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Fracture Toughness and Fatigue Crack Growth Behavior of As-Cast High-Entropy Alloys

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Abstract

The fracture toughness and fatigue crack growth behavior of two as-vacuum arc cast high-entropy alloys (HEAs) (Al0.2CrFeNiTi0.2 and AlCrFeNi2Cu) were determined. A microstructure examination of both HEA alloys revealed a two-phase structure consisting of body-centered cubic (bcc) and face-centered cubic (fcc) phases. The notched and fatigue precracked toughness values were in the range of those reported in the literature for two-phase alloys but significantly less than recent reports on a single phase fcc-HEA that was deformation processed. Fatigue crack growth experiments revealed high fatigue thresholds that decreased significantly with an increase in load ratio, while Paris law slopes exhibited metallic-like behavior at low R with significant increases at high R. Fracture surface examinations revealed combinations of brittle and ductile/dimpled regions at overload, with some evidence of fatigue striations in the Paris law regime.

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Acknowledgements

This work was partially supported by the Arthur P. Armington Professorship (J.J.L.), while mechanical characterization was performed in the Advanced Manufacturing and Mechanical Reliability Center (AMMRC) at CWRU. ZY would like to thank the financial support of the National Science Foundation of China (Nos. 51471025 and 51210105006), 111 Project (B07003), and the Program for Changjiang Scholars and the Innovative Research Team of the University. PKL would like to acknowledge the support of the Department of Energy (DOE), Office of Fossil Energy, National Energy Technology Laboratory (DE-FE-0008855, DE-FE-0024054, and DE-FE-0011194), the Army Research Office (W911NF-13-1-0438), and the National Science Foundation (CMMI-1100080) with the program managers, Mr. V. Cedro, Mr. R. Dunst, Dr. J. Mullen, Dr. D.M. Stepp, and Dr. C. Cooper.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, OH, USA

    Mohsen Seifi & John J. Lewandowski

  2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology, Beijing, People’s Republic of China

    Dongyue Li & Zhang Yong

  3. Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN, USA

    Peter K. Liaw

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  1. Mohsen Seifi
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  2. Dongyue Li
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  3. Zhang Yong
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  4. Peter K. Liaw
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  5. John J. Lewandowski
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Correspondence to Mohsen Seifi.

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Seifi, M., Li, D., Yong, Z. et al. Fracture Toughness and Fatigue Crack Growth Behavior of As-Cast High-Entropy Alloys. JOM 67, 2288–2295 (2015). https://doi.org/10.1007/s11837-015-1563-9

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