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High-strength high-fracture-toughness aluminum alloy bar and preparation method thereof

A high-fracture, aluminum-alloy technology, which is applied in the field of scandium-containing aluminum-zinc-magnesium alloy rods and its preparation, can solve the problems of weakening the anti-crack propagation effect of Sc elements and reducing fracture toughness, so as to improve the resistance to crack initiation and high Fracture toughness, the effect of improving the mechanical properties of alloys

Active Publication Date: 2020-02-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These patents are characterized by a higher Zn / Mg ratio, which can effectively improve the strength of the alloy, but a large amount of MgZn produced 2 The second phase of the grain boundary has an adverse effect on the improvement of fracture toughness, and the addition of Mn element is easy to form acicular second phase with impurity Fe element, which weakens the anti-crack propagation effect brought by the addition of Sc element, resulting in a significant decrease in fracture toughness

Method used

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  • High-strength high-fracture-toughness aluminum alloy bar and preparation method thereof
  • High-strength high-fracture-toughness aluminum alloy bar and preparation method thereof

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Experimental program
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Embodiment 1

[0026] The constituent elements of the bar are: 5wt% Mg, 2wt% Zn, 0.4wt% Sc, 92.6wt% Al, and the content of Fe, Si and other impurity elements is ≤0.1wt%.

[0027] According to the ratio, the aluminum ingot with a purity ≥ 99.9% is melted in a graphite crucible of an intermediate frequency induction melting furnace. After it is completely melted, the temperature of the molten aluminum is 660°C-670°C. For zinc ingots and Al-2% Sc master alloys, heat up to 730°C for full stirring after the alloy is melted, refine and degas at 720°C after standing for 20 minutes, let stand for 20 minutes after removing slag from the melt, and quickly melt the molten metal at 700°C Pouring into aluminum alloy ingots; brighten the surface of the ingots, preheat the ingots and carry out hot extrusion at an extrusion ratio of 25, the extrusion temperature is 300, 350°C, and obtain rods after post-treatment. Its mechanical properties at room temperature are shown in Table 1. It can be seen that the y...

Embodiment 2

[0029] The constituent elements of the bar are: Mg 2wt%, Zn 5wt%, Sc 0.4wt%, Al 92.6wt%, Fe, Si and other impurity elements content ≤ 0.1wt%.

[0030]According to the ratio, the aluminum ingot with a purity ≥ 99.9% is melted in a graphite crucible of an intermediate frequency induction melting furnace. After it is completely melted, the temperature of the molten aluminum is 660°C-670°C. For zinc ingots and Al-2% Sc master alloys, heat up to 730°C for full stirring after the alloy is melted, refine and degas at 720°C after standing for 20 minutes, let stand for 20 minutes after removing slag from the melt, and quickly melt the molten metal at 700°C Pouring into aluminum alloy ingots; brighten the surface of the ingots, preheat the ingots and carry out hot extrusion at an extrusion ratio of 25, the extrusion temperature is 300, 350°C, and obtain rods after post-treatment. Its mechanical properties at room temperature are shown in Table 1. It can be seen that the yield strength ...

Embodiment 3

[0036] The constituent elements of the bar are: Mg 3wt%, Zn 1wt%, Sc 0.3wt%, Fe, Si and other impurity elements content ≤ 0.1wt%, the balance is aluminum Al.

[0037] According to the ratio, the aluminum ingot with a purity ≥ 99.9% is melted in a graphite crucible of an intermediate frequency induction melting furnace. After it is completely melted, the temperature of the molten aluminum is 660°C-670°C. For zinc ingots and Al-2% Sc master alloys, heat up to 740°C for full stirring after the alloy is melted, refine and degas at 730°C after standing for 20 minutes, let stand for 20 minutes after removing slag from the melt, and quickly melt the molten metal at 710°C Pouring into aluminum alloy ingots; brighten the surface of the ingots, preheat the ingots and carry out hot extrusion at an extrusion ratio of 50, the extrusion temperature is 300, 350 ° C, and obtain rods after post-treatment. The yield strength of the bar is 250-264MPa, the tensile strength is 386-405MPa, the elon...

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Abstract

The invention relates to a high-strength high-fracture-toughness aluminum alloy bar and a preparation method thereof. The bar comprises the following components of, by mass percent, 1-5wt% of Zn, 2-5wt% of Mg, 0.3-1wt% of Sc, 0-0.1% of the sum of other impurity elements and the balance Al. The preparation method comprises the following specific steps that (1) an aluminum ingot is heated to be melted into molten aluminum, and a magnesium ingot, a zinc ingot and aluminum-scandium master alloy are added; (2) after sufficient stirring and still standing are conducted by rising the temperature to 730-740 DEG C, refining degassing, slag removal and heat preservation still standing are conducted at the temperature of 720-730 DEG C, and an aluminum alloy cast ingot is formed through casting at thetemperature of 700-710 DEG C; and (3) the aluminum alloy cast ingot is subjected to hot extrusion and follow-up heat treatment, and the high-strength high-fracture-toughness aluminum alloy bar is formed. Compared with the prior art, the aluminum-zinc-magnesium-scandium bar prepared through the invention has the high strength, the tensile strength reaches 495 MPa, the yield strength reaches 415 MPa, the elongation percentage is larger than 10%, and the plane strain fracture toughness reaches up to 55 MPa.m<1 / 2>.

Description

technical field [0001] The invention belongs to the technical field of manufacturing aluminum alloy structural materials, and in particular relates to a scandium-containing aluminum-zinc-magnesium alloy rod and a preparation method thereof. Background technique [0002] Al-Zn-Mg series (7xxx series) alloy, as a heat treatment-strengthened ultra-high-strength aluminum alloy, has the characteristics of high strength, low density and good thermal processing performance, and is widely used in the aerospace field. However, with the development of aerospace technology, the requirements for metal structural materials are increasing day by day, which not only need to meet the strength requirements, but also meet important application indicators such as fracture toughness. At present, the plane strain fracture toughness of commonly used 7xxx series aluminum alloys is 20-40MPa m 1 / 2 It is of great significance to improve the fracture toughness while improving the strength of Al-Zn-Mg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/06C22C21/10C22C1/03C22F1/047C22F1/053
CPCC22C21/06C22C21/10C22C1/03C22C1/026C22F1/047C22F1/053
Inventor 应韬汤晓漪李德江曾小勤
Owner SHANGHAI JIAO TONG UNIV
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