cool to room temperature.

[0048] Step 3: Cut off the part of the magnesium alloy rod that is not covered by aluminum by wire cutting, and swage the obtained...

Embodiment 3

[0051] Step 1: Prepare 8 AZ31 magnesium alloy rods with a diameter of 12mm and a length of 320mm, polish off the outer layer of oxide skin, and insert the AZ31 magnesium alloy rods vertically into the groove at the bottom of the mold (the schematic diagram of the mold is shown in figure 1 As shown, the inner diameter is 60mm, the depth is 300mm, and there are 8 grooves at the bottom. The groove positions are as follows figure 2 As shown in (e), the diameter is 12mm, the depth is 20mm, and the distance between the center of the outer groove and the center of the mold is 18mm).

[0052] Step 2: Melt 3kg of industrial pure aluminum (AA1060) in a well-type resistance furnace. When the temperature reaches 720°C, keep it warm for 20 minutes and then pour it into the mold to fill the spare part of the mold with the aluminum melt, and cool it to room temperature in air.

[0053] Step 3: Cut off the part of the magnesium alloy rod that is not covered by aluminum by wire cutting, and s...

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Abstract

The invention discloses a heterogeneous aluminum-magnesium alloy bar and a preparation method thereof. The preparation method comprises the following steps that (1) a plurality of magnesium alloy bars are uniformly inserted into a mold groove with a cylindrical cavity, (2) industrial pure aluminum is heated to 680-720 DEG C, then heat preservation is conducted for 15-30 min, the aluminum melt is poured into the cavity, the unoccupied part of the cavity is filled with the aluminum melt, air cooling is conducted until the room temperature, and a composite bar is obtained; (3) the as-cast composite bar is subjected to rotary swaging at the room temperature, rotary swaging is conducted for 10-30 passes, and the total strain of rotary swaging is smaller than 2; and (4) annealing is conducted. According to the heterogeneous aluminum-magnesium alloy bar and the preparation method thereof, metallurgical bonding of aluminum and magnesium is achieved through casting, small total strain can be selected in subsequent rotary swaging, and it is avoided that the magnesium alloy cracks due to insufficient plastic deformation capacity; and the ratio of aluminum to magnesium is adjustable, the thickness of an alloy layer on the surface of the magnesium alloy is adjustable, the multiple magnesium alloy bars and the aluminum form a net-shaped structure, so that in the deformation machining process, stress can be better dispersed, deformation can be better coordinated, and the machining capacity of the composite bar is improved.

Description

technical field [0001] The invention belongs to the field of metal-based composite materials, and in particular relates to a heterogeneous aluminum-magnesium alloy rod and a preparation method thereof. Background technique [0002] With the continuous progress of modern industrial technology and the continuous improvement of people's requirements for product quality, materials composed of a single component can no longer meet the needs of industrial development and people's lives, and composite materials have emerged as the times require. The metal matrix composite material is a new type of composite material that uses a specific, certain quantitative ratio of multiple components, through artificial compounding, to achieve a firm metallurgical bond between the phases and to observe a clear interface. Metal matrix composites combine the excellent properties of multiple materials, and to a certain extent, improve many performance deficiencies of single metal materials. [000...

Claims

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Application Information

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IPC IPC(8): B21J1/00B21J5/06C22F1/04C22F1/06
CPCB21J1/00B21J5/06C22F1/04C22F1/06
Inventor 聂金凤孙新达赵永好李玉胜周浩曹阳
Owner NANJING UNIV OF SCI & TECH
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