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A kind of high-strength and high-fracture-toughness aluminum alloy bar and its preparation method

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 alloy's resistance to crack initiation and The effect of expansion ability, high fracture toughness and high strength

Active Publication Date: 2022-02-11
SHANGHAI JIAOTONG 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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  • A kind of high-strength and high-fracture-toughness aluminum alloy bar and its preparation method
  • A kind of high-strength and high-fracture-toughness aluminum alloy bar and its preparation method

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Effect test

Embodiment 1

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

[0027] According to the ratio, aluminum ingots with a purity of ≥99.9% are melted in a graphite crucible of an intermediate frequency induction melting furnace. 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; brightening the surface of the ingots, preheating the ingots and performing hot extrusion at an extrusion ratio of 25 at extrusion temperatures of 300 and 350°C to obtain rods after post-treatment. Its mechanical properties at room temperature are shown in Table 1. It can be seen that the yield strength of the bar is 249-264MPa, the tensile strength is 386-405MPa, the elongation i...

Embodiment 2

[0029] The constituent elements of the rod 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, aluminum ingots with a purity of ≥99.9% are melted in a graphite crucible of an intermediate frequency induction melting furnace. 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; brightening the surface of the ingots, preheating the ingots and performing hot extrusion at an extrusion ratio of 25 at extrusion temperatures of 300 and 350°C to obtain rods after post-treatment. Its mechanical properties at room temperature are shown in Table 1. It can be seen that the yield strength of the bar is 311-414MPa, the tensile strength is 495-522MPa, the elongation is...

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 and high-fracture-toughness aluminum alloy bar and a preparation method thereof. The bar comprises the following components and mass percentages: zinc Zn is 1wt% to 5wt%, magnesium Mg is 2wt% to 5wt%, and scandium Sc is 0.3 ~1wt%, the total mass percentage of other impurity elements≤0.1%, and the balance is aluminum Al. The specific preparation method is as follows: (1) heat the aluminum ingot until it is melted into molten aluminum, add magnesium ingot, zinc ingot and aluminum-scandium master alloy; (2) raise the temperature to 730-740°C for full stirring, after standing still, heat Refining and degassing at 730°C, deslagging and heat preservation, then casting into aluminum alloy ingots at 700-710°C; (3) Hot extrusion and subsequent heat treatment of aluminum alloy ingots to form high-strength and high-fracture-toughness aluminum alloys Alloy bars. Compared with the prior art, the aluminum-zinc-magnesium-scandium bar prepared by the present invention has high strength, the tensile strength reaches 495MPa, the yield strength reaches 415MPa, the elongation is greater than 10%, and the plane strain fracture toughness is as high as 55MPa 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 Patents(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 JIAOTONG UNIV
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