|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||High Entropy Alloys IV
||Fracture Toughness and Fatigue Crack Growth Behavior of High Entropy Alloys
|| , Haoyan Diao, Peter K Liaw, John Lewandowski, Zhang Yong
|On-Site Speaker (Planned)
The fracture toughness and fatigue crack growth behavior of two as-vacuum arc cast high entropy alloys (Al0.2CrFeNiTi0.2 and AlCrFeNi2Cu) were determined. Microstructure examination of both HEA alloys revealed a two-phase structure consisting of bcc and 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.
||Planned: A print-only volume