Effect of chemical composition and heat treatment on intergranular corrosion and strength of AlMgSiCu alloys

IF 1.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

High Temperature Materials and Processes Pub Date : 2023-01-01 DOI:10.1515/htmp-2022-0284

O. H. Çelik, O. Yücel

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引用次数: 0

Abstract

Abstract The use of aluminum in chassis, bumper, and crash boxes has increased in the last 10 years with an increase in the production of electric vehicles in the automotive industry. The extrusion process has also gained importance because it allows mass production. While basic 6xxx series aluminum alloys such as 6060 and 6063 were used in the early stages of the process, later on, 6005A and 6082 alloys, which provide higher strength, have been used. Alloys with higher strength and crash ability are needed with an increase in safety requirements in automotive. In this study, the effect of chemical composition and heat treatment on the intergranular corrosion strength of 6056 alloys was examined. Another aim of this study is not only to produce high strength and ductility alloy but also to provide good corrosion resistance as automotives are used in different environments for several decades. The 6056 alloys are potential candidate materials for the new-generation electrical vehicles in the automobile industry due to their high strength, weldability, machinability, and impact resistance. Therefore, in our work, we produced 6056 alloy samples in a billet form using the direct chill casting method. Then they were homogenized, and billets were extruded as a box profile. Experimental studies were carried out on 6056 alloys with two different chemical compositions and three different heat treatment conditions (T42, T62, and T76) using Method B of EN ISO 11846 standard for corrosion testing. Crack sizes of metallographic sections from corroded areas were calculated g using a scanning electron microscope. As a result, we found that the addition of Mg to 6056 alloys improves corrosion resistance, while copper reduces it. When Zn is added to the alloys, Mg starts to react with it and forms MgZn2, which increases the corrosion progress. Moreover, when heat treatment is applied at T76 conditions, the alloys demonstrate high corrosion resistance.

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化学成分和热处理对AlMgSiCu合金晶间腐蚀和强度的影响

摘要在过去10年中，随着汽车行业电动汽车产量的增加，铝在底盘、保险杠和防撞箱中的使用有所增加。挤压工艺也变得越来越重要，因为它允许大规模生产。虽然在工艺的早期阶段使用了基本的6xxx系列铝合金，如6060和6063，但后来使用了提供更高强度的6005A和6082合金。随着汽车安全要求的提高，需要具有更高强度和碰撞能力的合金。本研究考察了化学成分和热处理对6056合金晶间腐蚀强度的影响。这项研究的另一个目的不仅是生产高强度和延展性的合金，而且在汽车在不同环境中使用几十年时提供良好的耐腐蚀性。6056合金由于其高强度、可焊接性、机械加工性和抗冲击性，是汽车行业新一代电动汽车的潜在候选材料。因此，在我们的工作中，我们使用直接冷铸法生产了6056个坯料形式的合金样品。然后将它们均化，并将坯料挤压成箱形型材。采用EN ISO 11846标准的方法B对具有两种不同化学成分和三种不同热处理条件（T42、T62和T76）的6056合金进行了腐蚀试验研究。使用扫描电子显微镜计算腐蚀区域金相切片的裂纹尺寸g。因此，我们发现在6056合金中添加Mg可以提高耐腐蚀性，而铜可以降低耐腐蚀性。当向合金中添加Zn时，Mg开始与之反应并形成MgZn2，从而增加了腐蚀进度。此外，当在T76条件下进行热处理时，合金表现出高的耐腐蚀性。

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来源期刊

High Temperature Materials and Processes 工程技术-材料科学：综合

CiteScore

2.50

自引率

0.00%

发文量

审稿时长

3.9 months

期刊介绍： High Temperature Materials and Processes offers an international publication forum for new ideas, insights and results related to high-temperature materials and processes in science and technology. The journal publishes original research papers and short communications addressing topics at the forefront of high-temperature materials research including processing of various materials at high temperatures. Occasionally, reviews of a specific topic are included. The journal also publishes special issues featuring ongoing research programs as well as symposia of high-temperature materials and processes, and other related research activities. Emphasis is placed on the multi-disciplinary nature of high-temperature materials and processes for various materials in a variety of states. Such a nature of the journal will help readers who wish to become acquainted with related subjects by obtaining information of various aspects of high-temperature materials research. The increasing spread of information on these subjects will also help to shed light on relevant topics of high-temperature materials and processes outside of readers’ own core specialties.