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Multi-grain-size 7-series aluminum alloy composite material and preparation method thereof

A technology for composite materials and aluminum alloys, which is applied in the field of multi-grain-scale 7-series aluminum alloy composite materials and its preparation, can solve the problems of general anti-fading effect of refiners, cumbersome and complicated preparation procedures, and serious plastic loss, etc. Good chemical effect, wide applicability, and the effect of improving surface wear resistance

Active Publication Date: 2022-04-12
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material has the following disadvantages: although the strength is greatly improved, the plastic loss is also serious, the anti-decay effect of the refiner is average, and the preparation process is cumbersome and complicated, and the manufacturing cycle is long

Method used

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  • Multi-grain-size 7-series aluminum alloy composite material and preparation method thereof
  • Multi-grain-size 7-series aluminum alloy composite material and preparation method thereof
  • Multi-grain-size 7-series aluminum alloy composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Step (1): Prepare bar raw materials: aluminum ingot with purity ≥99.7%, 5.5wt.% zinc powder, 1.5wt.% magnesium powder, 0.1wt.% chromium powder of 50-100 μm, (for the preparation of Al-5.5Zn - 1.5Mg-0.1Cr aluminum alloy matrix material) 0.1wt.% and 1wt.% Al-TiC (B) seed alloy rod two small pieces, silicon block with purity ≥ 99.7%.

[0043] Step (2): Prepare the inner layer and the outer layer casting mold: the inner diameter of the inner layer mold is 10mm, and the length is 0.11m. The outer mold is a hollow ring with a length of 0.1m. The outer diameter of the solid part of the ring is 10mm, and the inner diameter of the outer hollow part is 13mm.

[0044] Step (3): Prepare rods: Mix all kinds of powders evenly. Put the aluminum ingot into the vacuum melting furnace, raise the temperature to 720°C in 70 minutes, and keep it warm for one hour. After taking out the molten aluminum and stirring evenly, add the weighed 5.5wt.% zinc powder, 1.5wt.% magnesium powder, 0.1w...

Embodiment 2

[0049] Step (1): Prepare bar raw materials: aluminum ingot with purity ≥ 99.7%, 3wt.% zinc powder, 3wt.% magnesium powder, 5wt.% silicon block (for preparing Al-3Zn-3Mg-5Si aluminum Alloy base material), 0.1wt.% and 1.5wt% Al-TiC (B) seed alloy bar two small sections, purity ≥ 99.7% silicon block.

[0050] Step (2): Prepare a plate casting mold: length 0.2m, width 0.2m, thickness 10mm.

[0051] Step (3): Preparation of plates: Mix all kinds of powders evenly. Put the aluminum ingot into the vacuum melting furnace, raise the temperature to 720°C in 70 minutes, and keep it warm for one hour. After taking out molten aluminum and stirring evenly, add weighed 3wt.% zinc powder, 3wt.% magnesium powder, 5wt.% silicon block, 0.1wt.% Al-TiC(B) seed alloy rod. Stir evenly, put it into the melting furnace and keep it warm for 30 minutes. After the mold is preheated to 200-300°C, pour it into the mold for preparing plate-shaped materials, take it out after water cooling, and clean the s...

Embodiment 3

[0055] Step (1): Prepare rod raw materials: 7005 aluminum alloy, 0.1wt.%, 0.4wt% and 2wt% Al-TiC(B) seed crystal alloy rods in three sections.

[0056] Step (2): Prepare the casting mold for the inner layer, the middle layer and the outer layer: the inner diameter of the inner layer mold is 30mm, and the length is 0.5m. The middle layer mold is used to cast the middle layer hollow round tube, the length is 0.49m, the inner diameter of the round tube is 30mm, and the outer diameter is 40mm. The outer layer mold is used to cast the outer layer hollow round tube, the length is 0.48m, the inner diameter of the round tube is 40mm, and the outer diameter is 50mm.

[0057] Step (3): Prepare rods: put the 7005 aluminum alloy into a vacuum melting furnace, raise the temperature to 720° C. in 70 minutes, and keep the temperature for one hour. After taking out molten aluminum and stirring evenly, 0.1wt.% Al-TiC(B) seed crystal alloy rod. Stir evenly, put it into a smelting furnace and ...

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Abstract

The invention belongs to the field of composite materials, and particularly relates to a multi-grain-size 7-series aluminum alloy composite material and a preparation method thereof. And the multi-grain-size composite material is obtained by regulating and controlling the proportion of the refiner. Comprising the following steps that (1) a core bar and an outer-layer circular ring with different TCB seed crystal alloy refiner contents are generated through smelting and pouring, and the content of the outer-layer circular ring refiner is larger than the content of the core bar refiner; (2) extruding the core bar into the outer-layer circular ring at 400-500 DEG C under the protection of inert gas; and (3) rotary swaging. The preparation method is simple, the production period is short, and batch production is easy to realize; the added Al-TiC (B) seed crystal alloy refiner is good in anti-poisoning and anti-recession effects, the stress corrosion resistance of the aluminum alloy can be effectively improved by adding Si, Cr, Zr and other elements, the strength and toughness of the material can be synchronously improved by adjusting and controlling the proportion of the refiner to obtain the multi-grain size, and the Al-TiC (B) seed crystal alloy refiner has wide application prospects in the aerospace field.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a multi-grain-scale 7-series aluminum alloy composite material and a preparation method thereof. Background technique [0002] As a lightweight metal material with excellent performance, aluminum alloy has high tensile strength, good toughness and corrosion resistance, and good fatigue resistance. It is considered to be an ideal structural material in the development of aerospace industry. High-strength and tough aluminum alloys represented by 7XXX have greatly improved the combat capabilities and technical indicators of new fighter jets, launch vehicles, and long-range missiles. Therefore, it is of great significance to study the preparation technology of high-strength and tough aluminum alloys for the development and application of 7XXX aluminum alloys. However, the 7XXX aluminum alloy is casted in the traditional casting process, and after simple thermoplastic d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/03C22F1/053B21C37/04
CPCY02P10/20
Inventor 聂金凤陈旻佳伍玉立范勇赵永好李玉胜周浩曹阳
Owner NANJING UNIV OF SCI & TECH
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