TY - JOUR
T1 - Ultra-strong and ductile precipitation-strengthened high entropy alloy with 0.5 % Nb addition produced by laser additive manufacturing
AU - Zhang, Wei
AU - Chabok, Ali
AU - Wang, Hui
AU - Shen, Jiajia
AU - Oliveira, J. P.
AU - Feng, Shaochuan
AU - Schell, Nobert
AU - Kooi, Bart J.
AU - Pei, Yutao
N1 - Funding Information:
This research was carried out under project number S17024o in the framework of the Partnership Program of the Materials Innovation Institute M2i ( www.m2i.nl ) and the Netherlands Organization for Scientific Research ( www.nwo.nl ).
Funding Information:
WZ acknowledges the China Scholarship Council for her PhD grant (CSC No. 201906250212 ). YP acknowledges financial support by Samenwerkingsverband Noord-Nederland (SNN) within the program “3D Print Kompas”. JPO and JS acknowledge Fundação para a Ciência e a Tecnologia (FCT-MCTES) for its financial support via the project UID/00667/2020 (UNIDEMI). JPO acknowledges funding by national funds from FCT - Fundação para a Ciência e a Tecnologia, I.P., in the scope of the projects Nos. LA/P/0037/2020, UIDP/50025/2020, and UIDB/50025/2020 of the Associate Laboratory Institute of Nanostructures, Nanomodelling and Nanofabrication – i3N. JS acknowledges the China Scholarship Council for her PhD grant (CSC No. 201808320394). The authors acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for the provision of experimental facilities. Beamtime was allocated for proposal I-20210899 EC. The research leading to this result has been supported by the project CALIPSOplus under Grant Agreement 730872 from the EU Framework Programme for Research and Innovation HORIZON 2020. SF acknowledges financial support from the National Natural Science Foundation of China (No. 52105318 and 52311530340 ) and "Chunhui Plan" Collaborative Research Project of the Ministry of Education, China (HZKY20220023).
Funding Information:
WZ acknowledges the China Scholarship Council for her PhD grant (CSC No. 201906250212). YP acknowledges financial support by Samenwerkingsverband Noord-Nederland (SNN) within the program “3D Print Kompas”. JPO and JS acknowledge Fundação para a Ciência e a Tecnologia (FCT-MCTES) for its financial support via the project UID/00667/2020 (UNIDEMI). JPO acknowledges funding by national funds from FCT - Fundação para a Ciência e a Tecnologia, I.P. in the scope of the projects Nos. LA/P/0037/2020, UIDP/50025/2020, and UIDB/50025/2020 of the Associate Laboratory Institute of Nanostructures, Nanomodelling and Nanofabrication – i3N. JS acknowledges the China Scholarship Council for her PhD grant (CSC No. 201808320394). The authors acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for the provision of experimental facilities. Beamtime was allocated for proposal I-20210899 EC. The research leading to this result has been supported by the project CALIPSOplus under Grant Agreement 730872 from the EU Framework Programme for Research and Innovation HORIZON 2020. SF acknowledges financial support from the National Natural Science Foundation of China (No. 52105318 and 52311530340) and "Chunhui Plan" Collaborative Research Project of the Ministry of Education, China (HZKY20220023). This research was carried out under project number S17024o in the framework of the Partnership Program of the Materials Innovation Institute M2i (www.m2i.nl) and the Netherlands Organization for Scientific Research (www.nwo.nl).
Publisher Copyright:
© 2024
PY - 2024/7/10
Y1 - 2024/7/10
N2 - Achieving a superior strength-ductility combination for fcc single-phase high entropy alloys (HEAs) is challenging. The present work investigates the in-situ synthesis of Fe49.5Mn30Co10Cr10C0.5 interstitial solute-strengthened HEA containing 0.5 wt.% Nb (hereafter referred to as iHEA-Nb) using laser melting deposition (LMD), aiming at simultaneously activating multiple strengthening mechanisms. The effect of Nb addition on the microstructure evolution, mechanical properties, strengthening and deformation mechanisms of the as-deposited iHEA-Nb samples was comprehensively evaluated. Multiple levels of heterogeneity were observed in the LMD-deposited microstructure, including different grain sizes, cellular subgrain structures, various carbide precipitates, as well as elemental segregation. The incorporation of Nb atoms with a large radius leads to lattice distortion, reduces the average grain size, and increases the types and fractions of carbides, aiding in promoting solid solution strengthening, grain boundary strengthening, and precipitation strengthening. Tensile test results show that the Nb addition significantly increases the yield strength and ultimate tensile strength of the iHEA to 1140 and 1450 MPa, respectively, while maintaining the elongation over 30 %. Deformation twins were generated in the tensile deformed samples, contributing to the occurrence of twinning-induced plasticity. This outstanding combination of strength and ductility exceeds that for most additively manufactured HEAs reported to date, demonstrating that the present in situ alloying strategy could provide significant advantages for developing and tailoring microstructures and balancing the mechanical properties of HEAs while avoiding conventional complex thermomechanical treatments. In addition, single-crystal micropillar compression tests revealed that although the twining activity is reduced by the Nb addition to the iHEA, the micromechanical properties of grains with different orientations were significantly enhanced.
AB - Achieving a superior strength-ductility combination for fcc single-phase high entropy alloys (HEAs) is challenging. The present work investigates the in-situ synthesis of Fe49.5Mn30Co10Cr10C0.5 interstitial solute-strengthened HEA containing 0.5 wt.% Nb (hereafter referred to as iHEA-Nb) using laser melting deposition (LMD), aiming at simultaneously activating multiple strengthening mechanisms. The effect of Nb addition on the microstructure evolution, mechanical properties, strengthening and deformation mechanisms of the as-deposited iHEA-Nb samples was comprehensively evaluated. Multiple levels of heterogeneity were observed in the LMD-deposited microstructure, including different grain sizes, cellular subgrain structures, various carbide precipitates, as well as elemental segregation. The incorporation of Nb atoms with a large radius leads to lattice distortion, reduces the average grain size, and increases the types and fractions of carbides, aiding in promoting solid solution strengthening, grain boundary strengthening, and precipitation strengthening. Tensile test results show that the Nb addition significantly increases the yield strength and ultimate tensile strength of the iHEA to 1140 and 1450 MPa, respectively, while maintaining the elongation over 30 %. Deformation twins were generated in the tensile deformed samples, contributing to the occurrence of twinning-induced plasticity. This outstanding combination of strength and ductility exceeds that for most additively manufactured HEAs reported to date, demonstrating that the present in situ alloying strategy could provide significant advantages for developing and tailoring microstructures and balancing the mechanical properties of HEAs while avoiding conventional complex thermomechanical treatments. In addition, single-crystal micropillar compression tests revealed that although the twining activity is reduced by the Nb addition to the iHEA, the micromechanical properties of grains with different orientations were significantly enhanced.
KW - Deformation mechanism
KW - High entropy alloy
KW - In situ alloying
KW - Laser additive manufacturing
KW - Mechanical properties
KW - Precipitation strengthening
UR - http://www.scopus.com/inward/record.url?scp=85183458721&partnerID=8YFLogxK
U2 - 10.1016/j.jmst.2023.11.053
DO - 10.1016/j.jmst.2023.11.053
M3 - Article
AN - SCOPUS:85183458721
SN - 1005-0302
VL - 187
SP - 195
EP - 211
JO - Journal of Materials Science and Technology
JF - Journal of Materials Science and Technology
ER -