Strong yet ductile nanolamellar high-entropy alloys by additive manufacturing

Ren, Jie; Zhang, Yin; Zhao, Dexin; Chen, Yan; Guan, Shuai; Liu, Yanfang; Liu, Liang; Peng, Siyuan; Kong, Fanyue; Poplawsky, Jonathan D.; Gao, Guanhui; Voisin, Thomas; An, Ke; Wang, Y. Morris; Xie, Kelvin Y.; Zhu, Ting; Chen, Wen

doi:10.1038/s41586-022-04914-8

Strong yet ductile nanolamellar high-entropy alloys by additive manufacturing

Journal Article · Wed Aug 03 00:00:00 EDT 2022 · Nature (London)

DOI:https://doi.org/10.1038/s41586-022-04914-8· OSTI ID:1885250

^[1]; Zhang, Yin ^[2]; Zhao, Dexin ^[3]; ^[4]; Guan, Shuai ^[1]; Liu, Yanfang ^[1]; Liu, Liang ^[1]; Peng, Siyuan ^[1]; Kong, Fanyue ^[1]; ^[4]; Gao, Guanhui ^[5]; ^[6]; ^[4]; ^[7]; Xie, Kelvin Y. ^[3]; ^[2]; ^[1]

Univ. of Massachusetts, Amherst, MA (United States)
Georgia Institute of Technology, Atlanta, GA (United States)
Texas A & M Univ., College Station, TX (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Rice Univ., Houston, TX (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of California, Los Angeles, CA (United States)

Additive manufacturing produces net-shaped components layer by layer for engineering applications. The additive manufacture of metal alloys by laser powder bed fusion (L-PBF) involves large temperature gradients and rapid cooling, which enables microstructural refinement at the nanoscale to achieve high strength. However, high-strength nanostructured alloys produced by laser additive manufacturing often have limited ductility. In this work, we use L-PBF to print dual-phase nanolamellar high-entropy alloys (HEAs) of AlCoCrFeNi_2.1 that exhibit a combination of a high yield strength of about 1.3 gigapascals and a large uniform elongation of about 14 percent, which surpasses those of other state-of-the-art additively manufactured metal alloys. The high yield strength stems from the strong strengthening effects of the dual-phase structures that consist of alternating face-centred cubic and body-centred cubic nanolamellae; the body-centred cubic nanolamellae exhibit higher strengths and higher hardening rates than the face-centred cubic nanolamellae. The large tensile ductility arises owing to the high work-hardening capability of the as-printed hierarchical microstructures in the form of dual-phase nanolamellae embedded in microscale eutectic colonies, which have nearly random orientations to promote isotropic mechanical properties. The mechanistic insights into the deformation behaviour of additively manufactured HEAs have broad implications for the development of hierarchical, dual- and multi-phase, nanostructured alloys with exceptional mechanical properties.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357; AC05-00OR22725; AC52-07NA27344

OSTI ID:: 1885250

Alternate ID(s):: OSTI ID: 1892141
OSTI ID: 1900733

Report Number(s):: LLNL-JRNL-841180

Journal Information:: Nature (London), Journal Name: Nature (London) Journal Issue: 7921 Vol. 608; ISSN 0028-0836

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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