High Temperature Tensile Behavior of A356-TiB2/TiC in-situ Composites

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2020-03-10 DOI:10.22068/IJMSE.17.1.56

Ismail Kakaravada, A. Mahamani, V. Pandurangadu

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Abstract

In the present investigation, A356-TiB2/TiC composites with a various reinforcement ratios (0, 2.5, 5 and 7.5%) were synthesized through a K2TiF6-KBF4-Graphite (C) reaction system. Formation of TiB2 and TiC particulates and their distribution are confirmed by various characterization techniques. The tensile properties such as ultimate strength, yield strength, young’s modulus and percentage of elongation in addition to their failure behavior of were studied at ambiant and high temperatures (100, 200 and 3000C). The increment in the volume fraction of the composite raised the hardness and the enhancement of hardness was reported up to 49% at 7.5% reinforced composite due to the strengthening effect. The density and porosity of fabricated composites were investigated. The rise in the volume fraction of reinforcement phase decreased the density and increased the porosity of composite samples. Further, the ultimate strength, yield strength, young’s modulus declined with the rise in the temperature. Result analysis also illustrates that the 7.5% reinforced composite retained the ultimate strength up to 84.4% and the ductility was raised by 27% at 3000C. Yield strength and young’s modulus were also retained 74.31% and 71.09% respectively at the similar material and experimental conditions. The fracture surface analysis of the composites showed that, the ductile nature of failure appearance microscopically with the formation of fine dimples and voids on fracture surface at elevated temperatures. Cleavage facets and tear crumples observation indicated the brittle kind of failure at the ambient temperature. Findings from the experimental study provide the tensile behavior of the composites at the regular working temperature of the automobile engine piston.

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A356-TiB2/TiC原位复合材料的高温拉伸性能

本研究采用k2tif6 - kbf4 -石墨(C)反应体系合成了不同增强率(0、2.5、5和7.5%)的A356-TiB2/TiC复合材料。各种表征技术证实了TiB2和TiC颗粒的形成及其分布。研究了常温和高温(100,200和3000C)下材料的极限强度、屈服强度、杨氏模量和伸长率等拉伸性能及其破坏行为。复合材料体积分数的增加提高了硬度，在7.5%的强化作用下，复合材料的硬度提高了49%。研究了复合材料的密度和孔隙率。增强相体积分数的增加降低了复合材料的密度，增加了复合材料的孔隙率。随着温度的升高，材料的极限强度、屈服强度、杨氏模量均呈下降趋势。结果表明，在3000C时，7.5%增强复合材料的极限强度保持了84.4%，塑性提高了27%。在相同的材料和实验条件下，屈服强度和杨氏模量分别保持74.31%和71.09%。断口形貌分析表明，高温下复合材料断口形貌具有延性，断口表面形成细小的韧窝和空洞。解理面和撕裂皱褶在常温下为脆性破坏。实验研究结果提供了复合材料在汽车发动机活塞正常工作温度下的拉伸性能。

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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.