Al-Mg-Si-Cu-Ti-Sr alloy and method for making same

An al-mg-si-cu-ti-sr, al-ti-si technology, applied in the field of Al-Mg-Si-Cu-Ti-Sr alloy and its preparation, can solve the problem of poor modification effect and casting performance. Poor, incomplete deterioration and other problems, to achieve the effects of low cost, improved mechanical properties, and stable composition

Inactive Publication Date: 2007-02-21
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 2000 series Al-Cu-Mg alloy has good forgeability, high strength and good welding performance, but its corrosion resistance is poor
The 5000 series Al-Mg based alloy has good strength, formability and corrosion resistance, but its casting performance is poor, and it has delayed yield, and it is an alloy that cannot be strengthened by heat treatment
If the amount of Sr added is too small, it will cause incomplete deterioration, and if it is added too much, the effect of deterioration will be deteriorated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] to 10 # Alloy as an example (alloy composition wt%, Mg 1.27%, Si 1.24%, Cu 0.85%, Mn0.43%, Ti 0.20%, Sr 0.015%)

[0049] Prepare:

[0050] The mold adopts metal type 45mm×200mm×350mm. The inner wall of the mold, the inner wall of the funnel, the slag removal and refining tools are derusted and coated with high alumina paint; the metal mold is preheated to 150-200°C (measured by a surface thermometer), the funnel is preheated to 180-200°C, and it is ready to be poured Immediately place in the mold.

[0051] Preheat the intermediate preheating alloys Al-50Cu, Al-10Sr, Mg at 150-180°C for 0.5-1 hour.

[0052] use KNO 3 + Graphite powder (weight ratio 30:1) is used as a refining agent, preheated at 150-200°C for 1-2 hours.

[0053] Smelting:

[0054] Put the Al-10Mn alloy and about 2 / 3 Al-Si-Ti alloy into the crucible and raise the temperature with the furnace. The furnace temperature is raised to 900-1000°C to make the heating temperature faster, and the rest of the ...

Embodiment 2

[0069] to 11 # An alloy is taken as an example (alloy composition wt%, Mg 1.02%, Si 1.15%, Cu 0.71%, Mn 0.46%, Ti 0.19%, Sr 0.033%).

[0070] Its preparation and smelting process are with embodiment 1.

[0071] Rolled plate:

[0072] Homogenization heat treatment is carried out before the slab is re-rolled. The homogenization treatment process is: the slab is heated with the furnace, heated to 500-520°C, and kept for 8-9 hours;

[0073] The slab is heated before hot rolling, the heating temperature is 500-520°C, and the heat preservation is 1-2 hours. The hot rolling is carried out in four passes, and the thinning amount of each pass is 40-50%. The final rolling temperature of hot rolling is not lower than 290°C, the final rolling thickness of the slab is 3.4-3.5mm;

[0074] After hot rolling, the sheet is cold-rolled, and the cold-rolling is carried out in three passes, and the thinning amount of each pass is 30-40%, and the sheet is rolled to 1mm in the last pass;

[007...

Embodiment 3

[0079] to 15 # An alloy is taken as an example (alloy composition wt%, Mg 1.08%, Si 1.05%, Cu 0.73%, Mn 0.42%, Ti 0.16%, Sr 0.09%).

[0080] Its preparation and smelting process are with embodiment 1.

[0081] Rolled plate:

[0082] Homogenization heat treatment is carried out before the slab is re-rolled. The homogenization treatment process is: the slab is heated with the furnace, heated to 480-500°C, and kept for 7-8 hours;

[0083] The slab is heated before hot rolling, the heating temperature is 500-510°C, and the heat preservation is 1-1.5 hours. The hot rolling is carried out in four passes, and the thinning amount of each pass is 40-50%. 290°C, the final rolling thickness of the slab is 3.7-3.8mm;

[0084] After hot rolling, the sheet is cold-rolled, and the cold-rolling is carried out in three passes, and the thinning amount of each pass is 30-40%, and the sheet is rolled to 1mm in the last pass;

[0085] The plate after cold rolling is solution quenched, and its ...

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Abstract

The invention provides a Al-Mg-Si-Cu-Ti-Sr alloy for preparing car body plate. The alloy consists of Al, Mg, Si, Cu, Mn, Ti, and Sr, and the contents of the components (by weight) are as follows: Mg: 1.0-1.5%, S: 1.0-1.5%, Cu: 0.5-1.0%, Mn: 0.1-0.6%, Ti: 0.1-0.3%, Sr: 0.01-0.1%, Al: the rest. The invention also provides the preparing method, characterized by preparing Al-Si-Ti alloy and other required elements by direct electrolytic method. The alloy plate provided by the invention has improved mechanical property and shaping property.

Description

[0001] Field [0002] The invention belongs to the technical field of Al-Mg-Si-based alloy materials, and in particular relates to Al-Mg-Si-Cu-Ti-Sr alloy and a preparation method thereof. Background technique: [0003] At present, the commonly used aluminum alloys for body panels mainly include Al-Cu-Mg-based (2000 series), Al-Mg-based (5000 series) and Al-Mg-Si-based (6000 series) alloys. Among them, 2000 series and 6000 series are alloys that can be strengthened by heat treatment, and series 5000 are alloys that cannot be strengthened by heat treatment. The 2000 series Al-Cu-Mg alloy has good forgeability, high strength and good welding performance, but its corrosion resistance is poor. The 5000 series Al-Mg base alloy has good strength, formability and corrosion resistance, but its casting performance is poor, and it has delayed yield, and it is an alloy that cannot be strengthened by heat treatment. The 6000-series Al-Mg-Si alloy has suitable strength and formability, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/08
Inventor 关绍康卢广玺陈海军石广新
Owner ZHENGZHOU UNIV
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