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New high-strength quick-hardened Al-Mg-Si-Cu alloy used for automobile body and preparation method of alloy

A rapid hardening, automobile body technology, applied in the field of aluminum alloy materials, to achieve the effect of high corrosion resistance, high aging strength, and low rate

Active Publication Date: 2017-07-11
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The root cause of this phenomenon is that only the influence of Mg / Si or Cu content on alloy texture properties has been clarified, but the properties of 6000 series aluminum alloys are mainly determined by the joint influence of Mg / Si and Cu, while Mg / Si and Cu The effect of Cu co-variation on the structure and properties of alloys has not been clearly understood

Method used

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  • New high-strength quick-hardened Al-Mg-Si-Cu alloy used for automobile body and preparation method of alloy
  • New high-strength quick-hardened Al-Mg-Si-Cu alloy used for automobile body and preparation method of alloy
  • New high-strength quick-hardened Al-Mg-Si-Cu alloy used for automobile body and preparation method of alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0027] An excess Mg high Cu alloy by mass consists of the following components: Mg: 1.17wt.%; Si: 0.57wt.%, Cu: 0.5wt.%, Mn: 0.06wt.%, Fe: 0.17wt.% , The rest is Al.

[0028] The alloy uses 99.98% industrial pure aluminum, pure Mg, Al-Si master alloy and Al-Cu master alloy as raw materials. Under the condition of a melting temperature of 660°C, firstly add industrial pure aluminum and add Al-Si after it is completely melted Master alloy; after completely melted, add Al-Cu master alloy, after completely melted, add pure Mg to ensure uniform mixing of the melt, then pour the melt into water-cooled steel molds with length, width, and height of 300mm, 200mm, and 60mm respectively. , And then cut the ingot, and sequentially carry out homogenization treatment, solution water quenching, and aging treatment. The cold-rolled sheet is first subjected to solution treatment at 560°C for 30 minutes, and then water quenched to room temperature, followed by 3 types of aging treatments: 1. Afte...

Embodiment 2

[0047] An excess Mg high Cu alloy by mass consists of the following components: Mg: 1.17wt.%; Si: 0.57wt.%, Cu: 0.5wt.%, Mn: 0.06wt.%, 0.17wt.%, and the rest Is Al.

Embodiment 3

[0049] An excess Mg high Cu alloy by mass consists of the following components: Mg: 1wt.%; Si: 0.3wt.%, Cu: 1.5wt.%, Mn: 0.20wt.%, Fe: 0.1wt.%, The rest is Al.

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Abstract

The invention relates to a new high-strength quick-hardened Al-Mg-Si-Cu alloy used for an automobile body and a preparation method of the alloy. The alloy comprises the following components, by mass, 1-2.8 wt% of Mg, 0.3-1 wt% of Si, 0.5-1.5 wt% of Cu, wherein the ratio of Mg to Si in the alloy is more than 2, no more than 0.5 wt% of Mn, and no more than 0.2 wt% of Fe, with the balance being Al. Through increase of the ratio of Mg to Si and the Cu content, a new excessive-Mg high-Cu 6000-series aluminium alloy taking a disordered L phase as a main hardening constituent is designed. Compared with an AA6022 alloy widely applied in the industry at the present, the alloy is relatively low in T4-state yield strength, has high precipitation dynamics, baking hardenability and thermal stability during artificial aging, has no influence on corrosion resistance, and has great potential for application to an outer plate of an automobile body.

Description

Technical field [0001] The invention relates to an aluminum alloy material, in particular to a novel high-strength and fast-hardening Al-Mg-Si-Cu alloy for automobile body and a preparation method thereof. Background technique [0002] Lightweighting of automobiles is one of the most effective measures to reduce energy consumption and emissions. Relevant studies have shown that every 10% reduction in automobile weight can reduce fuel consumption by 6% to 8% and emissions by 4%. International advanced automobile companies have made great progress in realizing the lightweighting of vehicles by selecting lightweight materials, and aluminum alloy materials are currently the preferred lightweight materials. 6000 series aluminum alloy has medium to high strength, good formability and corrosion resistance, and good weldability, high surface quality after baking, and can be heat treated and strengthened. It is currently the key material for lightweight automobile body, with 6016, 6111 ,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/08C22C21/14C22C21/16C22C1/03C22F1/047C22F1/057
CPCC22C1/026C22C1/03C22C21/08C22C21/14C22C21/16C22F1/002C22F1/047C22F1/057
Inventor 贾志宏丁立鹏邹芸翁瑶瑶刘庆
Owner CHONGQING UNIV
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