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1 Zeszyty Naukowe. Mechanika / Politechnika Opolska

1 2011

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Simulation of diffusion bonding defects influence on low- cycle fatigue of nonhomogeneous structures

Temis J.M., Azmetov H.H., Timofeev D.S.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2011

z. 99

62-64

Diffusion bonding (DB) is a technological process providing the bond between different as well as similar materials without melting. The provided bond possesses characteristics up to 95...99% of the respective factors of the parent material. However, even the thoroughly carried out DB contains defects. Because of incorrect choice or coating of the stop-off material and fragile oxide phase unbonded areas, cleavages and microcracks can occur in the bond. Modeling of their formation and influence on DB characteristics meets various difficulties due to the dependence on DB conditions. There- fore the most widespread defect - microvoids, which formation depends on asperities of the bonding surfaces, is considered. Voids are determined as cavities (fig. 1a, b) in the bond plane, which contain neither oxides, nor stop- off. Because of the surface diffusion during DB, microvoids are rounded to nearly spherical form, so they could be approximated as spherical cavities.