JOINING OF MICROWAVE SINTERED Fe-26Al, Fe-30Al, Fe-26Al-14Ti AND Fe- 30Al-14Ti POWDER MIXTURES BY DIFFUSION BONDING USING Cu INTERLAYER

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In this study, the joinability by diffusion bonding of Fe26Al, Fe26Al14Ti, Fe30Al and Fe30Al14Ti elemental powder mixtures microwave sintered at 550○C for 1 hr have been investigated by using electrolytic Cu interlayer. Following the sintering, the ordered B2(FeAl) phase was observed in the specimens Fe30Al and Fe30Al14Ti, however, another type of ordered phase of D03(Fe3Al) which is found in Fe-Al alloys was not detected in any of the powder mixtures examined in this study. Diffusion bonding was carried out at 550○C for 1 hr and it was shown that, based on the results from shear testing applied on the weld zone of diffusion bonded specimens, shear stresses of the specimens diffusion bonded by using Cu interlayer are independent of composition. The average shear stress was measured to be 23 MPa. Scanning electron microscopy (SEM) studies revealed that a diffusion zone was observed within elemental powders of Fe, Al and Ti that form the mixtures and in Cu interlayer that is in contact with these elements. Elemental distribution analysis on these zones was also made in order to predict the chemical reactions and their kinetics in the diffusion bonded area.

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Powder metallurgy , Microwave sintering , Diffusion bonding , Mechanical properties

Journal Of The Faculty Of Engineering an‎d Architecture Of Gazi University

98

Journal Of The Faculty Of Engineering an‎d Architecture Of Gazi University