Abstract
The behaviour of cold-welded AlCu joints during annealing was studied. The deterioration of the cohesion strength of such joints was found to be caused by precipitation of definite intermetallic phases at the interface. Estimates of density changes associated with phase transformation allowed quantitative comparison of the harmfulness of different phases. The present study sets and substantiates the temperature limit of 200°C for the safe exploitation of cold-welded AlCu joints in electrical machines. This is the temperature above which intermetallic phases appear and mechanical properties deteriorate by more than 10% compared with the initial state.
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