Small fatigue crack growth in a high entropy alloy

Kai Suzuki, Motomichi Koyama, Hiroshi Noguchi

Research output: Contribution to journalConference article

Abstract

High-entropy alloys (HEAs) contain a large amount of solid solution elements. This implies that the high capability of solid solution strengthening is expected to increase the resistance to fatigue crack growth. Therefore, we investigated the characteristics of microstructurally small fatigue crack growth of an HEA. In particular, we focused on microstructural fatigue crack growth behavior and associated scatter in crack growth rates. In this study, we used an equiatomic Fe-20Cr-20Ni-20Mn-20Co HEA and an Fe-18Cr-14Ni stable austenitic stainless steel. Rotating bending fatigue tests were performed at ambient temperature using smooth round bar specimens. The fatigue limits of the HEA and stainless steel were 250 and 200 MPa, respectively. The higher fatigue limit of the HEA was attributed to the solid solution strengthening. Furthermore, the scatter in crack growth rates of the HEA was more significant than that of the stainless steel owing to the temporal deceleration or non-propagation of the crack. In the stainless steel, as the crack length increased, the scatter in crack growth rates decreased. In contrast, in the HEA, even if the crack length increased, the scatter in crack growth rates remained significant As a factor that is perhaps related to the scatter characteristics, fatigue cracks with a length of approximately 500 μm in the HEA were highly deflected, compared to those of the stainless steel.

Original languageEnglish
Pages (from-to)1065-1070
Number of pages6
JournalProcedia Structural Integrity
Volume13
DOIs
Publication statusPublished - Jan 1 2018
Event22nd European Conference on Fracture, ECF 2018 - Belgrade, Serbia
Duration: Aug 25 2018Aug 26 2018

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Fatigue crack propagation
Entropy
Stainless Steel
Crack propagation
Stainless steel
Solid solutions
Fatigue of materials
Cracks
Strengthening (metal)
Deceleration
Alloy steel
Austenitic stainless steel

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Mechanics of Materials
  • Civil and Structural Engineering
  • Materials Science(all)

Cite this

Small fatigue crack growth in a high entropy alloy. / Suzuki, Kai; Koyama, Motomichi; Noguchi, Hiroshi.

In: Procedia Structural Integrity, Vol. 13, 01.01.2018, p. 1065-1070.

Research output: Contribution to journalConference article

Suzuki, Kai ; Koyama, Motomichi ; Noguchi, Hiroshi. / Small fatigue crack growth in a high entropy alloy. In: Procedia Structural Integrity. 2018 ; Vol. 13. pp. 1065-1070.
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