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Fast aging response type Al-Mg-Si-Cu-Zn series alloy and preparation method thereof

An al-mg-si-cu-zn, aging technology, applied in the field of aluminum alloy, can solve the problem of reducing the hardening ability of alloy baking paint

Inactive Publication Date: 2014-05-14
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Considering that reducing the content of solute elements Mg, Si, Cu and Fe can reduce the strength of the T4 state alloy and improve the formability of the alloy, but the reduction of Mg, Si and Cu elements will also reduce the paint hardening ability of the alloy

Method used

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  • Fast aging response type Al-Mg-Si-Cu-Zn series alloy and preparation method thereof
  • Fast aging response type Al-Mg-Si-Cu-Zn series alloy and preparation method thereof
  • Fast aging response type Al-Mg-Si-Cu-Zn series alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0041] After the invention alloys 1#, 2# and 5# are smelted and cast, they are subjected to homogenization treatment. The treatment process is: start to heat up at a heating rate of 20-40°C / h, and keep warm for 2~ 5h, then continue to heat up at 20-40°C / h to 545-555°C for 14-20h, and then take out the sample when cooling down to 100°C with the furnace at a cooling rate of 20-40°C / h. Then directly cut the sample from the homogenized bulk material and place it in a salt bath furnace for 545-555°C / 1-6min solid solution treatment (i.e., carry out 1-6min in a salt bath furnace at 545-555°C solution treatment) and water quenching treatment, and then directly placed in an aging furnace at 185°C for artificial aging at different times to compare the aging precipitation behavior of various alloys (see figure 1 shown).

Embodiment 2

[0043] After the invention alloys 1#, 2#, 3#, 4# and 5# are smelted and cast, they are homogenized. The treatment process is: start to heat up at a heating rate of 20-40°C / h, and wait until the temperature reaches 470 Insulate at ~485°C for 2~5h, then continue to heat up at 20~40°C / h to 545~555°C for 14~20h, and then take out the sample when cooling down to 100°C with the furnace at a cooling rate of 20~40°C / h . Then cut the sample directly from the homogenized bulk material and place it in a salt bath furnace for 545~555℃ / 1-6min solid solution and water quenching treatment, and then directly perform natural aging at room temperature to measure the alloy Variation law of hardness with natural aging time (see figure 2 shown). In addition, DSC analysis was carried out on the 14-day natural aging sample. The specific implementation plan is: cut out a disc with a diameter of 3mm×1mm and a mass of about 15mg, and use a differential scanning calorimeter Q2000 (DSC) for differenti...

Embodiment 3

[0045] After the invention alloys 1#, 2#, 3#, 4# and 5# are smelted and cast, they are homogenized. The treatment process is: start to heat up at a heating rate of 20-40°C / h, and wait until the temperature reaches 470 Insulate at ~485°C for 2~5h, then continue to heat up at 20~40°C / h to 545~555°C for 14~20h, and then take out the sample when cooling down to 100°C with the furnace at a cooling rate of 20~40°C / h . Then directly cut the sample from the homogenized block material and place it in a salt bath furnace for 545~555℃ / 1-6min solid solution and water quenching treatment, and then carry out natural aging for 14 days at room temperature (T4 state), and finally carry out artificial aging treatment on the natural aging state samples at 185°C for different times, and measure the change law of hardness of the alloy (see Figure 4 shown).

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Abstract

The invention provides a novel Al-Mg-Si-Cu-Zn series alloy with fast aging response and a preparation method thereof. According to the invention, the novel Al-Mg-Si-Cu-Zn series alloy shows excellent fast aging response characteristic in an aging process by sufficiently utilizing the synergetic precipitation effect and synergetic strengthening effect of the main strengthening phases Mg2Si, MgZn2 and transitional phase of an Al-Mg-Si series alloy and an Al-Zn-Mg-Cu series alloy; the natural aging deterioration effect of a common Al-Mg-Si-Cu series alloy is certainly inhibited due to the simultaneous addition of Mg, Si, Cu and Zn elements and the addition of element Zn especially, the novel Al-Mg-Si-Cu-Zn series alloy has low strength and high room temperature stability after being subjected to preaging treatment at a certain temperature, which is favorable to the subsequent stamping forming of an alloy plate; a preaging-state alloy is greatly enhanced in strength after being subjected to high-temperature aging treatment and achieves the highest strength increment approaching to 150 MPa far higher than that of the traditional AA6016 and AA6111 alloys through short-term artificial aging at 185 DEG C for 20 minutes; the fast aging response characteristic is not only suitable for the preparation of an automobile outside plate, but also suitable for the related field with a special requirement on the aging precipitation speed of the alloy plate.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, and relates to a novel Al-Mg-Si-Cu-Zn alloy that can be applied industrially and a preparation method thereof, especially developed for the aluminum alloy with fast aging response characteristics urgently needed in the automotive field, and can be used Guarantee the dual requirements of high formability and high paint hardening performance for aluminum alloys for lightweight automotive body panels. Background technique [0002] In recent years, with the continuous acceleration of the lightweight process of automobiles, the development and related research of aluminum alloy sheets for automobiles have also made great progress, especially because aluminum alloys have the advantages of low density, high strength, corrosion resistance and high formability. , and its application in the lightweight process of automobiles has also increased rapidly. Typical aluminum alloys for automobile body p...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C21/08C22C21/10C22C21/18C22F1/04
CPCC22C21/02C22C21/08C22C21/10C22C21/18C22F1/04
Inventor 郭明星庄林忠张济山胡晓倩张巧霞崔莉
Owner UNIV OF SCI & TECH BEIJING
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