文献类型：期刊文献

英文题名：Phase diagram-guided composition design and property investigation of Ni-based filler metals

作者：Liao, Pengpeng[1];Zhou, Guo-Yan[1];Zhang, Kun[1];Ma, Hanyang[1];Duan, Pengyang[1];Zhang, Cheng-Cheng[2];Zhang, Xian-Cheng[1];Tu, Shan-Tung[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressurized Syst & Safety, MOE, Shanghai 200237, Peoples R China;[2]AECC Commercial Aircraft Engine Co Ltd, Shanghai Engn Res Ctr Commercial Aircraft Engine, Shanghai 201108, Peoples R China

年份：2024

卷号：891

外文期刊名：MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

收录：;EI(收录号：20234915172991);WOS:【SCI-EXPANDED(收录号:WOS:001131915700001)】；

基金：The work was supported by National Natural Science Foundation of China (No. 52130511) and Shanghai Gaofeng Project for University Academic Program Development. The authors are also grateful for the Innovation Program of Shanghai Municipal Education Commission (2019-01-07-00-02-E00068) and the Innovation Program Phase II of AECC Commercial Aircraft Engine Co. Ltd (Grant No. HT-3RJC1053-2020).

语种：英文

外文关键词：Brazing filler; BNi-2; Wettability; Thermophysical properties; Creep properties; Thermodynamic simulation

摘要：The fundamental mechanism underlying the formation of brazed joints involves the diffusion of elements between the base metal (BM) and the brazing filler metal (FM). The formation of brittle compounds in FM during the brazing process frequently results in a significant deterioration of the mechanical properties of the brazed joints. Ni and Cu elements exhibit infinite solubility, and the incorporation of Cu element results in a decrease in the liquidus temperature of FM, thereby enhancing its surface wettability on the BM. The present investigation involves the preparation of as-cast and amorphous FMs with varying Cu element concentrations to examine their material properties, such as weldability, wettability, thermophysical behavior, and creep resistance. The thermophysical and mechanical properties of the nickel-based filler metal BNi-2 were evaluated using the JMatPro software for material thermodynamic simulation and compared with data obtained from existing literatures. An analysis is conducted on the creep properties of a novel FM comprising of Ni, Cr, Fe, Si, B, and Cu. The results suggest that the thermophysical properties of BNi-2 filler are minimally impacted by the presence of Cr (6-8 wt %), Fe (2.5-3.5 wt%), Si (4-5 wt%), and B (2.75-3.5 wt%). Furthermore, alterations in the composition of Si and B elements have a significant impact on the distribution of gamma and gamma ' phases, consequently influencing the creep properties of the material. At 25 degrees C, the equilibrium phase of BNi-2 with different Cu contents indicates a gradual decrease in the content of gamma phase, while the content of gamma ' and Cu-Ni phases increases with an increase in Cu content. The BNi-2 filler with 3 % Cu exhibits the most favorable properties in terms of steady creep rate and fracture life compared to other fillers. This is attributed to the competitive equilibrium between the gamma phase and Cu-Ni phase. The addition of 6 % Cu element results in the optimal wettability of the filler metal and creep resistance of the brazed joints. It is also observed that as the concentration of Cu reaches 9 %, there is a gradual increase in the FeB phase, a rise in the proportion of brittle compounds, and a decline in the amorphous forming ability.