Authors: Mohsen Seifi Dongyue Li Zhang Yong Peter K Liaw John J Lewandowski
Publish Date: 2015/08/26
Volume: 67, Issue: 10, Pages: 2288-2295
Abstract
The fracture toughness and fatigue crack growth behavior of two asvacuum arc cast highentropy alloys HEAs Al02CrFeNiTi02 and AlCrFeNi2Cu were determined A microstructure examination of both HEA alloys revealed a twophase structure consisting of bodycentered cubic bcc and facecentered cubic fcc phases The notched and fatigue precracked toughness values were in the range of those reported in the literature for twophase alloys but significantly less than recent reports on a single phase fccHEA 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 metalliclike 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 regimeThis work was partially supported by the Arthur P Armington Professorship JJL 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 DEFE0008855 DEFE0024054 and DEFE0011194 the Army Research Office W911NF1310438 and the National Science Foundation CMMI1100080 with the program managers Mr V Cedro Mr R Dunst Dr J Mullen Dr DM Stepp and Dr C Cooper
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