The process of wetting of preoxidised TiAl alloy substrates by aluminium, copper, and silver filler metals has been examined. Two types of wetting behaviour were observed in these systems, one in which the filler metal undermined the oxide layer on the substrate and the other in which the filler metal spread on the outer surface of the substrate oxide layer. The mechanisms leading to these two different types of wetting behaviour are discussed. The effects of filler metal reactivity and of thickness of substrate oxide layer on the wetting process are discussed
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