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

被引：155

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

来源：

JOM | 2015年 / 67卷 / 10期

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

页码：2288 / 2295

页数：8

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