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Ytterbium micro-alloyed aluminium-copper-magnesium-silver-manganese system high-strength deforming heat-stable aluminium alloy and preparation method thereof

A micro-alloying, aluminum-copper-magnesium technology, which is applied in the field of high-strength heat-resistant aluminum alloys of aluminum-copper-magnesium-silver-manganese series and its preparation, can solve the problems that the tensile strength at room temperature is not significantly improved and cannot meet the requirements of practical applications.

Inactive Publication Date: 2007-09-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the analysis of the results of patents and publication reports, it is found that the high temperature heat resistance of Al-Cu-Mg-Ag alloys exceeds that of 2618 aluminum alloy and 2219 aluminum alloy, but the increase in the tensile strength at room temperature is not obvious, and the high temperature strength , especially the high temperature strength above 250 °C is far from meeting the requirements of practical applications
At present, there is no literature report on the use of ytterbium microalloying technology to promote the transformation of Al-Cu-Mg-Ag-Mn alloy structure and improve its heat resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 0.05% Yb to the aluminum-copper-magnesium-silver-manganese alloy. Alloy, Al-4Yb master alloy) was smelted in the SG-12-13 medium frequency induction resistance furnace, and used C 2 Cl 6 Carry out scouring treatment, after standing still, slag removal, cast into a round billet through an iron mold, after homogenization treatment at 460°C, hot extrusion at 400°C to form a bar, and then solid solution quenching at 515°C, then proceed at 150°C Artificial aging. The composition and weight percentage of the alloy are 6.5% Cu, 0.82% Mg, 0.65% Ag, 0.45% Mn, 0.15% Zr, 0.05% Yb, and the rest is Al. The tensile strength σ of the alloy b : Room temperature≥540MPa, 200℃≥415MPa, 300℃≥220MPa.

Embodiment 2

[0020] Add 0.05% Yb to the aluminum-copper-magnesium-silver-manganese alloy. Alloy, Al-4Yb master alloy) was smelted in the SG-12-13 medium frequency induction resistance furnace, and used C 2 Cl 6 Carry out scouring treatment, after standing still, slag removal, cast into a round billet through an iron mold, after homogenization treatment at 480°C, hot extrusion at 380°C to form a bar, and then solid solution quenching at 520°C, then proceed at 165°C Artificial aging. The composition and weight percentage of the alloy are 5.0% Cu, 0.5% Mg, 0.55% Ag, 0.60% Mn, 0.05% Zr, 0.05% Yb, and the rest is Al. The tensile strength σ of the alloy b : Room temperature≥530MPa, 200℃≥400MPa, 300℃≥210MPa.

Embodiment 3

[0022] Add 0.15% Yb to the aluminum-copper-magnesium-silver-manganese alloy. Alloy, Al-4Yb master alloy) was smelted in the SG-12-13 medium frequency induction resistance furnace, and used C 2 Cl 6 Carry out scouring treatment, after standing still, slag removal, cast into a round billet through an iron mold, after homogenization treatment at 460°C, hot extrusion at 400°C to form a bar, and then solid solution quenching at 515°C, then proceed at 150°C Artificial aging. The composition of the alloy and its white ratio by weight are 6.0% Cu, 0.75% Mg, 1.5% Ag, 0.42% Mn, 0.25% Zr, 0.15% Yb, and the rest is Al. The tensile strength σ of the alloy b : Room temperature≥560MPa, 200℃≥430MPa, 300℃≥250MPa.

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Abstract

The invention relates to ytterbium-microalloyed aluminium copper madnesium silver manganese series aluminium alloy with high deforming and heat resisting, and a method for preparing it. The invention is used in the field of structural material with high performance. The specific composition of the invention and weight percentage are: Cu: 4-6.5%, Mg: 0.5-1.2%, Ag: 0.4-1.5%, Mn: 0.2-0.6%, Zr: 0.05-0.25%, Yb: 0.05-0.55%, the residuel of Al. Micro-ytterbium is added into the existing aluminium copper madnesium silver manganese series alloy and the formed alloy component is not changed, while the function of micro-ytterbium fines original cast structure of aluminium copper madnesium silver manganese series alloy. Integrated strength and heat resisting under high temperature of the alloy are improved in the invention, while the performances of the alloy exceed traditional 2618aluminium alloy, 2219 aluminium alloy and Polmear aluminium alloy.

Description

technical field [0001] The invention belongs to the technical field of metal materials with high-performance structures. The invention relates to an aluminum-copper-magnesium-silver-manganese-based high-strength heat-resistant aluminum alloy and a preparation method thereof. Background technique [0002] Aluminum-copper heat-resistant aluminum alloy is a typical age-hardening aluminum alloy. Its main alloying elements are Al, Cu, Mg, Mn, Zr, Ti, etc. It is used for its good heat resistance and high specific strength. For aerospace structural materials. At present, the heat-resistant aluminum alloys widely used in industry are 2618 aluminum alloy and 2219 aluminum alloy. The typical composition of 2618 aluminum alloy is: 2.3wt% Cu ~ 1.6wt% Mg ~ 1.1wt% Fe ~ 1.0wt% Ni ~ 0.18wt% Si ~ 0.05wt% Ti, the rest is Al, and its room temperature tensile strength σ b 441MPa, σ at 200°C b 321MPa, σ at 300°C b is 60MPa. Another typical heat-resistant aluminum alloy is 2219 aluminum all...

Claims

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Application Information

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IPC IPC(8): C22C21/12C22F1/057
Inventor 肖代红
Owner CENT SOUTH UNIV
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