Ultra-low temperature rolling preparation method of wrought al-mg alloy with ultra-high mg content

An ultra-low temperature and alloy technology, applied in the field of materials, can solve the problems that the porosity and porosity of the as-cast structure cannot be eliminated, damage the plasticity of the Al-Mg alloy, and the grains of the as-cast state cannot be refined, so as to achieve the accumulation and strengthening of dislocations. Grain boundary strengthening effect, effect of improving plasticity

Active Publication Date: 2020-01-14
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the limitation of the size and quantity of the prepared materials, the industrialization of the severe plastic deformation method is very difficult
The disadvantages of the nanocrystalline powder route of consolidation mechanical alloying are also obvious: higher cost; impurities introduced during mechanical alloying impair the plasticity of Al-Mg alloys
The Mg content in the industrialized cast Al-Mg alloy can be as high as 12% by mass. Since the limit solid solubility of Mg in Al is 17% by mass, all Mg is solid-dissolved into the Al matrix through solution treatment, effectively Realize the solid solution strengthening of Mg; however, due to no plastic deformation, the dislocation density in the alloy is low and lacks dislocation strengthening, the pores and porosity in the as-cast structure cannot be eliminated, the coarse as-cast grains cannot be refined, and the pores and The existence of these two factors of coarse grains seriously damages the plasticity of Al-Mg alloys

Method used

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  • Ultra-low temperature rolling preparation method of wrought al-mg alloy with ultra-high mg content
  • Ultra-low temperature rolling preparation method of wrought al-mg alloy with ultra-high mg content
  • Ultra-low temperature rolling preparation method of wrought al-mg alloy with ultra-high mg content

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Experimental program
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Effect test

Embodiment 1

[0034] Add pure Mg and pure Al to a vacuum resistance melting furnace for smelting according to the mass percentage of Mg of 11%, and electromagnetically stir to make the composition of the liquid Al-11wt.% Mg alloy (wt.% represents mass percentage) uniform, and pour it into a cast iron mold An Al-11 wt.% Mg alloy ingot was obtained. First, in the nitrogen protection atmosphere heating furnace, the ingot is heated to a temperature of 425°C, which is 80°C lower than the Al-11wt.%Mg alloy solidus temperature of 505°C. At this time, the Al-11wt.%Mg alloy is in a single-phase solid solution State, keep at this temperature for 8 hours, and carry out the homogenization treatment of the composition of the ingot. Next, the Al-11wt.% Mg alloy ingot that has been homogenized is put into a hot-press furnace protected by nitrogen, and kept at 425°C and a pressure of 75MPa for 2.5 hours, and is densified by hot pressing. Eliminates porosity in cast alloys. Then, reheat the Al-11wt.% Mg a...

Embodiment 2

[0037] According to the mass percentage of Mg, pure Mg and pure Al are added into a vacuum induction melting furnace for melting, and the electromagnetic stirring effect of the induction melting furnace itself makes the composition of the liquid Al-14wt.% Mg alloy uniform, and then pours it into a cast iron mold to obtain Al-14wt.% Mg alloy ingot. First, in a heating furnace with a nitrogen protective atmosphere, the ingot is heated to a temperature of 430°C, which is 45°C lower than the solidus temperature of the Al-14wt.%Mg alloy at 475°C. At this time, the Al-14wt.%Mg alloy is in a single-phase solid solution State, keep at this temperature for 12 hours, and carry out the homogenization treatment of the composition of the ingot. Next, the homogenized Al-14wt.%Mg alloy ingot is hot-extruded at 430° C. with an area shrinkage ratio of 6 to completely eliminate the pores in the cast alloy. Then, reheat the Al-14wt.% Mg alloy that has been homogenized and densified in a nitroge...

Embodiment 3

[0040] According to the mass percentage of Mg, pure Mg and pure Al are added to the vacuum induction melting furnace for melting, and the electromagnetic stirring effect of the induction melting furnace itself makes the composition of the liquid Al-11wt.% Mg alloy uniform, and then it is poured into a cast iron mold to obtain Al-11wt.% Mg alloy ingot. First, in the nitrogen protection atmosphere heating furnace, the ingot is heated to a temperature of 425°C, which is 80°C lower than the Al-11wt.%Mg alloy solidus temperature of 505°C. At this time, the Al-11wt.%Mg alloy is in a single-phase solid solution State, keep at this temperature for 8 hours, and carry out the homogenization treatment of the composition of the ingot. Next, hot rolling the Al-11wt.% Mg alloy ingot treated with homogenization at 425° C. until the total reduction of the thickness is 50%, completely eliminates the pores in the cast alloy. Then, reheat the Al-11wt.% Mg alloy that has been homogenized and den...

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Abstract

The invention relates to an ultralow-temperature rolling preparation method for a deformed Al-Mg alloy with ultrahigh Mg content. The ultralow-temperature rolling preparation method comprises the following steps: performing component homogenizing treatment, compacting treatment and treatment for enabling solid solution to form a single-phase solid solution on a cast ingot of the Al-Mg alloy at a temperature lower than an alloy solid-phase line temperature of 0-80 DEG C; performing ultralow-temperature rolling; and annealing at a temperature of 50-200 DEG C to obtain the final deformed Al-Mg alloy with ultrahigh Mg content. The technology in the invention remarkably improve dislocations strengthening and grain boundary strengthening in the Al-Mg alloy with ultrahigh Mg content, improves strength, can be used for producing with high efficiency and low cost on a large scale, and has a wide industrial prospect.

Description

technical field [0001] The invention relates to the field of material technology, in particular to the ultra-low temperature rolling preparation method technology of deformed Al-Mg alloy with ultra-high Mg content. Background technique [0002] The 5000 series of non-age-hardening deformed Al-Mg alloys with Mg as the main alloying element are used in aircraft manufacturing in the aviation industry, design and manufacture of space devices in the aerospace industry, automobiles, high-speed rail and subway trains in ground transportation, and ships Manufacturing, petrochemical structures and tools, mobile phones, computers and other electronic devices have been widely used. The Mg content in the existing industrialized 5000 series deformed Al-Mg alloys is all below 5% (mass percentage), which limits the exertion of the solid solution strengthening effect of Mg. In the existing work, deformed Al-Mg alloys with Mg content greater than 5% (mass percent) are obtained through sever...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/047
CPCC22F1/002C22F1/047
Inventor 林耀军刘志波施江
Owner WUHAN UNIV OF TECH
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