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ABSTRACT
The fabrication of high-quality metallic powders has been attracted considerable attention in terms of producing advanced materials through additive manufacturing (AM) technology. The efficiency of AM products mainly dependent on the initial powder, therefore, characterisation of pre-alloyed powders become important. In this study, we explored the fabrication of Al0.5CoCrFeMnNi high-entropy alloy (HEA) powders by gas atomisation process and investigated their powder characteristics according to particle size distribution. X-ray diffraction results revealed the formation of major face-centred cubic and minor body-centred cubic phase by the addition of Al content. The detailed characterisations such as scanning electron microscopy, Auger electron spectroscopy and XPS analysis was carried out to examine the chemical composition of HEA powders. The relationship between secondary dendrite arm spacing and cooling rate was evaluated. The results demonstrated that produced alloy powders are spherical in shape with smooth surfaces, compositional homogeneity, indicating the gas-atomised powders are widely acceptable for additive manufacturing applications.
Acknowledgements
This work was supported by the Basic Research Laboratory Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (MOE) (No: 2019R1A4A1026125). Part of this research work was supported by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (No: 2018M3D1A1025730).
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Yeeun Lee
Yeeun Lee completed her bachelor degree in Advanced Materials Engineering, Kongju National University, Republic of Korea. Currently, she is studying Master's degree in Advanced Materials Engineering, Kongju National University, Republic of Korea. She has hugely interest in powder metallurgy, high entropy alloys and additive manufacturing process.
Cheenepalli Nagarjuna
Cheenepalli Nagarjuna completed his Master’s degree in Department of Physics at Sri Venkateswara University, Tirupati, India. Currently, he is studying PhD in Materials Science and Engineering, Kongju National University, South Korea. His major research interests in Powder Metallurgy include the fabrication of high entropy alloy powders by gas atomisation and mechanical alloying process, followed by sintering and investigate their microstructure and mechanical properties for structural applications.
Jun-Woo Song
Jun-Woo Song completed his PhD in Materials Science and Engineering, Kongju National University, South Korea. Currently, he is working as Postdoctoral researcher in Materials Science and Engineering, Kongju National University, South Korea. His major interests in powder metallurgy include the fabrication of various alloy powders by gas atomisation, high energy ball milling and consolidated by spark plasma sintering processes.
Kwang Yong Jeong
Kwang Yong Jeong completed his Master’s degree in Materials Science and Engineering, Kongju National University, South Korea. Currently, he is doing PhD in Materials Science and Engineering, Kongju National University, South Korea. His Major research interest in powder metallurgy, such as fabrication of metallic powders by gas or water atomisation and high energy ball milling process followed by various sintering techniques.
Gian Song
Professor Gian Song obtained his Ph.D in materials Science and Engineering at University of Tennessee, Knoxville, followed by worked as Post-Doctoral Research Associate at Oak-ridge national lab. Then, he finally joined the division of advanced materials engineering at Kongju national university. He has been focusing on the development of novel metallic materials with excellent mechanical properties and has published about 64 scientific papers in peer-reviewed international journals.
Jinkyu Lee
Professor Jinkyu Lee is working in Advanced Materials Engineering at Kongju National University. He received his PhD degree from the Department of Metallurgical Engineering, Yonsei University, Seoul, Korea, in 2002. He has pioneered research in bulk metallic glasses, nano structured materials and powder metallurgy, and has published more than 100 research papers in peer-reviewed international journals.
Jong-Hyeon Lee
Professor Jong-Hyeon Lee obtained his Ph.D in Metallurgical Engineering at Chungnam National University, Korea, followed by he worked as Senior Researcher at Korea Atomic Energy Research Institute. Currently, he is working in Department of Materials Science and Engineering at Chungnam National University, where he has been focusing on the development of novel electrochemical oxide reduction processes and published more than 180 scientific papers in peer-reviewed international journals.
Soon-Jik Hong
Professor Soon-Jik Hong is completed his PhD in Materials Science and Engineering in Chungnam National University, South Korea, followed by he worked as Post-Doctoral researcher in University of Central Florida, USA. Currently, he is working as professor in Materials Science and Engineering, Kongju National University, South Korea. His major research interests in Powder Metallurgy include the fabrication of various metal alloy powders by gas or water atomisation and mechanical alloying processes, followed by various sintering techniques, investigation of microstructure and mechanical properties. He has published more than 250 scientific papers in peer-reviewed international journals.