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Defects in Al casting alloy in contact with Ni coat - as the Frenkla effect

Grabala K., Patejuk A.

Archives of Foundry Engineering

2007

Vol. 7, iss. 2

7-10

The subjects of analysis of this work are the defects occurring in the contact area of aluminium and nickel. The purpose of this work was to do a model research. The research concerns the mechanism of the occurrence of the defects in the area of contact: aluminium alloy - nickel coat. The model research describes the making of joints between the above mentioned metals in the warming temperature lower than the time of melting temperature of aluminium and the time of welding. It was affirmed that these defects appear as the result of special diffusion - presented in professional literature as the Kirkendall - Frenkla. The made analysis of results allowed to define parameters and factors of pores - appearing it defined plane shifting in the line of parting between the metals. Appearing of three zones of diffusive alloy was observed in the contact area of given (examined) metals. Observed phenomenon of the Frenkl porosity appeared in the area of the occurrence of the Al3Ni and Al3Ni + Al phases.