Improving Mechanical and Tribological Characteristics of Cast Elektron 21 Alloy by Reinforcing its Surface with Al0.3Cu0.3Ni0.1Si0.1W0.2 High Entropy Alloy via Friction Stir Processing Route

IF 2.6 3区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
R. Soundararajan, A. Sathishkumar, S. Sivasankaran, Abdullah Alhomidan
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Abstract

The primary objective of this investigation is to strengthen the mechanical and tribological properties of the cast Elektron 21 alloy (UNS M12310) by reinforcing its surface with a high entropy alloy (HEA) consisting of 0.3 wt% aluminum, 0.3 wt% copper, 0.1 wt% nickel, 0.1 wt% silicon, and 0.2 wt% tungsten fabricated by friction stir processing (FSP). The resulting Elektron 21/HEA surface composites (SCs) processed through casting followed by FSP were compared to the cast followed by FSPed Elektron 21 alloy, exhibiting significant enhancements in mechanical properties and wear resistance. The surface of the Elektron 21 matrix, which underwent casting followed by FSP, showed a homogeneous dispersion of HEA particles. These particles served as precipitates, creating geometrically necessary dislocations that hindered movement under applied force. The bonding between the HEA and the Elektron 21 alloy at the interface was excellent, and differential thermal contraction resulted in a strain misfit. Consequently, the microhardness, yield stress, and ultimate tensile stress of the FSPed Elektron 21/HEA SCs improved by 38%, 37%, and 32%, respectively, compared to the FSPed Elektron 21 alloy, although ductility decreased by 33%. Furthermore, the FSPed Elektron 21/HEA SCs showed a 33% enhancement in wear resistance and a 27% reduction in frictional force generation compared to the FSPed Elektron 21 alloy. The worn surfaces of the FSPed specimens showed that the FSPed Elektron 21 alloy revealed deep grooves, pits, micro-cutting, micro-grooving, and ploughing, while these features were absent in the FSPed Elektron 21/HEA SCs. These outcomes make it better suited for use in the aviation and automotive sectors.

Graphical Abstract

Abstract Image

通过摩擦搅拌加工工艺用 Al0.3Cu0.3Ni0.1Si0.1W0.2 高熵合金强化铸态 Elektron 21 合金表面,改善其机械和摩擦学特性
本研究的主要目的是通过使用高熵合金 (HEA) 强化铸造 Elektron 21 合金(UNS M12310)的表面,从而增强其机械性能和摩擦学性能。高熵合金由 0.3 wt% 的铝、0.3 wt% 的铜、0.1 wt% 的镍、0.1 wt% 的硅和 0.2 wt% 的钨组成,通过摩擦搅拌加工 (FSP) 制成。通过铸造后再进行 FSP 加工的 Elektron 21/HEA 表面复合材料 (SC) 与铸造后再进行 FSP 加工的 Elektron 21 合金进行了比较,结果表明两者的机械性能和耐磨性都有显著提高。经过铸造和 FSP 处理的 Elektron 21 基体表面显示出 HEA 颗粒的均匀分散。这些颗粒作为沉淀物,产生了几何上必要的位错,阻碍了在外力作用下的运动。HEA 与 Elektron 21 合金在界面上的结合非常好,不同的热收缩导致了应变错位。因此,与 FSPed Elektron 21 合金相比,FSPed Elektron 21/HEA SC 的显微硬度、屈服应力和极限拉伸应力分别提高了 38%、37% 和 32%,但延展性降低了 33%。此外,与 FSPed Elektron 21 合金相比,FSPed Elektron 21/HEA SC 的耐磨性提高了 33%,摩擦力降低了 27%。FSPed 试样的磨损表面显示,FSPed Elektron 21 合金出现了深沟、凹坑、微切削、微挖槽和犁沟,而 FSPed Elektron 21/HEA SCs 则没有这些特征。这些结果使其更适合用于航空和汽车领域。
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来源期刊
International Journal of Metalcasting
International Journal of Metalcasting 工程技术-冶金工程
CiteScore
4.20
自引率
42.30%
发文量
174
审稿时长
>12 weeks
期刊介绍: The International Journal of Metalcasting is dedicated to leading the transfer of research and technology for the global metalcasting industry. The quarterly publication keeps the latest developments in metalcasting research and technology in front of the scientific leaders in our global industry throughout the year. All papers published in the the journal are approved after a rigorous peer review process. The editorial peer review board represents three international metalcasting groups: academia (metalcasting professors), science and research (personnel from national labs, research and scientific institutions), and industry (leading technical personnel from metalcasting facilities).
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