文献类型：期刊文献

英文题名：Interfacial evolution and toughening mechanisms in diffusion-bonded Nb/Nb5Si3 laminated composites

作者：Peng, Yu[1,2];Shi, Junmiao[3];Peng, Xuan[2];Jiang, Nan[4];Xiong, Jiangtao[2];Li, Jinglong[1,2]

机构：[1]Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China;[2]Northwestern Polytech Univ, Shaanxi Key Lab Frict Welding Technol, Xian 710072, Peoples R China;[3]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[4]Xian Tyrida Opt Elect Technol Co Ltd, Xian 710072, Peoples R China

年份：2025

卷号：258

外文期刊名：MATERIALS & DESIGN

收录：;EI(收录号：20253519063113);WOS:【SCI-EXPANDED(收录号:WOS:001562840600001)】；

基金：This work was supported by the National Natural Science Foundation of China (Grant No. 52375146) and the platform of Shaanxi Province Rare Metal Equipment Manufacturing Common Technology Research and Development Platform of China (Platform No. 2024ZG-GXPT-02). The authors declare they have no conflict of interest.

语种：英文

外文关键词：Diffusion bonding; Nb/Nb 5 Si 3; Lamination composites; Fracture toughness; Crack propagation; Fracture morphology

摘要：Laminated Nb/Nb5Si3 composites were fabricated via diffusion bonding to investigate interfacial evolution and its impact on mechanical properties. The effects of bonding pressure and holding time on interfacial microstructure and fracture behavior were systematically studied. Increasing the bonding pressure from 20 MPa to 50 MPa improved atomic interdiffusion, eliminated voids, and raised the bonded ratio from 74.4 % to 96.4 %. Prolonged holding time promoted the removal of the NbSi2 phase and the formation of a continuous Nb5Si3 layer, contributing to a more ideal laminated structure. Mechanical testing demonstrated that enhanced interfacial integrity led to improvements in tensile strength (450 MPa), bending strength (1040 MPa), and fracture toughness (21.94 MPa & sdot;m1/2) under optimal conditions (1170 degrees C, 50 MPa, 4 h). Fracture analysis revealed a mixed ductile-cleavage mode dominated by interlaminar failure. Two main bending fracture behaviors were observed: interlayer delamination and translaminar crack growth. The improved toughness was attributed to extrinsic toughening through crack deflection along interfaces and intrinsic toughening via crack blunting within the Nb5Si3 layer. This study highlights the key role of interfacial phase control in achieving damage-tolerant, highperformance laminated composites and provides guidance for the design of high-temperature structural inter-metallic systems.