Abstract
Isothermal (200°C) and thermal cycling (150–250°C at 10 cycles/h) creep and constant strain rate (6.0 × 10 −2 h −1) tests have been carried out on pure zinc and two zinc alloys (Zn - 0.16 at.% Al and Zn - 0.14 at.% Cu). Thermal cycling was observed to increase both the creep rate and the extent of intergranular cavitation in all three alloys. Intergranular cavitation was limited in the pure zinc over the range of test conditions investigated, whereas cavitation was extensive in both the Zn Al and Zn Cu alloys. In the Zn Al alloy sharp grain boundary cracks formed on boundaries at 90° to the tensile axis and in the Zn Cu alloy irregular grain boundary voids were formed on boundaries at 45° to the stress axis. This behaviour has been related to the interaction of solute atoms with the vacancy flux during thermal cycling.
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