首页|High strength Al0.7CoCrFeNi2.4 hypereutectic high entropy alloy fabricated by laser powder bed fusion via triple-nanoprecipitation

High strength Al0.7CoCrFeNi2.4 hypereutectic high entropy alloy fabricated by laser powder bed fusion via triple-nanoprecipitation

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Eutectic high-entropy alloys,composed of FCC/B2 phases with a narrow solidification interval and excel-lent fluidity,have become a new hotspot in additive manufacturing.Nevertheless,their microstructures exhibit significant sensitivity to processing parameters,feedstocks,and composition,ultimately limiting the alloys'engineering applications.Here,a hypereutectic Ala.7CoCrFeNi2.4 alloy with a low cracking sus-ceptibility index was designed by Thermo-Calc calculation and fabricated by laser powder bed fusion.Results show that the as-printed Al0.7CoCrFeNi2.4 alloy manifests a stable cellular structure,coupled with appreciable ultimate tensile strength(≥1200 MPa)and ductility(≥20％)over a wide range of process-ing parameters.After aging at 800 ℃ for 30 min,outstanding strength(1500 MPa)and elongation(15％)were obtained.Considerable mechanical properties after aging stem from a triple strengthening mecha-nism,i.e.,L12 nanoprecipitates and rod-shaped B2 particles within the FCC matrix,along with Cr-enriched spherical nanoparticles in the B2 phase.Meanwhile,hierarchical structure,i.e.,FCC dominated matrix,a discontinuous B2 phase,a precipitation-free zone in the B2 phase,and a K-S orientation relationship be-tween FCC and B2,facilitate to maintain excellent plasticity.These results guide designing HEAs by AM with controllable microstructures and outstanding mechanical properties for industrial applications.

Laser powder bed fusionHypereutecticHigh entropy alloysNanoprecipitationStrengthening mechanism

Zhaowen Geng、Chao Chen、Miao Song、Jinru Luo、Jiaxuan Chen、Ruidi Li、Kechao Zhou

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Cent South Univ,State Key Lab Powder Met,Changsha,410083,China

Suzhou Laboratory,Suzhou,215004,China

Natural science foundation of ChinaNatural science foundation of ChinaNatural Science Foundation of Hunan Province,ChinaNatural Science Foundation of Hunan Province,ChinaKey R&D Program of Guangdong Province,ChinaTransformation and Industrialization Plan of Scientific and Technological Achievements of Hunan Province,ChinaNational Natural Science Foundation of Chinafunding from State Key Laboratory of Powder Metallurgy,Central South University and the Fundamental Research Funds for the C

52271046521710522022JJ200612023JJ306842019B0109430012020GK203152171052

2024

10.1016/j.jmst.2023.11.054

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.187(20)
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