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

被引:150
作者
Seifi, Mohsen [1 ]
Li, Dongyue [2 ]
Yong, Zhang [2 ]
Liaw, Peter K. [3 ]
Lewandowski, John J. [1 ]
机构
[1] Case Western Reserve Univ, Dept Mat Sci & Engn, Cleveland, OH 44106 USA
[2] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
[3] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
基金
美国国家科学基金会;
关键词
TEST TEMPERATURE; MECHANICAL-PROPERTIES; GRAIN-SIZE; MICROSTRUCTURES; ORIENTATION; ADDITIONS; ALUMINUM; STRESS; RATIO;
D O I
10.1007/s11837-015-1563-9
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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.
引用
收藏
页码:2288 / 2295
页数:8
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