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Method of making ultrafine crystal deformed aluminium alloy

A technology of deforming aluminum alloy and ultra-fine grain, which is applied in the field of materials, can solve the problems of unsatisfactory effect and high cost of pulse current, and achieve the effect of refining grain, improving mechanical properties and increasing supercooling degree

Inactive Publication Date: 2010-04-07
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: the obtained grain size is about 0.3mm, the effect is not ideal, and the diameter of the sand mold is 40mm, the effect is unknown if a mold with a larger diameter is used, and the cost of applying pulse current is also very high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In the experiment, 6351 aluminum alloy was prepared with industrial pure Al and industrial pure Mg, Al-Si, Al-Mn master alloy. The alloy composition was 0.7-1.3% Si, 0.4-0.8% Mn, 0.4-0.8% Mg, and the balance was Al. First put pure aluminum into a crucible to melt and heat up to 800°C, and cover it with JZF-03 high-temperature covering agent; add alloy elements, add JZJ type harmless aluminum alloy refining agent for degassing and refining, remove scum, and then After standing at 730°C for 20 minutes, pour it into a water-cooled copper mold (Φ80mm×200mm), the water flow rate is 2.2ml / s, mechanical vibration is carried out during the solidification process, the vibration frequency is 50Hz, the excitation force is 100N, and 6351 is obtained after solidification Ingot. The alloy homogenization treatment process is: 463℃×24h to eliminate composition segregation. The hot extrusion process is as follows: the preheating temperature is 450° C., the extrusion speed is 1 m / min, a...

Embodiment 2

[0018] In the experiment, 2024 aluminum alloy was prepared with industrial pure Al and Al-Cu, Al-Si, Al-Mn master alloy. The alloy composition was 3.8-4.9% Cu, 0.3-0.9% Mn, 1.2-1.8% Mg, and the balance was Al. First put pure aluminum into a crucible to melt and heat up to 800°C, and cover it with JZF-03 high-temperature covering agent; add alloy elements, add JZJ type harmless aluminum alloy refining agent for degassing and refining, remove scum, and then After standing at 750°C for 20 minutes, pour it into a water-cooled copper mold (Φ80mm×200mm), the water flow rate is 2.2ml / s, mechanical vibration is performed during the solidification process, the vibration frequency is 45Hz, and the excitation force is 90N. After solidification, 2024 Ingot. The alloy homogenization treatment process is: 463℃×24h to eliminate composition segregation. The hot extrusion process is as follows: the preheating temperature is 450° C., the extrusion speed is 1 m / min, and the extrusion ratio is 3...

Embodiment 3

[0020] In the experiment, 7075 aluminum alloy was prepared with industrial pure Al and industrial pure Mg, Al-Cu, Al-Zn, Al-Cr master alloy. ~6.1% Zn, the balance is Al. First put pure aluminum into a crucible to melt and heat up to 800°C, and cover it with JZF-03 high-temperature covering agent; add alloy elements, add JZJ type harmless aluminum alloy refining agent for degassing and refining, remove scum, and then After standing at 750°C for 20 minutes, pour it into a water-cooled copper mold (Φ80mm×200mm), the water flow rate is 2.2ml / s, mechanical vibration is carried out during the solidification process, the vibration frequency is 40Hz, and the excitation force is 80N. Get 7075 ingot after solidification. The alloy homogenization treatment process is: 463℃×24h to eliminate composition segregation. The hot extrusion process is as follows: the preheating temperature is 450° C., the extrusion speed is 1 m / min, and the extrusion ratio is 30:1. The heat treatment process o...

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PUM

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Abstract

The invention discloses a making method of deforming aluminium alloy of hyperfine crystal in the material technical domain, which comprises the following steps: (1) adding pure industrial aluminium inthe copple; dissolving; heating; cladding aluminium through cladded; (2) adding Mg and middle alloy of Al-Si, Al-Mn, Al-Cu, Al-Zn and Al-Cr; adding refiner in the fuse to exhaust gas; removing floating slag; stewing; (3) fising cold copper mould of circulating water on the mechanic vibrating table; waiting to cast; (4) casting aluminium alloy in the cold copper mould of circulating water; supplying water before casting; (5) vibrating mechanically; (6) evening; squeezing; proceeding T6 heat disposal.

Description

technical field [0001] The invention relates to a method in the technical field of materials, in particular to a method for preparing ultrafine grain deformed aluminum alloys. Background technique [0002] Due to its light weight, rich resources, and good comprehensive performance, aluminum alloys are increasingly used in high-tech fields such as machinery, transportation, aerospace, and military industries. [0003] The rapid development of modern production technology requires materials with higher strength and toughness. Grain refinement not only improves the strength of the alloy, but also improves the plasticity and toughness of the alloy, which is an important way to improve the quality of aluminum materials. [0004] The methods of grain refinement can be summarized into four categories: one is to change the solidification conditions in the crystallization process; the other is to carry out plastic deformation and strictly control the subsequent recovery and recrysta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C1/06B22D21/04B22D27/04B22D27/08C22F1/04
Inventor 白亮陈东王浩伟马乃恒李险峰
Owner SHANGHAI JIAOTONG UNIV