Synthesis of aluminium (Al) and alumina (Al2O3)-based graded material by gravity casting

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Puneet Singh, Krishna Kant Singh Mer, Satyendra Singh
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Abstract

In the present work, aluminium alloy-based composites were developed for automobile applications. Aluminium-based functionally graded material (FGM) was developed by adding 2.5, 5 and 7.5 wt% of nanoparticles of alumina. The composites were made using gravity casting in an open hearth furnace with the surface temperature of FGM maintained at 750, 850 and 1,000°C. The microstructure of the samples was studied using scanning electron microscopy and particle distribution. The particle distribution was higher at the bottom in all compositions, which can be attributed to more solidification time. As the wt% of the Al2O3 increased, the volume fraction of particles also increased from the top surface to the bottom surface of the samples. After adding 7.5 wt% of Al2O3 and heating up to 1,000°C led to the grain refinement of the alloy. The increase in hardness from the top surface to the bottom surface of the sample verified the development of FGM. Due to increase in the solidification temperature, better reinforcement was observed in the developed FGM.
通过重力铸造合成以铝(Al)和氧化铝(Al2O3)为基础的分级材料
在本研究中,开发了用于汽车的铝合金基复合材料。通过添加 2.5、5 和 7.5 wt%的纳米氧化铝颗粒,开发出了铝基功能分级材料(FGM)。复合材料是在露天炉中采用重力铸造法制成的,FGM 的表面温度分别保持在 750、850 和 1000°C。利用扫描电子显微镜和颗粒分布研究了样品的微观结构。在所有成分中,底部的颗粒分布较多,这可能是因为凝固时间较长。随着 Al2O3 wt% 的增加,颗粒的体积分数也从样品的顶部表面增加到底部表面。添加 7.5 wt% 的 Al2O3 并加热至 1,000°C 后,合金的晶粒细化。从样品顶面到底面的硬度增加验证了 FGM 的发展。由于凝固温度的升高,在形成的 FGM 中观察到了更好的强化。
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来源期刊
Accounts of Chemical Research
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.
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