Interfacial Microstructure Evolution and Mechanical Properties of TC4/MgAl2O4 Joints Brazed with Ti–Zr–Cu–Ni Filler Metal

IF 2.9 2区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Acta Metallurgica Sinica-English Letters Pub Date : 2024-09-13 DOI:10.1007/s40195-024-01761-6

Jiafen Song, Wei Guo, Shiming Xu, Ding Hao, Yajie Du, Jiangtao Xiong, Jinglong Li

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Abstract

In the present study, Ti–Zr–Cu–Ni amorphous filler metal was used to braze MgAl₂O₄ ceramic and Ti–6Al–4V (TC4) at 875, 900, 925, 950, 975 and 1000 °C for 10 min. The effects of brazing temperature on interfacial microstructure and mechanical properties of the joints were analyzed. The results showed that typical microstructure of the TC4/MgAl₂O₄ joint was solid solution (SS) α-Ti, acicular α-Ti + (Ti, Zr)₂(Ni, Cu) layer, metallic glasses and TiO. With the increase in brazing temperature, (Ti, Zr)₂(Ni, Cu) layer gradually dispersed at bonding interface, a continuous layer of TiO appears near MgAl₂O₄ ceramic. With the increase in brazing temperature, the hard and brittle (Ti, Zr)₂(Ni, Cu) layer gradually dispersed, resulting in the maximum shear strength of 39.5 MPa. The high-resolution TEM revealed the presence of amorphous structure, which is composed of Ti, Zr, Cu, Ni and Al. The values of δ and ΔH_mix are calculated to be about 8% and −39.82 kJ/mol for the amorphous phase.

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用 Ti-Zr-Cu-Ni 填充金属钎焊 TC4/MgAl2O4 接头的界面微观结构演变和力学性能

在本研究中，使用 Ti-Zr-Cu-Ni 无定形填料金属在 875、900、925、950、975 和 1000 °C 下钎焊 MgAl2O4 陶瓷和 Ti-6Al-4V (TC4) 10 分钟。分析了钎焊温度对接头界面微观结构和机械性能的影响。结果表明，TC4/MgAl2O4 接头的典型微观结构为固溶体 (SS) α-Ti、针状 α-Ti + (Ti, Zr)2(Ni, Cu) 层、金属玻璃和 TiO。随着钎焊温度的升高，（Ti，Zr）2（Ni，Cu）层在结合界面逐渐分散，在 MgAl2O4 陶瓷附近出现了连续的 TiO 层。随着钎焊温度的升高，硬脆的（Ti、Zr）2（Ni、Cu）层逐渐分散，使最大剪切强度达到 39.5 MPa。高分辨率 TEM 显示了由 Ti、Zr、Cu、Ni 和 Al 组成的无定形结构。经计算，非晶相的δ 和 ΔHmix 值分别约为 8% 和 -39.82 kJ/mol。

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来源期刊

Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

6.60

自引率

14.30%

发文量

122

审稿时长

2 months

期刊介绍： This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.