Phase thermal stability and mechanical properties analyses of (Cr,Fe,V)-(Ta,W) multiple-based elemental system using a c
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Phase thermal stability and mechanical properties analyses of (Cr,Fe,V)–(Ta,W) multiple-based elemental system using a compositional gradient film Qiu-wei Xing 1), Jiang Ma 2), and Yong Zhang 1) 1) Beijing Advanced Innovation Center of Materials Genome Engineering, State Key Laboratory of Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China 2) Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China (Received: 29 October 2019; revised: 6 April 2020; accepted: 7 April 2020)
Abstract: High-entropy alloys (HEAs) generally possess complex component combinations and abnormal properties. The traditional methods of investigating these alloys are becoming increasingly inefficient because of the unpredictable phase transformation and the combination of many constituents. The development of compositionally complex materials such as HEAs requires high-throughput experimental methods, which involves preparing many samples in a short time. Here we apply the high-throughput method to investigate the phase evolution and mechanical properties of novel HEA film with the compositional gradient of (Cr,Fe,V)–(Ta,W). First, we deposited the compositional gradient film by co-sputtering. Second, the mechanical properties and thermal stability of the (Cr0.33Fe0.33V0.33)x(Ta0.5W0.5)100−x (x = 13–82) multiplebased-elemental (MBE) alloys were investigated. After the deposited wafer was annealed at 600°C for 0.5 h, the initial amorphous phase was transformed into a body-centered cubic (bcc) structure phase when x = 33. Oxides were observed on the film surface when x was 72 and 82. Finally, the highest hardness of as-deposited films was found when x = 18, and the maximum hardness of annealed films was found when x = 33. Keywords: high-throughput fabrication; hard coating; thermal resistance; mechanical property; phase stability; high-entropy alloys
1. Introduction Global warming, induced by carbon dioxide emission, threatens the lives of humans. Compared with fossil fuel, solar energy is an abundant and renewable resource in nature [1]. Solar–thermal technology is a generally applied approach to convert solar energy into electricity. In this approach, a concentrated solar power (CSP) system concentrates the sunlight to a solar collector, and then the obtained thermal energy heats water to generate electricity [2]. The solar–thermal conversion coating on the solar collector plays a vital role in improving the energy generation efficiency of the CSP. Because the temperature on the solar collector surface is often over 300°C, an ideal solar–thermal conversion coating should possess excellent thermal stability and mechanical property at elevated temperatures [3–4]. A series of novel alloys, including metal glass and high-entropy alloys (HEAs), have attracted much attention due to their exclusive structures and
