Fatigue behavior of a wrought Al0.5CoCrCuFeNi two-phase high-entropy alloy

被引：359

作者：

Tang, Zhi ^{[1
,2
]}

Yuan, Tao ^{[3
]}

Tsai, Che-Wei ^{[4
]}

Yeh, Jien-Wei ^{[4
]}

Lundin, Carl D. ^{[1
]}

Liaw, Peter K. ^{[1
]}

机构：

[1] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[2] Virginia Tech, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA

[3] Ohio Univ, Dept Ind & Syst Engn, Athens, OH 45701 USA

[4] Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu 30013, Taiwan

来源：

ACTA MATERIALIA | 2015年 / 99卷

基金：

美国国家科学基金会;

关键词：

High-entropy alloys; Fatigue behavior; Deformation nanotwins; Statistical models; BULK METALLIC-GLASS; HIGH-CYCLE FATIGUE; MECHANICAL-PROPERTIES; DEFORMATION; TEMPERATURE; MICROSTRUCTURE; EVOLUTION; FREQUENCY; CURVES; SYSTEM;

D O I：

10.1016/j.actamat.2015.07.004

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Fatigue behavior of a cold-rolled two-phase Al0.5CoCrCuFeNi high-entropy alloy (HEA) was studied. Some specimens were fabricated, using commercial-purity raw materials, while others were manufactured with high-purity components. Scatter in the fatigue life of the commercial-purity samples was found in the stress vs. lifetime plot (S-N curve). However, the high-purity samples showed less scatter, and fatigue life is predictable using fatigue statistics. The fatigue property of the alloy is comparable with and may even outperform many commercial alloys. Fatigue cracking is promoted by shrinkage pores with a size of similar to 5 mu m, while mechanical nanotwinning was found to be the main deformation mechanism before crack-initiation and during crack propagation by transmission electron microscopy (TEM). Two orientations of dense nanotwins were found at the crack-initiation site, while less-dense nanotwins were found away from the crack initiation site. The nanotwinning behavior resulted in strengthening of the alloy and, consequently, high fatigue strength (383 +/- 71 MPa). Moreover, statistical models were applied to predict fatigue life, suggesting that using improved fabrication processes and/or high-purity raw materials may enhance the fatigue behavior and scatter by reducing the number of fabrication microcracks and pores in the test samples. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

引用

页码：247 / 258

页数：12

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