Enhanced strength-ductility synergy of amorphous oxide dispersion strengthened Cu-316L-Mo immiscible alloys fabricated by laser powder bed fusion
Abstract
Bulk immiscible alloys with enhanced mechanical properties face the challenge of achieving high tensile strength and proper ductility. To address this issue, nanoscale amorphous oxides were introduced into Cu-316L-Mo immiscible alloy fabricated by laser powder bed fusion (LPBF). These immiscible alloys are characterized by γ-Fe and Cr12Fe36Mo10 (χ) particles dispersed in ε-Cu matrix, with a large amount of nanoscale Cr-O amorphous oxides wrapped between γ-Fe and χ particles, which we called amorphous oxide dispersion strengthened (AODS) immiscible alloys. The formation mechanism of γ-Fe and χ particles is liquid phase separation (LPS) in Cu-Fe system, and the in-situ amorphous oxides is induced by preferential affinity of Cr/O elements and high cooling rate. Moreover, a simple heat treatment at 600 °C drives Fe-rich precipitates within ε-Cu matrix and Cu-rich precipitates within γ-Fe particles. As a result, the immiscible alloy after treatment exhibits high strength (∼897 MPa) with an enhanced elongation of ∼6.4 %. This is the first time that a large number of in-situ generated nanoscale amorphous oxides have been used to strengthen immiscible alloys in material manufacturing. According to the research in this paper, nanoscale amorphous oxides, in conjunction with nanoscale Fe-rich particles produced by liquid-phase separation, can provide a enhancing strength and ductility for Cu-Fe immiscible alloys. These result may offer a new strengthening method for all alloys with Cr-containing produced by additive manufacturing, that is, enhancing the strength and ductility of alloys by in-situ nanoscale amorphous oxides.
RAS ID
83443
Document Type
Journal Article
Date of Publication
10-1-2025
Volume
943
Funding Information
National Natural Science Foundation of China (92166112, 52373236, 52271132) / Natural Science Foundation of Guangdong Province (2024A1515010658) / Guangdong Province International Science and Technology Cooperation Project (2023A0505050103) / Guangxi Key Laboratory of Information Materials (231033-K) / Open Project Program of Wuhan National Laboratory for Optoelectronics (2021WNLOKF010) / Guangzhou Science and Technology Planning Project (2024A04J9966) / Guangdong Provincial Science and Technology Plan Project (2022A0505050043)
School
Centre for Advanced Materials and Manufacturing / School of Engineering
Copyright
subscription content
Publisher
Elsevier
Identifier
Lai Chang Zhang: https://orcid.org/0000-0003-0661-2051
Comments
Wen, C., Yang, H., Guo, B., Sun, D., Zhang, L., Lu, Y., & Zhou, S. (2025). Enhanced strength-ductility synergy of amorphous oxide dispersion strengthened Cu-316L-Mo immiscible alloys fabricated by laser powder bed fusion. Materials Science and Engineering A, 943, 148741. https://doi.org/10.1016/j.msea.2025.148741