A kind of preparation method of nanocrystalline aluminum alloy plate material

A technology of aluminum alloy plate and aluminum alloy plate, which is applied in the field of material processing, can solve problems such as difficulty in producing ultra-fine grain structure, coarse grain structure strength, low recrystallization driving force, etc., and achieve remarkable grain refinement effect, Short production cycle, improved strength and plasticity

Active Publication Date: 2019-03-26
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at "aluminum alloy has high stacking fault energy and low recrystallization driving force, and it is difficult to produce ultra-fine grain structure under conventional rolling process, and it is produced under the condition of severe plastic deformation technology (SPD) The resulting grain structure is coarse and the strength is low”, and a method of ultra-refining aluminum alloy grains by cryogenic rolling and subsequent low-temperature rapid annealing process was proposed.
At the same time, this process can also be used in the field of nanocrystalline preparation of non-ferrous metals with a face-centered cubic structure, solving the problems of excessive deformation or small sample size during cold processing at room temperature in other processes, and preparing ultra-fine-grained aluminum alloy sheets with high strength and toughness

Method used

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  • A kind of preparation method of nanocrystalline aluminum alloy plate material
  • A kind of preparation method of nanocrystalline aluminum alloy plate material
  • A kind of preparation method of nanocrystalline aluminum alloy plate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] An ultra-fine-grained aluminum alloy plate, its chemical composition and mass percentage are: Si: 0.45%, Mg: 1.0%, Cu: 0.15%, Mn: 0.15%, Cr: 0.24%, Zn: 0.25%, Ti: 0.15%, the balance is Al and unavoidable impurities. The thickness of the ultrafine-grained aluminum alloy plate is 1 mm.

[0046] The preparation method of the above-mentioned ultrafine-grained aluminum alloy plate specifically includes the following steps:

[0047] Step 1, hot rolling:

[0048] (1) Heat an aluminum alloy billet with a thickness of 25mm to 450°C in a resistance furnace and keep it warm for 2h;

[0049] (2) Hot rolling the aluminum alloy billet after heat preservation for 7 passes, the starting rolling temperature is 450°C, the final rolling temperature is 280°C, the total cumulative reduction rate is 80%, and then air-cooled to room temperature to obtain a thickness of 5mm hot rolled plate;

[0050] Step 2, cryogenic rolling:

[0051] (1) Solution treatment: heat the hot-rolled plate to 53...

Embodiment 2

[0058] An ultra-fine-grained aluminum alloy plate, its chemical composition and mass percentage are: Si: 0.45%, Mg: 1.0%, Cu: 0.15%, Mn: 0.15%, Cr: 0.24%, Zn: 0.25%, Ti: 0.15%, the balance is Al and unavoidable impurities. The thickness of the ultra-fine grain aluminum alloy plate is 1.75mm.

[0059] The preparation method of the above-mentioned ultrafine-grained aluminum alloy plate specifically includes the following steps:

[0060] Step 1, hot rolling:

[0061] (1) Heat an aluminum alloy billet with a thickness of 25mm to 450°C in a resistance furnace and keep it warm for 2h;

[0062] (2) Hot rolling the aluminum alloy billet after heat preservation for 7 passes, the starting rolling temperature is 450°C, the final rolling temperature is 280°C, the total cumulative reduction rate is 80%, and then air-cooled to room temperature to obtain a thickness of 5mm hot rolled plate;

[0063] Step 2, cryogenic rolling:

[0064] (1) Solution treatment: heat the hot-rolled plate to...

Embodiment 3

[0071] An ultra-fine-grained aluminum alloy plate, its chemical composition and mass percentage are: Si: 0.45%, Mg: 1.0%, Cu: 0.15%, Mn: 0.15%, Cr: 0.24%, Zn: 0.25%, Ti: 0.15%, the balance is Al and unavoidable impurities. The thickness of the ultra-fine grain aluminum alloy plate is 2mm.

[0072] The preparation method of the above-mentioned ultrafine-grained aluminum alloy plate specifically includes the following steps:

[0073] Step 1, hot rolling:

[0074] (1) Heat an aluminum alloy billet with a thickness of 25mm to 450°C in a resistance furnace and keep it warm for 2h;

[0075] (2) The aluminum alloy billet after heat preservation is subjected to 6 passes of hot rolling, the rolling temperature is 450°C, the final rolling temperature is 300°C, the total cumulative reduction rate is 75%, and then air-cooled to room temperature to obtain a thickness of 5mm hot rolled plate;

[0076] Step 2, cryogenic rolling:

[0077] (1) Solution treatment: heat the hot-rolled plate...

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Abstract

The invention relates to a preparation method of a nanocrystal aluminum alloy sheet, in particular to a method for preparing an aluminum alloy sheet with excellent performance by rolling and rapid annealing under the low-temperature condition of liquid nitrogen and belongs to the technical field of material machining. The preparation method of the nanocrystal aluminum alloy sheet comprises deep cooling rolling and annealing steps; and the deep cooling rolling step comprises the substeps: carrying out cold rolling on the aluminum alloy sheet, and carrying out liquid nitrogen treatment on the aluminum alloy sheet before carrying out every pass of cold rolling to prepare the aluminum alloy sheet subjected to deep cooling rolling, wherein the accumulative total reduction rate of cold rolling is 40-80%, and the reduction rate of every pass is 5-10%. By using a deep cooling rolling-rapid annealing process, the crystal grain refining effect is remarkable, the strength and the plasticity are obviously improved, a crystal grain can be refined to the grade of 100 nm, the yield strength reaches up to 464MPa, the tensile strength reaches up to 489MPa, and the plastic extensibility reaches up to 16%.

Description

technical field [0001] The invention relates to a method for preparing a nanocrystalline aluminum alloy plate, in particular to a method for preparing an aluminum alloy plate with excellent performance by rolling and rapid annealing under low temperature conditions of liquid nitrogen, and belongs to the technical field of material processing. Background technique [0002] Aluminum and aluminum alloys, as a kind of traditional metal materials with a large quantity and wide range after steel, play a very important or even irreplaceable role in the national economy and national defense construction. Due to the low density of aluminum alloy and higher specific strength than copper alloy, ductile iron and carbon steel, it has been widely used in transportation machinery, chemical machinery, building materials, sports equipment, household appliances, appliances, etc., especially in aviation The development of high and new technologies such as aerospace and aerospace has put forwar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/047B21C37/02
CPCB21C37/02C22F1/047
Inventor 吴红艳杨丽娟张加美魏子荐翁镭杜预杜林秀
Owner NORTHEASTERN UNIV LIAONING
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