Chemical composition dependent atom clustering during natural aging in Al-Mg-Si alloys

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Scripta Materialia Pub Date : 2025-03-01 Epub Date: 2024-11-30 DOI:10.1016/j.scriptamat.2024.116474

Chunan Li , Calin D. Marioara , Constantinos Hatzoglou , Sigmund J. Andersen , Randi Holmestad , Yanjun Li

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Abstract

In many industrial Al-Mg-Si alloys, natural aging (NA) has a detrimental effect on the age-hardening response during artificial aging (AA), due to the formation of unfavorable nanometer-sized solute clusters during NA. In this work, we systematically studied the atomic structures of solute clusters formed in a dilute 6060 alloy and a more concentrated 6082 alloy after 1-year NA and their influences on the age hardening behavior during the following AA. In 6060, it was found that NA promotes the formation of high-density solute clusters in the form of GP-zones composed of 1–3 β″-eyes, which can act as precursors of β″ precipitates, enhancing the age-hardening kinetics during AA. In contrast, most solute clusters in 6082 after 1-year NA are 1β″-eye, binocular and square GP-zones, while GP-zones containing multiple β″-eyes are rare. As a result, NA has a strong negative effect on the age-hardening response during AA and the peak-aged strength.

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Al-Mg-Si合金自然时效过程中依赖化学成分的原子聚类

在许多工业Al-Mg-Si合金中，自然时效（NA）对人工时效（AA）中的时效硬化反应有不利影响，因为在自然时效（NA）过程中会形成不利的纳米级溶质团簇。本文系统地研究了稀态6060合金和浓态6082合金经过1年NA后形成的溶质团簇的原子结构及其对后续AA时效硬化行为的影响。在1960年，发现NA促进了高密度溶质团簇的形成，形成由1-3 β″-眼组成的gp -带，它们可以作为β″沉淀的前体，增强了AA过程中的时效硬化动力学。相比之下，6082在1年后的NA中，大多数溶质团簇是1β″-眼，双目和方形gp -区，而含有多个β″-眼的gp -区是罕见的。因此，NA对AA过程中的时效硬化反应和峰值时效强度有较强的负向影响。

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.