Abstract
The diffusion welding of poly- and mono-crystalline Cu to mono-crystalline α-Al 2 O 3 is carried out under ultra high vacuum. At the start of the welding process, pores are formed at the interface between the Cu and the α-Al 2 O 3 which gradually heal under the action of the transport processes taking place. The proportion and size of the of pores present across the entire surface as a function of the welding time determined using quantitative image analysis, were compared with similar results obtained from theoretical models. This showed that the healing process undergone by the pores can be explained in terms of the dislocation creep taking place within the Cu. If Cu containing oxygen is welded to α-Al 2 O 3 it is thermodynamically possible for a further phase, the copper aluminate CuAlO 2 , to form. The formation of this phase during subsequent annealing in an oxygen atmosphere after welding was investigated in the scanning electron microscope.
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