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Method for restraining generation of A7N01 aluminum alloy surface coarse grain ring

A technology of A7N01 and aluminum alloy surface, which is applied in the production field of aluminum alloy, can solve the problems of increasing quenching sensitivity, reducing the quenching aging state of extruded products, the influence of alloy mechanical properties and fatigue properties, etc. Effect of coarse-grained ring defects

Inactive Publication Date: 2017-09-12
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coarse crystal rings not only reduce the quenching aging state of extruded products, but also have adverse effects on the mechanical properties and fatigue properties of the alloy
At present, the process and quality assurance measures to eliminate or reduce the coarse crystal ring are mainly realized by controlling the extrusion process, heat treatment process and adjusting the alloy composition, but the related measures will reduce the surface quality of the alloy, deteriorate the extrusion performance and mechanical properties, And increase the quenching sensitivity, so it is urgent to find a more effective method to suppress the generation of coarse crystal rings on the surface

Method used

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  • Method for restraining generation of A7N01 aluminum alloy surface coarse grain ring
  • Method for restraining generation of A7N01 aluminum alloy surface coarse grain ring
  • Method for restraining generation of A7N01 aluminum alloy surface coarse grain ring

Examples

Experimental program
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Effect test

Embodiment 1

[0023] In this example, the preparation process of the A7N01 aluminum alloy extruded product containing 0.06wt% scandium:

[0024] 1) The industrial pure Al, pure Zn, pure Mg, Al-Mn master alloy, Al-Cr master alloy, Al-Zr master alloy, Al-Ti master alloy are prepared according to the design composition, and the design composition meets the relevant standards of A7N01 aluminum alloy Regulations: In terms of element mass percentage, zinc: 4.13%, magnesium: 1.31%, manganese: 0.30%, chromium: 0.21%, zirconium: 0.10%, titanium: 0.06%, and the balance is aluminum and unavoidable impurities. And, a trace rare earth element scandium with a mass fraction of 0.06% is introduced by adding an Al-Sc master alloy to the raw material. The above raw materials are vacuum smelted in a graphite crucible furnace. First, pure Al and Al-Cr intermediate alloys are refined in a graphite crucible furnace for 15-20 minutes, and then the rest of the raw materials are added to melt at 720°C, followed by ...

Embodiment 2

[0030] In this embodiment, the preparation process of the A7N01 aluminum alloy extruded product containing 0.13wt% scandium: is consistent with the above method, the difference is that 0.13wt% scandium is added to the A7N01 aluminum alloy matrix. Its longitudinal microstructure is as image 3 shown, from image 3 It can be seen from the figure that there is still no coarse-grained ring defect at the edge of the extruded product, which is mainly due to the Al 3 The (Sc,Zr) dispersed phase strongly inhibits the effect of recrystallization. Compared with the A7N01 aluminum alloy containing 0.06wt% scandium, the microstructure of A7N01 aluminum alloy containing 0.13wt% scandium is further refined.

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Abstract

The invention relates to the production field of aluminum alloys, in particular to a method for restraining generation of an A7N01 aluminum alloy surface coarse grain ring. During alloy smelting, a trace rare earth element, namely scandium, is led in, the weight percentage of the scandium is 0.05%-0.15%, and a scandium contained A7N01 aluminum alloy casting ingot is prepared. The casting ingot is subject to homogenization treatment, extrusion forming, online air cooling and natural aging treatment, the defect of the coarse grain ring on the surface of an extrusion product is restrained, and the alloy microstructure is obviously refined. An A7N01 aluminum alloy comprises, by mass percentage, 4.0%-5.0% of zinc, 1.0%-2.0% of magnesium, not larger than 0.20% of copper, 0.20%-0.7% of manganese, not larger than 0.30% of chromium, not larger than 0.25% of zirconium, not larger than 0.20% of titanium, not larger than 0.10% of vanadium and the balance aluminum and inevitable impurities. According to the method, the trace rare earth element, namely scandium, is led in, a wee dispersed nanoscale Al3(Sc,Zr) phase is generated in an A7N01 aluminum alloy extrusion bar base, and the dispersion strengthening effect is achieved.

Description

technical field [0001] The invention relates to the production field of aluminum alloys, in particular to a method for suppressing the generation of coarse crystal rings on the surface of A7N01 aluminum alloys. Background technique [0002] A7N01 alloy is a 7xxx series aluminum alloy with Zn and Mg as the main alloying elements. It has good extrusion performance, can extrude thin-walled profiles with complex shapes, has good welding performance, high weld quality, and can effectively utilize the quality of aluminum alloys. Lightweight, high strength, good processability, weldable, corrosion-resistant, beautiful and other original characteristics, it is an ideal medium-strength welding structural material, widely used in rail vehicle structural parts. [0003] A7N01 aluminum alloy tends to form coarse crystal rings on the surface during extrusion, which is mainly due to the abnormal growth of recrystallized grains in the metal. Coarse-grained rings not only reduce the quench...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/03C22F1/053
CPCC22C21/10C22C1/026C22C1/03C22F1/053
Inventor 姜海昌李召明闫德胜王昀立付鸿戎利建
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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