Vietnam Academy of Science and Technology

Project's information

Project's title	Development of high entropy alloys for next generation high temperature materials
Project’s code	QTKR01.02/19-20
Research hosting institution	Institute of Materials Science
Coordinating unit, co-chair	Korea Advanced Institute of Science and Technology (KAIST)
Project leader’s name	Prof. Nguyen Huy Dan and Prof. Soon Hyung Hong
Project duration	01/01/2019 - 31/12/2020
Project’s budget	200 million VND
Classify	Fair
Goal and objectives of the project	- Study on fabrication of the high-entropy alloys with higher thermal resistance than the Ni alloys. - To grasp the fabricated technique of alloys with working condition at high temperature, application for a nuber of defense industries. - Enhance research capacity of Institute of Materials Science through cooperation with KAIST, a leading research center in Korea.
Main results	The series of AlxNbCrMoV (x: 0; 0.1; 0.5 and 1) high-entropy alloys were fabricated by high-energy planetary ball milling with combination of sintered by hot isostatic pressing (HIP) technique using low carbon steel cans or spark plasma sintering (SPS). The fabricated HEA samples were indicated a body-center cubic single phase with the grain size in the range of 2.5 to 3.5 µm. As the Al content increases, the hardness and oxidation resistance of the samples increased. By hot isostatic pressing or spark plasma sintering techniques, the AlxNbCrMoV high entropy alloys have a real density close to the theoretical density.
Products of the project	- Publications: + 01 article published in the journal under ISI list: Byungchul Kang, Taeyeong Kong, Nguyen Huy Dan, Doan Dinh Phuong, Ho Jin Ryu, Soon Hyung Hong, Effect of boron addition on the microstructure and mechanical properties of refractory Al0.1CrNbVMo high-entropy alloy, International Journal of Refractory Metals and Hard Materials 100 (2021) 105636 (IF: 4,804). + 01 article published in domestic journal: Luong Van Duong, Nguyen Huy Dan, Doan Dinh Phuong, Nguyen Ngoc Linh, Dang Quoc Khanh, Effect of aluminum (Al) content on properties of high entropy alloy AlxNbCrMoV sintered by hot isostatic pressing, Journal Science and Technology of Metal, No. 101, April 2022, pages 2-8. - Patents: - Products (description...): + 01 technological process for manufacturing materials according to research contents. + 10 samples of thermal resistance HEA: Cr-Nb-V-Mo-Al (ϕ 10x5 mm) - Other products: + Participating in training for 01 master student.
Recommendations	From the research results obtained above, which is shown that high entropy materials have potential in practical applications. However, more research is needed, especially measurements at high temperatures to evaluate the heat resistance to guide practical applications. Therefore, the collective proposes to consider to be able to continue developing this research direction.
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