High-strength high-toughness weldable in-situ nano-reinforced rare earth aluminum alloy and preparation method thereof

An aluminum alloy, in-situ technology, applied in the field of aluminum alloy materials, can solve the problems of composite material performance impact, rare earth strengthening effect limited, material performance deterioration, etc., to improve wetting and bonding strength, improve weldability, and uniform distribution Effect

Active Publication Date: 2021-09-17
JIANGSU UNIV
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Problems solved by technology

The invention patent with the application number "CN201811286812.1" reported "a method for preparing an in-situ dual-phase nanoparticle-reinforced aluminum-based composite material", which uses the melt direct reaction method to in-situ synthesize ZrB in aluminum alloys 2 +Al 2 o 3 particles, forming a dual-phase particle-reinforced aluminum matrix composite material. However, due to the agglomeration of the nanoparticles themselves, the performance of the composite material will be affected, and the introduction of dual-phase nanoparticles does not solve this problem well.
The invention patent with the application number "CN202011069290.7" reports "an aluminum alloy material and its preparation method". This method adds rare earth Ce+Tb to the aluminum alloy to improve the mechanical properties and corrosion resistance of the aluminum alloy. , die-casting performance, weldability, wear resistance and thermal conductivity. However, due to the excessive addition of rare earths, the material properties will deteriorate. A small amount of rare earths has a limited strengthening effect, and the comprehensive performance of aluminum alloys needs to be further improved.

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  • High-strength high-toughness weldable in-situ nano-reinforced rare earth aluminum alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The chemical composition of the rare earth aluminum alloy is (mass percentage): Zn: 6.02, Mg: 2.59, Mn: 0.76, Cr: 0.11, Cu: 0.23, Zr: 1.80, Ti: 1.82, B: 0.80, O: 0.20, Er: 0.10, Sc: 0.12, Y: 0.10, and the rest are Al.

[0037] Weigh a certain amount of K 2 ZrF 6 、K 2 TiF 6 、KBF 4 and Na 2 B 4 o 7 , after dehydration at 200°C for 3 hours, mix and grind evenly; put pure aluminum in a crucible, use an induction coil to heat and melt, keep the temperature of the aluminum liquid at 850°C, wrap the reactant powder after mixing and grinding with aluminum foil and use a bell jar Press into the molten aluminum to fully react; turn on the electromagnetic control device and ultrasonic, the pulse width is 500μs, the frequency is 10Hz, the peak intensity of the pulsed magnetic field is 1T, the ultrasonic power is 5kW, the ultrasonic treatment is 10min, the interval is 2min, the reaction is 30min, and the temperature of the melt is lowered. To 750°C, add pure Cu, pure Zn, Al-Mn...

Embodiment 2

[0039] Zn: 5.03, Mg: 2.06, Mn: 0.71, Cr: 0.13, Cu: 0.25, Zr: 2.30, Ti: 2.26, B: 1.90, O: 0.45, Er: 0.2, Sc: 0.2, Y: 0.21, and the rest Al.

[0040] Weigh a certain amount of K 2 ZrF 6 、K 2 TiF 6 、KBF 4 and Na 2 B 4 o 7 , after dehydration at 200°C for 3 hours, mix and grind evenly; put pure aluminum in a crucible, use an induction coil to heat and melt, keep the temperature of the aluminum liquid at 870°C, wrap the reactant powder after mixing and grinding with aluminum foil and use a bell jar Press into the molten aluminum to fully react; turn on the electromagnetic and ultrasonic control device, the pulse width is 1ms, the frequency is 12Hz, the peak intensity of the pulsed magnetic field is 3T, the ultrasonic power is 6kw, the ultrasonic treatment is 10min, the interval is 2min, the reaction is 25min, and the melt temperature drops to 760°C, add pure Cu, pure Zn, Al-Mn, Al-Cr, Al-Zr, Al-Sc, Al-Er, Al-Y. React for 10 minutes, remove slag after the reaction, refine a...

Embodiment 3

[0042] Rare earth aluminum alloy composition: Zn: 6.99, Mg: 2.98, Mn: 0.74, Cr: 0.15, Cu: 0.28, Zr: 3.11, Ti: 3.23, B: 2.45, O: 0.53, Er: 0.3, Sc: 0.3 , Y: 0.3, the rest is Al.

[0043] Weigh a certain amount of K 2 ZrF 6 、K 2 TiF 6 、KBF 4 and Na 2 B 4 o 7 , after dehydration at 200°C for 3 hours, mix and grind evenly; put pure aluminum in a crucible, use an induction coil to heat and melt, keep the temperature of the aluminum liquid at 890°C, wrap the reactant powder after mixing and grinding with aluminum foil and use a bell jar Press into the molten aluminum to fully react; turn on the electromagnetic and ultrasonic control device, the pulse width is 5ms, the frequency is 15Hz, the peak intensity of the pulsed magnetic field is 5T, the ultrasonic power is 10kW, the ultrasonic treatment is 10min, the interval is 2min, the reaction is 20min, and the temperature of the melt is lowered. To 770 ℃, add pure Cu, pure Zn, Al-Mn, Al-Cr, Al-Zr, Al-Sc, Al-Er, Al-Y. React for ...

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Abstract

The invention relates to an aluminum alloy material, in particular to a high-strength high-toughness weldable in-situ nano-reinforced rare earth aluminum alloy and a preparation method thereof. According to the high-strength high-toughness weldable in-situ nano-reinforced rare earth aluminum alloy and the preparation method, in-situ nano ceramic particles and rare earth elements are simultaneously introduced into the Al-Zn-Mg alloy, and therefore crystal grains can be effectively refined, the strength and toughness of the alloy are remarkably improved, the recrystallization temperature of the alloy can be remarkably improved through the rare earth nano precipitated phase and the in-situ nano particles which are distributed in the crystal / grain boundary, dynamic recovery is effectively inhibited, redissolution of alloy elements is reduced, and the weldability of the alloy is improved.

Description

technical field [0001] The invention relates to an aluminum alloy material, in particular to a high-strength and toughness weldable in-situ nano-reinforced rare earth aluminum alloy and a preparation method thereof. [0002] technical background [0003] Al-Zn-Mg series aluminum alloy is a medium-high-strength aluminum alloy that can be strengthened by heat treatment. It has high specific strength, good formability and weldability, and is widely used in aerospace, rail transit, military equipment and other fields, especially high-speed trains In the manufacture of aluminum alloys, Al-Zn-Mg series aluminum alloys are widely used in its important load-bearing parts. However, at present, only relying on alloying to increase the strength is close to the limit and the weldability is poor, which cannot meet the increasing demand for the performance of aluminum alloys. Therefore, it is necessary to seek a new method for strengthening aluminum alloys. [0004] At present, the method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C32/00C22C1/10C22F1/053
CPCC22C21/10C22C32/0005C22C1/1036C22F1/053C22C1/1052B22D11/003C22C21/003B22D11/114C22F1/002C22C32/0036C22C21/08C22C1/0416C22F1/04
Inventor 怯喜周陈锐崐彭艳杰武林陶然梁向锋陈刚赵玉涛
Owner JIANGSU UNIV
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