Contact-reactive brazing mechanism of Al0.3CoCrFeNi high-entropy alloys using a niobium interlayer

IF 2.5 2区材料科学

Journal of Iron and Steel Research International Pub Date : 2024-08-28 DOI:10.1007/s42243-024-01314-2

Yu Lei, Yi-nan Li, Xiao-guo Song, Sheng-peng Hu, Wei-min Long, Hai-chuan Shi, Zu-bin Chen

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Abstract

The contact-reactive brazing of Al_0.3CoCrFeNi high-entropy alloys with a Nb interlayer was researched. The effects of Nb thickness and brazing temperature on the interfacial microstructure and mechanical properties of Al_0.3CoCrFeNi joints were investigated. The results show that with Nb thickness increasing from 10 to 100 μm, the average width of Al_0.3CoCrFeNi joints is increased from 127 to 492 μm and the erosion volume of Al_0.3CoCrFeNi base metals (BMs) by face-centered cubic-Nb eutectic liquid is enlarged accordingly. With increasing brazing temperature from 1280 to 1360 °C, the intergranular penetration of eutectic liquid into Al_0.3CoCrFeNi BMs becomes more severe and lamellar Laves phase is broken-up and spherized. The shear strength of joint is increased gradually from 374 to 486 MPa and then decreased to 475 MPa. The maximum shear strength value of 486 MPa is obtained when brazing at 1340 °C for 10 min, reaching about 78% of the shear strength of Al_0.3CoCrFeNi BMs. Besides, the brazing mechanism was analyzed in details.

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使用铌中间膜的 Al0.3CoCrFeNi 高熵合金的接触反应钎焊机理

研究了带有铌夹层的 Al0.3CoCrFeNi 高熵合金的接触反应钎焊。研究了铌厚度和钎焊温度对 Al0.3CoCrFeNi 接头界面微观结构和机械性能的影响。结果表明，随着 Nb 厚度从 10 μm 增加到 100 μm，Al0.3CoCrFeNi 接头的平均宽度从 127 μm 增加到 492 μm，面心立方 Nb 共晶液对 Al0.3CoCrFeNi 母材 (BM) 的侵蚀体积也相应增大。随着钎焊温度从 1280 ℃ 升至 1360 ℃，共晶液对 Al0.3CoCrFeNi 基体金属的晶间渗透变得更加严重，片状 Laves 相破碎并球化。接头的剪切强度从 374 MPa 逐渐升高到 486 MPa，然后又降低到 475 MPa。在 1340 °C 下钎焊 10 分钟时，获得的最大剪切强度值为 486 MPa，约为 Al0.3CoCrFeNi BMs 剪切强度的 78%。此外，还详细分析了钎焊机理。

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来源期刊

Journal of Iron and Steel Research International 工程技术-冶金工程

自引率

16.00%

发文量

161

审稿时长

2.8 months

期刊介绍： Publishes critically reviewed original research of archival significance Covers hydrometallurgy, pyrometallurgy, electrometallurgy, transport phenomena, process control, physical chemistry, solidification, mechanical working, solid state reactions, materials processing, and more Includes welding & joining, surface treatment, mathematical modeling, corrosion, wear and abrasion Journal of Iron and Steel Research International publishes original papers and occasional invited reviews on aspects of research and technology in the process metallurgy and metallic materials. Coverage emphasizes the relationships among the processing, structure and properties of metals, including advanced steel materials, superalloy, intermetallics, metallic functional materials, powder metallurgy, structural titanium alloy, composite steel materials, high entropy alloy, amorphous alloys, metallic nanomaterials, etc..