Abstract
Results of creep tests in uniaxial tension, torsion and biaxial tension at 250°C show that the creep life of tough pitch copper is determined by the maximum principal applied stress. Preliminary consideration of a simple model of fracture based on the growth of cavities on grain boundaries by vacancy diffusion indicates that a more sophisticated understanding of the mechanism is required to match observed behaviour under multi-axial stress. Consideration of detailed aspects of cavitation observed subsequent to creep suggests that the creep life of the copper will be sensitive to variations in applied stress during primary creep.
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