TY - JOUR
T1 - Growth behavior of a mechanically long fatigue crack in an FeCrNiMnCo high entropy alloy
T2 - A comparison with an austenitic stainless steel
AU - Mizumachi, Shunsuke
AU - Koyama, Motomichi
AU - Fukushima, Yoshihiro
AU - Tsuzaki, Kaneaki
N1 - Funding Information:
(JP16H06365 and JP17H04956) and the Japan Science and Technology Agency (JST) (grant number: 20100113) under the Industry-Academia Collaborative R&D Program.
Funding Information:
This work was financially supported by JSPS KAKENHI
Publisher Copyright:
© 2020 ISIJ
PY - 2020
Y1 - 2020
N2 - The fatigue crack growth characteristics of an Fe20Cr20Ni20Mn20Co high-entropy alloy (HEA) were investigated by ΔK increasing compact tension test in comparison with SUS316L. The fatigue crack growth rate of the HEA was lower than that of the SUS316L. The predominant crack growth path was the grain interior for both alloys. A difference was observed in the crack roughness; i.e., the fatigue crack growth path of the HEA was more distinctly deflected than that of the SUS316L. This indicates that roughness-induced crack closure is a key factor reducing the crack growth rate of the HEA. Another key factor is the noncrystallographic transgranular crack growth mechanism. The SUS316L exhibited crack growth via crack blunting/re-sharpening, while the HEA exhibited transgranular crack growth associated with dislocation substructure alignment.
AB - The fatigue crack growth characteristics of an Fe20Cr20Ni20Mn20Co high-entropy alloy (HEA) were investigated by ΔK increasing compact tension test in comparison with SUS316L. The fatigue crack growth rate of the HEA was lower than that of the SUS316L. The predominant crack growth path was the grain interior for both alloys. A difference was observed in the crack roughness; i.e., the fatigue crack growth path of the HEA was more distinctly deflected than that of the SUS316L. This indicates that roughness-induced crack closure is a key factor reducing the crack growth rate of the HEA. Another key factor is the noncrystallographic transgranular crack growth mechanism. The SUS316L exhibited crack growth via crack blunting/re-sharpening, while the HEA exhibited transgranular crack growth associated with dislocation substructure alignment.
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U2 - 10.2355/isijinternational.ISIJINT-2019-230
DO - 10.2355/isijinternational.ISIJINT-2019-230
M3 - Article
AN - SCOPUS:85078525279
SN - 0915-1559
VL - 60
SP - 175
EP - 181
JO - Transactions of the Iron and Steel Institute of Japan
JF - Transactions of the Iron and Steel Institute of Japan
IS - 1
ER -