Microstructure-Property Relationships in an Erbium-Modified Al-Si-Mg Alloy

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2020-09-10 DOI:10.22068/IJMSE.17.3.40

R. Niazi, E. Tohidlou, H. Khosravi

引用次数: 1

Abstract

The effect of erbium (Er) addition at various weight percentages (0-0.6 wt.% at an interval of 0.2) on the microstructural features, tensile properties and wear behavior of as-cast Al-7.5Si-0.5Mg alloy were evaluated. The microstructure of the specimens was examined by X-ray diffraction (XRD), optical microscopy (OM) and scanning electron microscopy (SEM). The obtained results clearly demonstrated that the incorporation of erbium decreased the α-Al grain size and eutectic Si, and altered the Si morphology from plate to semi-globular. Further addition of erbium (> 0.2 wt.%) did not alter the eutectic morphology and size. Moreover, the Al3Er phase was also observed in the eutectic region after modification. Out of the erbium contents used, 0.2 wt.% erbium showed the best influence on the tensile and wear properties. Compared with those of unmodified specimen, the values of ultimate tensile strength and elongation were enhanced by 31 and 39%, respectively through 0.2 wt. % erbium addition. Additionally, a remarkable enhancement in the wear properties was observed with the addition of 0.2

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铒改性Al-Si-Mg合金的组织-性能关系

研究了不同重量百分比(0 ~ 0.6 wt.%，间隔0.2)掺铒对铸态Al-7.5Si-0.5Mg合金组织特征、拉伸性能和磨损性能的影响。采用x射线衍射(XRD)、光学显微镜(OM)和扫描电镜(SEM)对试样的微观结构进行了表征。结果表明，铒的掺入降低了α-Al晶粒尺寸和共晶Si，使Si的形貌由板状变为半球状。进一步添加铒(> 0.2 wt.%)没有改变共晶的形貌和尺寸。此外，改性后的共晶区还出现了Al3Er相。在掺铒量中，掺铒量为0.2 wt.%对拉伸和磨损性能的影响最大。当掺铒量为0.2 wt. %时，试样的极限抗拉强度和伸长率分别提高了31%和39%。此外，当添加0.2时，耐磨性能显著增强

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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.