Enhanced Mechanical, Tribological, and Thermal Properties of Fe 3 Al Composites with Carbon Nanotubes
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JMEPEG https://doi.org/10.1007/s11665-019-04023-0
Enhanced Mechanical, Tribological, and Thermal Properties of Fe3Al Composites with Carbon Nanotubes Yuan Yao, Cansen Liu, Xiaohua Jie, and Yongjin Mai (Submitted October 29, 2018; in revised form March 29, 2019) In this work, Fe3Al-based composites reinforced with carbon nanotubes were fabricated by a hot-press sintering process under various sintering pressures. The effects of sintering pressure and additives (alumina and lanthanum) on both the physical and the mechanical properties were systematically investigated. Results showed that with the sintering pressure of 15 MPa and incorporation of carbon nanotubes (CNTs), the microhardness of Fe3Al composite exhibited a peak value at 1038.1 HV, which was 60% higher than those without the addition of carbon nanotubes (644.9 HV). Also, both the compressive yield strength and the thermal conductivity of Fe3Al composite were also significantly improved. Results of wear test showed the Fe3Al composite exhibited a low wearing rate (1026-1025 order of magnitude) and a friction coefficient (0.53-0.67). Keywords
carbon nanotubes, Fe3Al-based composite, microstructure, wear
1. Introduction Iron aluminide (Fe3Al) has attracted considerable attentions as a potential candidate for wear component applications due to its advantages of low cost, high mechanical strength, excellent oxidation, and good resistance to wear and corrosion (Ref 1-3). Nevertheless, Fe3Al exhibits poor ductility and low mechanical strength at temperatures below 600 °C (Ref 4), which limits their wide applications as engineering materials for tribological components. In recent years, there have been increased interests in the fabrication and processing of intermetallic compounds through the ways of mechanical alloying and the addition of second-phase hard particles as reinforcement to improve the mechanical, tribological, and electrochemical properties of Fe3Al-based materials (Ref 5-9). There are generally two approaches to improve the wear resistance of the reinforced composites. One is to add wear-resistant hard phases. Cheng et al. (Ref 10) reported that the mechanical and tribological properties of Fe3Al-based composites reinforced by W0.5Al0.5C0.5 particulates were significantly improved. Amiriyan et al. (Ref 11) also demonstrated that the Fe3Al-TiC composite coatings exhibited much higher hardness, elastic modulus along with nearly three orders of magnitude higher wear resistance as compared to the Fe3Al alone coatings. The alumina (Al2O3), as a ceramic wearing-resistant phase, has unique properties such as high hardness, high oxidation, wear, and corrosion resistance with excellent thermal stability. Besides, there is good physical and chemical compatibility between Fe3Al and Al2O3. Therefore, numerous researches Yuan Yao, Cansen Liu, Xiaohua Jie, and Yongjin Mai, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, Peoples Republic of China. Contact e-mails: [email protected], [email protected] and [email protected].
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