A model for the precipitate transformation of Mg–Si-rich clusters into Mg5Si6 β″ in Al–Mg–Si aluminum alloys

IF 1.9 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Modelling and Simulation in Materials Science and Engineering Pub Date : 2024-09-03 DOI:10.1088/1361-651x/ad6ea8

Y V Shan, A Redermeier, R Kahlenberg, E Kozeschnik

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Abstract

A model is developed that describes the kinetics of precipitate transformations in the course of natural and artificial aging of Al alloys containing Mg and Si additions. In our approach, the disordered Mg–Si-rich clusters, which form during natural aging in the highly supersaturated Al matrix, can directly transform into the monoclinic Mg₅Si₆ (β″), without prior dissolution of the clusters and independent nucleation of β″ in the Al matrix. The transformation rate is evaluated with classical nucleation theory (CNT), assuming that the clusters represent an infinitely large matrix phase in which the β″ precipitates can nucleate. The adapted CNT model is described, and the basic features of the precipitate transformation are discussed in a parameter study. The model can also account for the observation that, during natural aging, the parent clusters occur in a variety of Mg to Si ratios, all of which have a characteristic probability of either transforming into the β″ phase or dissolving.

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铝镁硅铝合金中富镁硅团块向 Mg5Si6 β″ 沉淀转化的模型

我们建立了一个模型来描述含镁和硅的铝合金在自然和人工老化过程中的沉淀转化动力学。在我们的方法中，自然时效过程中在高度过饱和铝基体中形成的无序富镁硅簇可直接转变为单斜 Mg5Si6 (β″)，而无需事先溶解簇和在铝基体中独立成核β″。根据经典成核理论（CNT）对转化率进行了评估，假设簇代表一个无限大的基体相，β″沉淀可以在其中成核。描述了经调整的 CNT 模型，并在参数研究中讨论了沉淀转化的基本特征。在自然老化过程中，母簇会以各种镁硅比出现，所有这些母簇都有转化为β″相或溶解的特征概率，该模型也能解释这一观察结果。

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来源期刊

Modelling and Simulation in Materials Science and Engineering 工程技术-材料科学：综合

CiteScore

3.30

自引率

5.60%

发文量

审稿时长

1.7 months

期刊介绍： Serving the multidisciplinary materials community, the journal aims to publish new research work that advances the understanding and prediction of material behaviour at scales from atomistic to macroscopic through modelling and simulation. Subject coverage: Modelling and/or simulation across materials science that emphasizes fundamental materials issues advancing the understanding and prediction of material behaviour. Interdisciplinary research that tackles challenging and complex materials problems where the governing phenomena may span different scales of materials behaviour, with an emphasis on the development of quantitative approaches to explain and predict experimental observations. Material processing that advances the fundamental materials science and engineering underpinning the connection between processing and properties. Covering all classes of materials, and mechanical, microstructural, electronic, chemical, biological, and optical properties.