High-entropy Al0.3CoCrFeNi alloy fibers with high tensile strength and ductility at ambient and cryogenic temperatures

Li, Dongyue; Li, Chengxin; Feng, Tao; Zhang, Yidong; Sha, Gang; Lewandowski, John J.; Liaw, Peter K.; Zhang, Yong

doi:10.1016/j.actamat.2016.10.038

Title: High-entropy Al_0.3CoCrFeNi alloy fibers with high tensile strength and ductility at ambient and cryogenic temperatures

Journal Article · Sat Oct 29 00:00:00 EDT 2016 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2016.10.038· OSTI ID:1533455

Li, Dongyue ^[1]; Li, Chengxin ^[1]; Feng, Tao ^[2]; Zhang, Yidong ^[2]; Sha, Gang ^[2]; Lewandowski, John J. ^[3]; Liaw, Peter K. ^[4];

^[1]

Univ. of Science and Technology Beijing (China). State Key Lab. for Advanced Metals and Materials
Nanjing Univ. of Science and Technology (China). Herbert Gleiter Inst. of Nanoscience
Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Materials Science and Engineering
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering

High-entropy alloys (HEAs) are multi-component systems based on novel alloy composition designs with entropy maximization. They feature an array of unique mechanical properties when compared with traditional alloys. In this study, HEA fibers with diameters ranging from 1 to 3.15 mm in diameter, with the composition of Al_0.3CoCrFeNi (atomic percent, at.%), were successfully fabricated by hot-drawing, followed by microstructural characterization using scanning-electron microscopy (SEM) and transmission-electron microscopy (TEM). The compositional variations within and between fibers were determined using energy-dispersive X-ray spectroscopy in TEM along with atomic-probe tomography (APT). These analyses revealed a homogeneous face-centered cubic (FCC) structure in the as-cast material, while post processing (e.g., forging and wire drawing) produced nanosized B2 particles in an FCC matrix. Electron back-scatter diffraction (EBSD) was used to determine the evolution of the texture and grain boundary character after processing of the fibers. The tensile strength and plasticity of the fibers were determined at both 298 K (1207 MPa/7.8%) and 77 K (1600 MPa/17.5%). Detailed TEM analyses revealed that the improvement of mechanical properties at 77 K (i.e. increased strength and ductility) is due to a change in deformation mechanisms from the planar slip of dislocations to nano-twinning. Such properties could be beneficial for cryogenic applications.

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Research Organization:: Univ. of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0008855; FE0011194; FE0024054

OSTI ID:: 1533455

Alternate ID(s):: OSTI ID: 1398622

Journal Information:: Acta Materialia, Vol. 123; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 334 works

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high-entropy alloy
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Title: High-entropy Al0.3CoCrFeNi alloy fibers with high tensile strength and ductility at ambient and cryogenic temperatures

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Title: High-entropy Al_0.3CoCrFeNi alloy fibers with high tensile strength and ductility at ambient and cryogenic temperatures