High-performance Al-Mg-Si alloy and preparation method thereof

An al-mg-si, high-performance technology, applied in the field of high-performance Al-Mg-Si alloy and its preparation, can solve the problems of low mechanical properties of alloy materials, low production efficiency, complex process, etc., and achieve high yield strength. , The effect of reducing process cost and simple operation

Active Publication Date: 2021-03-19
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, the process of preparing Al-Mg-Si aluminum alloy is relatively complicated, the cost is high, and the production efficiency is low. In addition, the mechanical properties of the prepared alloy materials are not high.

Method used

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  • High-performance Al-Mg-Si alloy and preparation method thereof
  • High-performance Al-Mg-Si alloy and preparation method thereof
  • High-performance Al-Mg-Si alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Al-Mg-Si alloy, described alloy is made up of following composition by mass percentage:

[0033] Mg: 0.5%; Si: 1.0%; Fe: 0.2%; Ti: 0.1%; Zr: 0.1%; the sum of unavoidable impurities ≤ 0.15%; the rest is Al; the above Al-Mg-Si alloy, the preparation method is as follows:

[0034] (1) Add 99.98% industrial pure aluminum ingots, pure magnesium, Al-Si master alloy, Al-Ti master alloy and Al-Zr master alloy to the melting furnace in turn and heat and melt at 750°C until the raw materials are stirred After melting, the alloy melt was obtained after blowing in argon gas for 10 minutes;

[0035] (2) Drain the alloy melt obtained in step (1) into the gap of the water-cooled copper roll for casting and rolling. The roll diameter of the water-cooled copper roll is Φ260mm, the thickness of the roll sleeve is 20mm, and the gap distance between the rolls is 4.5mm. The linear speed is 65mm / s, and the casting and rolling slab of sub-rapid solidification alloy is obtained, and the thick...

Embodiment 2

[0039] Al-Mg-Si alloy, described alloy is made up of following composition by mass percentage:

[0040] Mg: 0.7%; Si: 1.2%; Fe: 0.17%; Ti: 0.05%; Zr: 0.05%; the sum of unavoidable impurities ≤ 0.15%; the rest is Al; the above Al-Mg-Si alloy, the preparation method is as follows:

[0041] (1) Add 99.98% industrial pure aluminum ingots, pure magnesium, Al-Si master alloy, Al-Ti master alloy and Al-Zr master alloy to the melting furnace in turn and heat and melt at 750°C until the raw materials are stirred After melting, the alloy melt was obtained after blowing in argon for 12 minutes;

[0042] (2) the alloy melt obtained in step (1) is drained into the gap of the water-cooled copper roll for casting and rolling. The roll diameter of the water-cooled copper roll is Φ270mm, the thickness of the roll sleeve is 23mm, and the gap distance between the rolls is 4mm. The line speed is 70mm / s, and the sub-rapid solidification alloy cast-rolled billet is obtained, and the thickness of t...

Embodiment 3

[0046] Al-Mg-Si alloy, described alloy is made up of following composition by mass percentage:

[0047]Mg: 0.75%; Si: 1.3%; Fe: 0.17%; Ti: 0.15%; Zr: 0.15%; the sum of unavoidable impurities ≤ 0.15%; the rest is Al; the above Al-Mg-Si alloy, the preparation method is as follows:

[0048] (1) Add 99.98% industrial pure aluminum ingots, pure magnesium, Al-Si master alloy, Al-Ti master alloy and Al-Zr master alloy to the melting furnace in turn and heat and melt at 750°C until the raw materials are stirred After melting, the alloy melt was obtained after blowing in argon for 14 minutes;

[0049] (2) drain the alloy melt obtained in step (1) into the gap of the water-cooled copper roll for casting and rolling. The roll diameter of the water-cooled copper roll is Φ300mm, the thickness of the roll sleeve is 27mm, and the gap distance between the rolls is 7mm. The line speed is 42mm / s, and the sub-rapid solidification alloy cast-rolled slab is obtained, and the thickness of the cast...

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Abstract

The invention discloses a high-performance Al-Mg-Si alloy and a preparation method thereof. The alloy is composed of the following components in percentage by mass of 0.50 to 0.85% of Mg, 0.80 to 1.30% of Si, 0.10 to 0.35% of Fe, 0.03-0.25% of Ti, 0.03-0.30% of Zr, smaller than or equal to 0.15% of the sum of inevitable impurities and the balance Al. The alloy preparation method is a short-processsub-rapid solidification cast-rolling preparation method and comprises the five steps of alloy smelting, water-cooling copper roller cast-rolling, multi-pass cold rolling, solid solution heat treatment and artificial aging. The preparation method has the advantages that a formed Al-Ti-Zr ternary phase effectively inhibits abnormal growth of crystal grains in the Al-Mg-Si alloy, the thermal stability of the alloy is remarkably improved, the distribution and the size of a precipitated phase are improved, and precipitation strengthening is improved; a supersaturated solid solution Zr element isintroduced to participate in the nano Mg2Si phase precipitation process through sub-rapid solidification cast rolling, the aging dynamics is promoted, and the age hardening response is improved; and after artificial aging, alloy grains are uniform and fine, the yield strength is high and reaches 312 MPa, and meanwhile high plasticity is kept. According to the preparation method, the technologicalprocess steps and time are shortened, the quality of a plate strip is high, and the yield is high.

Description

technical field [0001] The invention relates to the technical field of nonferrous metals, in particular to a high-performance Al-Mg-Si alloy and a preparation method thereof. Background technique [0002] As the world's natural environment and energy problems become increasingly severe, the social demand for lightweight automobiles is very strong. Lightweight automobile bodies can reduce energy consumption and emissions and improve efficiency, which is of great significance. Aluminum alloy has high specific strength and specific stiffness, corrosion resistance, good formability and high recycling rate, and is an ideal material for realizing lightweight vehicles. [0003] Al-Mg-Si aluminum alloy is an aging aluminum alloy that can be strengthened by heat treatment. Because of its good formability during processing and high yield strength after age hardening, it is considered to be the most promising automotive body material. Al-Mg-Si aluminum alloys are widely used in the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C21/08C22C1/03C22F1/043C22F1/047
CPCC22C21/02C22C21/08C22C1/03C22C1/026C22F1/043C22F1/047C22F1/002
Inventor 王慧远蒋俊王珵查敏贾海龙施枭张少游刘旭张明雪莫媛婷
Owner JILIN UNIV
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