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High-fracture-toughness aluminum magnesium scandium alloy rod and preparation method thereof

A technology for alloy rods and high fracture, which is applied in the field of high fracture toughness aluminum-magnesium-scandium alloy rods and its preparation, and can solve the problems of reduced fracture toughness, need for improvement, and increased mismatch between the second phase and the matrix

Inactive Publication Date: 2019-08-06
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the Mn element is easy to form a needle-like second phase with the impurity Fe element, which increases the misfit between the second phase and the matrix, weakens the anti-crack propagation effect brought by the addition of Sc element, and leads to a significant decrease in fracture toughness.
Therefore, the existing high-toughness aluminum-magnesium-scandium alloy preparation technology still needs to be improved

Method used

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  • High-fracture-toughness aluminum magnesium scandium alloy rod and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The constituent elements of the bar are: Mg 1wt%, Sc 0.4wt%, Al 98.6wt%, Fe, Si and other impurity elements content ≤ 0.1wt%.

[0026] According to the ratio, put the aluminum ingot with a purity ≥99.9% in a graphite crucible of an intermediate frequency induction melting furnace to melt it. After it is completely melted, the temperature of the molten aluminum is 660-670°C, and then add magnesium with a purity ≥99.9% to the molten aluminum. Ingot and Al-2%Sc master alloy, heat up to 730°C for full stirring after melting the alloy, refine and degas at 720°C after standing for 20 minutes, stand for 20 minutes after removing slag from the melt, and quickly pour the molten metal at 700°C Aluminum alloy casting ingot; brighten the surface of the ingot, preheat the ingot and carry out hot extrusion according to the extrusion ratio of 25, the extrusion temperature is 300, 350, 400°C, and the heat treatment program is 470°C-2h+120°C -16h+160°C-20min+120°C-16h to obtain Al-1Mg-0...

Embodiment 2

[0028] The constituent elements of the bar are: Mg 2wt%, Sc 0.4wt%, Al 98.6wt%, Fe, Si and other impurity elements content ≤ 0.1wt%.

[0029] According to the ratio, put the aluminum ingot with a purity ≥99.9% in a graphite crucible of an intermediate frequency induction melting furnace to melt it. After it is completely melted, the temperature of the molten aluminum is 660-670°C, and then add magnesium with a purity ≥99.9% to the molten aluminum. Ingot and Al-2%Sc master alloy, heat up to 730°C for full stirring after melting the alloy, refine and degas at 720°C after standing for 20 minutes, stand for 20 minutes after removing slag from the melt, and quickly pour the molten metal at 700°C Aluminum alloy casting ingot; brighten the surface of the ingot, preheat the ingot and carry out hot extrusion according to the extrusion ratio of 25, the extrusion temperature is 300, 350°C, and the heat treatment program is 470°C-2h+120°C-16h +160°C-20min+120°C-16h to obtain Al-2Mg-0.4Sc ...

Embodiment 3

[0031] The constituent elements of the bar are: Mg 5wt%, Sc 0.4wt%, Al 98.6wt%, Fe, Si and other impurity elements content ≤ 0.1wt%.

[0032]According to the ratio, put the aluminum ingot with a purity ≥99.9% in a graphite crucible of an intermediate frequency induction melting furnace to melt it. After it is completely melted, the temperature of the molten aluminum is 660-670°C, and then add magnesium with a purity ≥99.9% to the molten aluminum. Ingot and Al-2%Sc master alloy, heat up to 730°C for full stirring after melting the alloy, refine and degas at 720°C after standing for 20 minutes, stand for 20 minutes after removing slag from the melt, and quickly pour the molten metal at 700°C Aluminum alloy casting ingot; brighten the surface of the ingot, preheat the ingot and carry out hot extrusion according to the extrusion ratio of 25, the extrusion temperature is 300, 350°C, and the heat treatment program is 470°C-2h+120°C-16h +160°C-20min+120°C-16h to obtain Al-5Mg-0.4Sc a...

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Abstract

The invention relates to a high-fracture-toughness aluminum magnesium scandium alloy rod and a preparation method thereof. An alloy comprises the following components including, by mass, 1%-5% of Mg,0.25%-0.4% of Sc, not more than 0.1% of other impurity elements and the balance Al. The preparation method comprises the following steps that aluminum ingots, magnesium ingots and Al-Sc intermediate alloys are used as raw materials for step-by-step smelting after burdening in proportion; melts are cast after stirring, refining, purification, degassing, slagging and standing; cast ingots are extruded into rods according to an extrusion ratio of 25-50; the extrusion temperature is 300-400 DEG C; and the treatment procedure after extrusion is 470 DEG C-2 h+120 DEG C-16 h+160 DEG C-20 min+120 DEGC-16 h. Compared with the prior art, the prepared aluminum magnesium scandium rod achieves high rapture toughness, and achieves the mechanical performances of the tensile strength being 360-480 MPa, the yield strength being 260-350 MPa, the ductility being 10%-18% and the plane strain rupture toughness being 25-50 MPa.m1 / 2.

Description

technical field [0001] The invention relates to the field of alloy preparation, in particular to an aluminum-magnesium-scandium alloy bar with high fracture toughness and a preparation method thereof. Background technique [0002] As a light metal structural material, aluminum-magnesium alloys have medium strength because they do not contain zinc, but they have excellent thermal crack resistance, toughness, formability and corrosion resistance. They are often used in the aerospace industry middle. As an important structural material for parts such as aircraft skins, the safety requirements are extremely high, and fracture toughness is an important indicator to measure the comprehensive performance and safety of aluminum-magnesium alloys. The fracture toughness of traditional 5 series aluminum alloy is 20-30MPa m 1 / 2 , and in recent years, the discovery of the microalloying effect of scandium in aluminum alloys provides the possibility and basis for further improving the fr...

Claims

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Application Information

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IPC IPC(8): C22C21/06C22C1/03C22F1/047
CPCC22C1/026C22C1/03C22C21/06C22F1/047
Inventor 应韬汤晓漪谷立东曾小勤李德江
Owner SHANGHAI JIAO TONG UNIV
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