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ABSTRACT:The study presents investigation of chemical composition, microhardness and electrical conductivity of Cu/Al laminated metal composite after heat treatment at temperatures higher than Cu-Al eutectic melting point. The Cu/Al bimetal was obtained via explosion welding. Chemical composition of the material after heat treatments was identified using EDS analysis. Eddy current testing was applied to investigate electrical conductivity of the composite's components. Strain-hardened zones were identified in the explosion welded composite. The experimental value of electrical conductivity of explosion welded composite was in good coherence with calculated by additivity rule results. Heat treatments resulted in the formation of multiple interlayers which had high microhardness value and had intermetallics in composition. The electrical conductivity of the identified interlayers was significantly lower than of Cu and Al. RESUMEN:Investigación sobre fusión de contacto en materiales compuestos laminados Cu/Al. Se presentan los resultados de composición química, microdureza y conductividad eléctrica obtenidos en materiales compuestos laminados Cu/Al, tratados térmicamente a temperaturas superiores a las del eutéctico Cu -Al. El bimetal Cu/Al fue obtenido por soldadura por explosión. La composición química del material tras los tratamientos térmicos se analizó por medio de análisis EDS (Espectroscopia de Energías Dispersiva de Rayos X). La conductividad eléctrica se midió mediante ensayos con corrientes Eddy. Las zonas endurecidas en el material soldado por explosión fueron identificadas. El valor experimental obtenido de la conductividad eléctrica está en concordancia con el calculado por la regla de las mezclas. Los tratamientos térmicos dan lugar a la formación de múltiples intercaras de alta dureza, compuestos de intermetálicos. La conductividad eléctrica de las intercaras identificadas es significativamente menor que las correspondientes al Cu y al Al.

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In this study laminated Al/Cu composite was obtained by explosion welding. The effect of strain-hardened zones and the intermetallic layer on thermal conductivity coefficient was investigated. For this purpose the specimens after explosion welding and after subsequent annealing to obtain the intermetallic layer were studied by X-ray methods and means of optical microscopy to determine the phase composition and the width of intermetallic layer. The microhardness tests were carried out to identify the width of the strain-hardened zones and the intermetallic layer. The thermal conductivity coefficient of the composite was experimentally measured to calculate the thermal properties of the strain-hardened zones and intermetallic layer. The width of the strain-hardened zone and the intermetallic layer was 80 µm and 160 µm respectively. The heat conductivity coefficients of the strain-hardened zones and intermetallic layer were 108 W/(m×K) and less than 35 W/(m×K) respectively.