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Preparation and ageing treatment process for novel Al-Mg-Si-Er aluminum alloy plate material

An aluminum alloy sheet and aging treatment technology, applied in the field of metal alloys, can solve the problems of reducing the precipitation time of aging precipitates, stress corrosion, and limiting the scope of application.

Active Publication Date: 2011-04-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regarding the role of Sc in Al-Mg-Si aluminum alloys, studies have shown that Sc can refine the grains of Al-Mg-Si alloys, improve the stability of grains, and accelerate the process of grain refinement during plastic deformation. Reduce the precipitation temperature of the precipitated phase during the aging process and increase the recrystallization temperature, but the expensive price of Sc greatly limits its application range, but the application of rare earths in aluminum-magnesium-silicon alloys, except for Sc, is mostly mixed Rare earths, and Er, whose price is only a few tenths of Sc, has many positive effects in high-purity aluminum, aluminum-magnesium and other alloys, and can be used as a substitute element for Sc elements. The previous experimental results also show that Er has Alloys have certain positive effects: such as refining grains, reducing aging activation energy, and reducing the precipitation time of aging precipitates
When the United States was studying the 7075 alloy, it solved the problem of stress corrosion well through a regression reaging process, but this process has been technically blocked
In addition, since the Al-Mg-Si alloy is an alloy that can be strengthened by heat treatment, there are many reports on the heat treatment system of the alloy, but the research on the mechanical properties and microhardness changes of the Al-Mg-Si alloy containing Er during the aging process rarely reported

Method used

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  • Preparation and ageing treatment process for novel Al-Mg-Si-Er aluminum alloy plate material
  • Preparation and ageing treatment process for novel Al-Mg-Si-Er aluminum alloy plate material
  • Preparation and ageing treatment process for novel Al-Mg-Si-Er aluminum alloy plate material

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Experimental program
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Effect test

Embodiment 1

[0018] Put the pre-prepared high-purity aluminum ingot into the graphite crucible. After the aluminum ingot is completely melted, add aluminum-silicon and aluminum-erbium alloys in sequence, and finally add high-purity magnesium ingot. At the same time, wrap the magnesium ingot with aluminum foil. After all the metals are melted After adding hexachloroethane (the content is 2% of the mass of the metal raw material) and stirring evenly, let it stand still, remove the slag, and finally pour the molten metal into an iron mold whose inner wall is coated with a mixed solution of zinc oxide and water glass. After the ingot was homogenized in an air circulation furnace at 560°C for 6 hours, the surface scale and defects were milled on a machine tool to prepare for rolling. Before rolling, the metal ingot is heated to 450°C for 2 hours, hot-rolled and cold-rolled on a 310×480mm twin-roll rolling mill, with about 13 passes in between, and the final thickness is about 2mm. ℃ for 40 minu...

Embodiment 2

[0020] Al-Mg-Si-Er alloy plates were aged at 180°C for different times, figure 1 It is the age hardening curve of Al-Mg-Si-Er alloy at 180°C. Through different aging times at 180°C, it can be seen that as the aging time prolongs, the microhardness of the alloy first increases and then decreases. When the aging time is 7h, the microhardness of the alloy is the highest, which means that the aging time can reach fully aged condition.

Embodiment 3

[0022] The Al-Mg-Si-Er alloy plate was aged at 180°C for 7 hours, then regressed at 220°C for 1 hour, and finally aged at a lower temperature of 150°C for different times. The age hardening curve is shown in figure 2 .

[0023] From figure 2 It can be seen that the alloy reached the peak aging state after aging at 180°C for 7 hours, and then regressed at 220°C for 1 hour to dissolve the second phase particles that precipitated first into the collective, and finally re-aged at a lower temperature of 150°C Microhardness change curve, the hardness value of the alloy is the highest at 8 hours.

[0024] Table 1 lists the tensile mechanical properties of Al-Mg-Si-Er alloys after peak aging after different heat treatment processes.

[0025]

[0026] image 3 The microstructure of the alloy reflects that the needle-shaped second phase particles β″ mainly appeared in the alloy under the peak aging state, and a small amount of spherical particles also appeared, which may be unde...

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Abstract

The invention discloses preparation and an ageing treatment process for a Al-Mg-Si-Er aluminum alloy plate material, belonging to the technical field of metal alloy. The preparation method comprises the following steps: preparing metal ingots by adopting a semi-continuous casting method; homogenizing the metal ingots; respectively performing hot rolling and cold rolling on a rolling mill of 310*480mm, wherein the heating temperature of the hot rolling is 450 DEG C; and preserving the temperature for 2 hours, wherein the final rolling thickness is about 2mm. One process condition is that: 1 to 50 hours of ageing heat treatment is performed at 180 DEG C after solution treatment; and the other process condition is that: 1 hour of regression heat treatment is performed at 220 DEG C based on 7 hours of ageing at 180 DEG C, and the alloy is re-aged for 1 to 24 hours at 150 DEG C after regression treatment. The alloy treated by the process has higher strength, the 230MPa using performance requirement of the alloy can be well fulfilled, and the corrosion resistance and plasticity of the alloy can be improved.

Description

technical field [0001] The invention belongs to the technical field of metal alloys, and in particular relates to a preparation and aging treatment process for Al-Mg-Si-Er alloy plates. Background technique [0002] The literature shows that rare earth microalloying is an important means of strengthening aluminum alloys at present. As long as a few per thousand scandium is added to aluminum, it will have a metamorphic effect on aluminum alloys, resulting in significant changes in the structure and properties of the alloys. Adding 0.2% to 0.4% of Sc can increase the recrystallization temperature of the alloy by 150 to 200°C, and the high temperature strength, structural stability, welding performance and corrosion resistance are all significantly improved, and it can avoid the occurrence of embrittlement phenomenon. High-strength and high-toughness aluminum alloys, new high-strength corrosion-resistant weldable aluminum alloys, new high-temperature aluminum alloys, high-stre...

Claims

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Application Information

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IPC IPC(8): C22F1/05
Inventor 聂祚仁张尧苏学宽
Owner BEIJING UNIV OF TECH
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