Interface Formation during Brazing of Dissimilar Materials Kovar to Ti and Mo

Maksymova, S.V.; Kovalchuk, P.V.; Voronov, V.V.

doi:10.1007/s11665-023-08187-8

J. of Materi Eng and Perform

2023

DOI: 10.1007/s11665-023-08187-8

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Interface Formation during Brazing of Dissimilar Materials Kovar to Ti and Mo

S.V. Maksymova

P.V. Kovalchuk

V.V. Voronov

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Cited by 2 publications

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Microstructural and Mechanical Characterizations of Mo/W and Mo/Graphite Joints with BNi2 Paste

Xu,

Cai,

Haider

et al. 2023

Adv Eng Mater

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Brazing of Mo to W and to graphite is achieved using BNi2 paste (containing Ni, Cr, Si, and B). For the Mo/W or Mo/graphite joint, the joining area consists of a diffusion area and a brazing area. The diffusion area is composed of MoNi and Mo, which is formed by diffusion of the Mo substrate into the braze during brazing. The brazing area of the Mo/W joint contains Ni(ss) (solid solution), Cr(ss), Ni3B, CrB, and Ni4W, while the brazing area of the Mo/graphite joint mainly comprises Ni(ss), MoNi, Ni3B, and CrB. A continuous chromium carbide layer is formed at the brazing area/graphite interface in the Mo/graphite joint due to the reaction of Cr in the BNi2 braze with the graphite. Nanoindentation measurements of the joints show that the diffusion area exhibits the highest hardness and elastic modulus in the joints. The shear strengths of the Mo/W and Mo/graphite joints are 58.1 ± 16.0 and 13.0 ± 4.0 MPa, respectively. The Mo/W and Mo/graphite joints fracture after the shear tests in the W and graphite sides, respectively, near the joining area, indicating that both fractures are caused by the stress concentration in the corresponding areas.

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Microstructural and Mechanical Characterizations of Mo/W and Mo/Graphite Joints with BNi2 Paste

Xu,

Cai,

Haider

et al. 2023

Adv Eng Mater

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Fatigue Fracture Mechanism and Life Prediction of TA1 Titanium Alloy Clinched Joints

Zhang,

Liao,

Wang

et al. 2024

Fatigue Fract Eng Mat Struct

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This study investigated the fatigue fracture mechanisms and life prediction of clinched joints made from titanium alloy TA1. The fatigue tests revealed that TA1 titanium alloy clinched joints exhibited failure characterized by fracture of the lower plate at three distinct fatigue load levels. Additionally, finite element analysis indicated that cold work hardening enhanced the fatigue performance of these joints. Observations of fracture surfaces using scanning electron microscopy identified the crack source and its propagation path, which correlated with the location of maximum principal stress from the finite element simulations. Fretting wear was also observed in this critical region. Furthermore, fatigue life predictions for TA1 titanium alloy clinched joints were made using Paris' law and the local strain approach. Both methods closely matched experimental results across different fatigue life intervals. Overall, the local strain approach exhibited superior predictive capability compared to Paris' law, taking into account various influencing factors.

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Interface Formation during Brazing of Dissimilar Materials Kovar to Ti and Mo

Cited by 2 publications

References 21 publications

Microstructural and Mechanical Characterizations of Mo/W and Mo/Graphite Joints with BNi2 Paste

Microstructural and Mechanical Characterizations of Mo/W and Mo/Graphite Joints with BNi2 Paste

Fatigue Fracture Mechanism and Life Prediction of TA1 Titanium Alloy Clinched Joints

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