Novel NiAl-strengthened high entropy alloys with balanced tensile strength and ductility

Diao, Haoyan; Ma, Dong; Feng, Rui; Liu, Tingkun; Pu, Chao; Zhang, Chuan; Guo, Wei; Poplawsky, Jonathan D.; Gao, Yanfei; Liaw, Peter K.

doi:10.1016/j.msea.2018.11.055

Title: Novel NiAl-strengthened high entropy alloys with balanced tensile strength and ductility

Journal Article · Tue Nov 13 00:00:00 EST 2018 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2018.11.055· OSTI ID:1560511

Diao, Haoyan ^[1];

^[2];

^[1]; Liu, Tingkun ^[1]; Pu, Chao ^[1]; Zhang, Chuan ^[3];

^[2];

^[2]; Gao, Yanfei ^[1];

^[1]

Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
CompuTherm LLC, Middleton, WI (United States)

A single phase, face-centered-cubic (FCC) Al_0.3CoCrFeNi high entropy alloy usually has low yield strength. Here, a precipitate-strengthened Al_0.3CoCrFeNi has been developed, exhibiting enhanced yield strength while retaining good ductility, which is attributed to a novel microstructure comprising a finely distributed, needle-like B2 phase within the grains of the FCC matrix and a granular σ phase along the grain boundaries. Such a microstructure was obtained by a two-step heat treatment of an as-cast Al_0.3CoCrFeNi, whose parameters were determined by integrating CALPHAD-based thermodynamic calculations with microstructural characterization by atom probe tomography. In situ neutron diffraction, in conjunction with crystal-plasticity finite-element simulations, has revealed the strengthening effect owing to the load partitioning between the constituent phases. Here, this work has important implications for understanding phase stability and deformation mechanisms in multi-principal component alloys, and paves the way for developing novel microstructures in complex alloys using correlative techniques.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1560511

Alternate ID(s):: OSTI ID: 1636591

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Vol. 742, Issue C; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 35 works

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36 MATERIALS SCIENCE
High entropy alloys
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In situ neutron diffraction
Thermodynamic calculations

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