Method using nanocrystalline to refine aluminum alloy and improve strength and toughness

A technology for refining aluminum and improving toughness, which is applied in the field of using nanocrystals to refine aluminum alloys and improve strength and toughness. It can solve the problems of high cost of containing rare earths and insignificant refinement effect of Al-Si alloy, so as to promote the application range, huge industrial application potential and value, and the effect of improving room temperature toughness

Inactive Publication Date: 2018-04-13
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other modifiers or inoculants such as: Al-Sr, Al-Ce, Al-La, etc. contain rare earths, the cost is high, and the effect on the refinement of Al-Si alloy structure is not significant

Method used

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  • Method using nanocrystalline to refine aluminum alloy and improve strength and toughness
  • Method using nanocrystalline to refine aluminum alloy and improve strength and toughness
  • Method using nanocrystalline to refine aluminum alloy and improve strength and toughness

Examples

Experimental program
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Effect test

Embodiment 1

[0048] In this embodiment, the method for refining the aluminum alloy by using nanocrystals and improving the strength and toughness includes the following steps:

[0049] (1) Preparation of multi-element metal glass alloy ingot:

[0050] (1a) Polish the oxide film on the surface of Ni, Nb and Ti, and then press Ni 60 Nb 25 Ti 10 The atomic percentage ratio is prepared and placed in a beaker filled with absolute alcohol to prevent its oxidation;

[0051] (1b) Stack Ni, Nb and Ti prepared in order according to the melting point from low to high in the water-cooled copper mold crucible;

[0052] (1c) Cover the furnace cover and vacuumize twice before the formal smelting, each time the vacuum reaches 6.0×10 -3 Pa and filled with high-purity Ar gas to dilute residual oxygen;

[0053] (1d) After twice vacuuming, charge high-purity Ar gas of 0.05MPa atmospheric pressure to dilute residual oxygen in the furnace;

[0054] (1e) Turn on the magnetic stirring to smelt the alloy, tu...

Embodiment 2

[0081] The method for refining aluminum alloy and improving strength and toughness by using nanocrystals in this embodiment includes the following steps:

[0082] (1) Preparation of multi-element metal glass alloy ingot:

[0083] (1a) Polish the oxide film on the surface of Ni, Nb and Ti, and then press Ni 60 Nb 25 Ti 10 The atomic percentage ratio is prepared and placed in a beaker filled with absolute alcohol to prevent its oxidation;

[0084] (1b) Stack Ni, Nb and Ti prepared in order according to the melting point from low to high in the water-cooled copper mold crucible;

[0085] (1c) Cover the furnace cover and vacuumize twice before the formal smelting, each time the vacuum reaches 6.0×10 -3 Pa and filled with high-purity Ar gas to dilute residual oxygen;

[0086] (1d) After twice vacuuming, charge high-purity Ar gas of 0.06MPa atmospheric pressure to dilute residual oxygen in the furnace;

[0087] (1e) Turn on the magnetic stirring to smelt the alloy, turn over t...

Embodiment 3

[0114] The method for refining aluminum alloy and improving strength and toughness by using nanocrystals in this embodiment includes the following steps:

[0115] (1) Preparation of multi-element metal glass alloy ingot:

[0116] (1a) Polish the oxide film on the surface of Ni, Nb and Ti, and then press Ni 60 Nb 25 Ti 10 The atomic percentage ratio is prepared and placed in a beaker filled with absolute alcohol to prevent its oxidation;

[0117] (1b) Stack Ni, Nb and Ti prepared in order according to the melting point from low to high in the water-cooled copper mold crucible;

[0118] (1c) Cover the furnace cover and vacuumize twice before the formal smelting, each time the vacuum reaches 6.0×10 -3 Pa and filled with high-purity Ar gas to dilute residual oxygen;

[0119] (1d) After twice vacuuming, charge high-purity Ar gas of 0.05MPa atmospheric pressure to dilute residual oxygen in the furnace;

[0120] (1e) Turn on the magnetic stirring to smelt the alloy, turn over t...

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Abstract

The invention discloses a method using nanocrystalline to refine an aluminum alloy and improve strength and toughness. The method comprises the following steps of (1) preparing a multi-element metal glass alloy ingot; (2), preparing a metal glass thin strip; (3) preparing a nanocrystalline thin strip; (4) crushing the nanocrystalline thin strip; (5) preparing a nano-crystal-containing prefabricated block; (6) performing hot-extrusion forming on the nano-crystal-containing prefabricated block; (7) preparing the aluminum alloy which is reinforced and treated by novel nanocrystalline; and (8) performing heat treatment on the reinforced aluminum alloy. According to the technical scheme, the steps are reasonable. The room temperature strength and toughness of the aluminum alloy is greatly improved while the structure is refined, and especially the room temperature strength and the fracture strain of the aluminum alloy is greatly improved. The method is high in efficiency and low in cost, and has huge industrial application potential and value.

Description

technical field [0001] The invention relates to the field of forming and processing aluminum alloys and aluminum alloy parts, in particular to a method for refining aluminum alloys and improving strength and toughness by utilizing nanocrystals. Background technique [0002] Today, with the rapid development of high-tech fields such as aerospace, automobiles, and national defense, not only the lightweight of structural materials is required, but also the requirements for their comprehensive performance are getting higher and higher. Aluminum alloy is an important structural material and lightweight material. With the development of science and technology and industry, the demand for lightweight, high-strength and high-toughness aluminum alloy structural materials is increasing. In the production process of cast aluminum alloy, the as-cast aluminum alloy has a coarse structure, and it needs to be modified to refine the microstructure and improve the comprehensive mechanical p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C21/02C22F1/043
CPCC22C1/026C22C1/03C22C21/02C22F1/043C22C1/12
Inventor 邱丰朱琳常芳姜启川
Owner JILIN UNIV
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