Influence of Erbium Addition on the Microstructural Evolution and Tensile Properties of Al/Mg2Si in-situ Metal Matrix Composites

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2021-03-10 DOI:10.22068/IJMSE.18.1.8

Z. Rousta, E. Tohidlou, H. Khosravi

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引用次数: 1

Abstract

This study deals with the effects of Erbium (Er) addition on the microstructural evolution and tensile properties of Al-Mg2Si in-situ metal matrix composites. The morphology of primary Mg2Si and eutectic phases were observed in detail using an optical microscope and scanning electron microscopy (SEM). The results showed that the increase of Er content has a slight effect on the size and morphology of primary Mg2Si phases, but the eutectic structure evolves from the coarse structure into the fine one. Also, with Er addition, the eutectic mixtures of Al and Mg2Si with fibrous morphology have been developed instead of the flake-like Al-Mg2Si eutectic microstructure. Meanwhile, the Al3Er phase was observed in the samples containing Er. The ultimate tensile strength (UTS) of the composite changes under the various contents of Er. The maximum strength was found at 0.6 wt.% Er with the fine eutectic microstructure. The study of SEM micrographs from the fracture surface of composites revealed that Er addition changes the fracture mode from brittle to ductile one with fine dimples. The mechanism of microstructural evolution was discussed in detail.

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掺铒对Al/Mg2Si原位金属基复合材料显微组织演变及拉伸性能的影响

研究了铒（Er）的添加对Al-Mg2Si原位金属基复合材料微观结构演变和拉伸性能的影响。利用光学显微镜和扫描电子显微镜（SEM）详细观察了初生Mg2Si和共晶相的形态。结果表明，Er含量的增加对初生Mg2Si相的尺寸和形貌影响不大，但共晶结构由粗晶结构演变为细晶结构。此外，加入Er后，形成了具有纤维状形态的Al和Mg2Si的共晶混合物，而不是片状的Al-Mg2Si共晶组织。同时，在含有Er的样品中观察到Al3Er相。在不同的Er含量下，复合材料的极限抗拉强度（UTS）发生了变化。最大强度在0.6 wt.%Er处，具有精细的共晶组织。通过对复合材料断口SEM显微照片的研究表明，Er的加入使复合材料的断裂模式由脆性变为韧性，并具有细小的韧窝。详细讨论了微观结构演变的机理。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.