TY - GEN
T1 - High temperature properties of advanced directionally-solidified high entropy superalloys
AU - Tsao, Te Kang
AU - Yeh, An Chou
AU - Yeh, Jien Wei
AU - Chiou, Mau Sheng
AU - Kuo, Chen Ming
AU - Murakami, H.
AU - Kakehi, Koji
N1 - Funding Information:
Authors would like to thank the financial support from Ministry of Science and Technology, Taiwan (R.O.C.), project grant number: 103-2221-E-214-035, 103-2218-E-007-019. Also authors would like to thank Dr. W.R. Wang of ITRI South for assistances in high temperature hardness tests. T.K. Tsao would like to thank the NTHU-NIMS cooperative graduate program for supporting his stay at NIMS.
PY - 2016
Y1 - 2016
N2 - High-Entropy-Superalloys (HESA) with good cost-performance has been proposed. In present work, the high temperature phase stability, oxidation, hot corrosion and mechanical properties of HESA alloys were studied. The microstructure of HESA is composed of stable FCC γ matrix and L12 γ′ precipitates, and both γ and γ′ phases are highly alloyed. This γ/γ′ microstructure can remain stable after long term exposure at inter-mediate to high temperatures. With respect to surface stability, HESAs show high Al and Cr activities to form either protective Al2O3 or Cr2O3 rapidly. With minor additions of refractory elements, the high temperature hardness of HESA can be higher than that of conventional superalloy. HESAs show comparable tensile strength and creep rupture properties comparing to that of commercial superalloys. Furthermore, their densities are below 8.0 g.cm-3, and the cost of raw materials can be 20 % cheaper than that of CM247LC. Therefore, the potential of HESAs for high temperature applications are revealed in present article.
AB - High-Entropy-Superalloys (HESA) with good cost-performance has been proposed. In present work, the high temperature phase stability, oxidation, hot corrosion and mechanical properties of HESA alloys were studied. The microstructure of HESA is composed of stable FCC γ matrix and L12 γ′ precipitates, and both γ and γ′ phases are highly alloyed. This γ/γ′ microstructure can remain stable after long term exposure at inter-mediate to high temperatures. With respect to surface stability, HESAs show high Al and Cr activities to form either protective Al2O3 or Cr2O3 rapidly. With minor additions of refractory elements, the high temperature hardness of HESA can be higher than that of conventional superalloy. HESAs show comparable tensile strength and creep rupture properties comparing to that of commercial superalloys. Furthermore, their densities are below 8.0 g.cm-3, and the cost of raw materials can be 20 % cheaper than that of CM247LC. Therefore, the potential of HESAs for high temperature applications are revealed in present article.
KW - Creep resistance
KW - Directional solidification
KW - Hardness
KW - High entropy superalloys
KW - Oxidation
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U2 - 10.1002/9781119075646.ch106
DO - 10.1002/9781119075646.ch106
M3 - Conference contribution
AN - SCOPUS:85008172796
T3 - Proceedings of the International Symposium on Superalloys
SP - 1001
EP - 1009
BT - SUPERALLOYS 2016 - Proceedings of the 13th International Symposium on Superalloys
A2 - Hardy, Mark
A2 - Huron, Eric
A2 - Glatzel, Uwe
A2 - Griffin, Brian
A2 - Lewis, Beth
A2 - Rae, Cathie
A2 - Seetharaman, Venkat
A2 - Tin, Sammy
PB - Minerals, Metals and Materials Society
T2 - 13th International Symposium on Superalloys, SUPERALLOYS 2016
Y2 - 11 September 2016 through 15 September 2016
ER -