文献类型：期刊文献

英文题名：Multi-material laser powder bed fusion additive manufacturing of dual-phase laminated heterostructure of Cantor high-entropy alloy and Martensitic steel for overcoming strength-ductility trade-off

作者：Huang, Guoqing[1,2];Li, Bo[1,2,3];Zhang, Jianrui[1,2];Xuan, Fuzhen[1,3]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai, Peoples R China;[2]East China Univ Sci & Technol, Addit Mfg & Intelligent Equipment Res Inst, Shanghai, Peoples R China;[3]Shanghai Collaborat Innovat Ctr Biomfg, Shanghai 200237, Peoples R China

年份：2025

卷号：97

外文期刊名：ADDITIVE MANUFACTURING

收录：;EI(收录号：20245217585208);WOS:【SCI-EXPANDED(收录号:WOS:001396277400001)】；

基金：This research work is sponsored by the National Natural Science Foundation of China (Grant No. 52175140), Science Fund for Creative Research Groups of the National Natural Science Foundation of China (Grant No. 52321002), AECC Industry-University-Research Cooperation Project (Grant No. HFZL2023CXY024), and Research Project of Shanghai Municipal Administration for Market Regulation (Grant No. 2023-46).

语种：英文

外文关键词：Multi-material laser powder bed fusion; Laminate; Heterogeneous structure; Strength-plasticity synergy; Dual-phase

摘要：Overcoming the trade-off between the strength and ductility of metallic materials is an essential path to expanding their development and application limits. Inspired by the concept of heterostructured materials, a dual-phase laminated heterogeneous structure of Cantor high-entropy alloy and 18Ni300 maraging steel, with sub-millimeter layer thicknesses, was fabricated via a multi-material laser powder bed fusion (MM-LPBF) technique. Under the premise of similar major chemical composition element types, in the laminate, the face-centered cubic (FCC) crystal structure layer thickness with the coarsened grains was similar to 300 mu m, while the body-centered cubic (BCC) crystal structure layer thickness with the fine grains was less than 100 mu m, and the FCC-BCC laminate interfaces were well-transitioned. The dual-alloy laminate with dual phase exhibited a good combination of tensile strength and ductility whether in the direction parallel to the layering (Ultimate tensile strength (UTS): 788 MPa and Elongation (EI): 30.4 %) or perpendicular to it (UTS: 709 MPa and EI: 33.0 %), according to mechanical tensile tests considering the anisotropy issue of the laminate materials. The heterodeformation-induced (HDI) plasticity induced simultaneous increase in both strength and ductility of the laminates. The non-uniform strain gradient within the heterostructure enhanced the synergistic mechanisms of dislocation slip and deformation twinning, conferring benefits in terms of strengthening and toughening. HDI back-stress strengthening mechanism increased the strength, inhibiting crack propagation and suppressing the plastic instability of the dual-phase laminate material. Upon heat treatment, accompanied by the interdiffusion of composition elements at the dual-phase laminated interfaces, the FCC-BCC phase proportion and the dual-phase layer thickness ratio had undergone alterations, leading to an increase in the thickness of the FCC layers and a decrease in the thickness of the BCC layers, thereby enhancing the ductility of the laminate. This multi-material metal additive manufacturing approach essentially creates new alloy systems with a superior comprehensive performance.