Tolerance of Al–Mg–Si Wrought Alloys for High Fe Contents: The Role of Effective Si

IF 2.2 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science Pub Date : 2023-09-10 DOI:10.1007/s11661-023-07180-z

J. A. Österreicher, A. R. Arnoldt, S. Gneiger, G. Kunschert

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引用次数: 0

Abstract

Abstract Aluminum scrap is often contaminated with steel parts, leading to accumulation of Fe in recycled Al alloys. Consequently, low limits for Fe in Al wrought alloys are difficult to meet by recycling without dilution with primary Al. Wrought alloys with a higher tolerance for Fe could help overcome this problem and improve the sustainability of Al wrought products. Here we study the effects of increasing the Fe content in EN AW-6060, 6005A, and 6082 from 0.2 to 0.7 wt pct. The microstructure and mechanical properties of the alloys after extrusion and artificial ageing are compared to the standard alloys. We found that 6082 is more tolerant to above-standard Fe contents than 6005A, which in turn is more tolerant than 6060: the strength of the 6082-based alloy with increased Fe content is comparable to that of standard 6082 and the elongation at break is increased. In contrast, the artificial ageing potential of the 6060-based alloy with more Fe is drastically reduced compared to 6060. This data and literature values show that the effective Si content is a good overall predictor of alloy strength. Effective Si is not bound in AlFeSi-type phases and is available for precipitation hardening. Additional effects of increased Fe levels are discussed.

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Al-Mg-Si变形合金对高铁含量的耐受性:有效Si的作用

摘要废铝常被钢件污染，导致铁在再生铝合金中富集。因此，通过不稀释原铝的循环利用，很难满足Al锻造合金中铁的低限值。具有更高铁耐受性的锻造合金可以帮助克服这一问题，提高Al锻造产品的可持续性。本文研究了将EN AW-6060、6005A和6082中Fe含量从0.2 wt %提高到0.7 wt %的效果，并与标准合金进行了挤压和人工时效后合金的组织和力学性能的比较。我们发现6082比6005A更能容忍超标准铁含量，6005A又比6060更能容忍超标准铁含量:随着铁含量的增加，6082基合金的强度与标准6082相当，断裂伸长率也有所提高。相比之下，含铁量较高的6060基合金的人工老化潜力大大降低。这一数据和文献值表明，有效硅含量是合金强度的一个很好的整体预测指标。有效Si不在alfesi型相中结合，可用于沉淀硬化。讨论了铁含量增加的附加效应。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science 工程技术-材料科学：综合

CiteScore

5.30

自引率

7.10%

发文量

322

审稿时长

6 months

期刊介绍： Metallurgical and Materials Transactions A focuses on the latest research in all aspects of physical metallurgy and materials science. It explores relationships among processing, structure, and properties of materials; publishes critically reviewed, original research of archival significance. The journal address the main topics of alloy phases; transformations; transport phenomena; mechanical behavior; physical chemistry; environment; welding & joining; surface treatment; electronic, magnetic & optical material; solidification; materials processing; composite materials; biomaterials; and light metals. MMTA publishes Technical Publications, Communications, Symposia, and more. Published with ASM International, The Materials Information Society and The Minerals, Metals & Materials Society (TMS)