Conclusions
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1.
In composite material of the Al-B system spherical inclusions of AlB2 are formed on the surface of the filaments at points where the protective film of Al2O3 on the aluminum foil is destroyed.
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2.
Inclusions of AlB2 greatly reduce the strength of the filaments and also weaken the bond with the matrix.
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3.
At all diffusion welding temperatures there is a certain period of time (incubation period) in which no AlB2 is formed.
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4.
The duration of the incubation period does not depend on the pressure during diffusion welding, while the rate at which AlB2 is formed in the following period depends to a considerable extent on the pressure.
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5.
The processes occurring in the incubation period are diffusional in character and evidently associated with destruction and coalescence of the oxide film; the presence of oxygen (pressing in air or use of previously oxidized boron filaments) accelerates the process of coalescence.
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Literature cited
L. Broutman and R. Krock, Composite Materials, Vol. 1, Interfaces in Metal-Matrix Composites, Academic Press, New York-London (1974).
S. D. Gertsriken, Diffusion in Metals and Alloys [in Russian], Fizmatgiz, Moscow (1960).
A. Brock and H. Pryor, Corros. Sci.,13, No. 3, 199 (1973).
S. Z. Bokshtein et al., Filament Reinforced and Dispersion Hardened Composite Materials [in Russian], Nauka, Moscow (1976), p. 44.
Additional information
All-Union Institute of Aviation Materials. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 10, pp. 42–44, Ocober, 1978.
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Salibekov, S.E., Sakharov, V.V. & Romanovich, I.V. The early stages of the interaction of boron filaments with aluminum. Met Sci Heat Treat 20, 830–833 (1978). https://doi.org/10.1007/BF00703782
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DOI: https://doi.org/10.1007/BF00703782