Abstract: The compressive creep behavior of an as-cast ZA27 alloy was investigated at room and high temperatures in the range of 20~160℃ and different compressive stress in the range of 50~137.5MPa with special apparatus. The results show that the creep increases with increasing temperature and compressive stress. There is linear logarithmic relationship between the steady creep rate and all the temperature and stress used. The steady creep rate obeys an empirical equation. The stress exponents at different temperatures are similar, i.e. 3.97(20℃), 3.87(60℃), 3.82(100℃) and 3.81(160℃). And the appearance activation energies under different stresses are not greatly different, i.e. 84.58, 84.28, 83.15 and 83.89kJ/mol. The average values, stress exponent and activation energy, are 3.87 and 83.73kJ/mol respectively. Materials constant A is 0.002. The steady creep rate of the experimental alloy is controlled by lattice diffusion in zinc or by a dislocation limb.
The compressive creep behavior of an as-cast ZA27 alloy was investigated at room and high temperatures in the range of 20~160 ℃ and different compressive stress in the range of 50~137.5 MPa with special apparatus. The results show that the creep increases with increasing temperature and compressive stress. There is linear logarithmic relationship between the steady creep rate and all the temperature and stress used. The steady creep rate obeys an empirical equation. The stress exponents at different temperatures are similar, i.e. 3.97 (20 ℃) , 3.87 (60 ℃) , 3.82 (100 ℃) and 3.81 (160 ℃) . And the appearance activation energies under different stresses are not greatly different, i.e. 84.58, 84.28, 83.15 and 83.89 kJ/mol. The average values, stress exponent and activation energy, are 3.87 and 83.73 kJ/mol respectively. Materials constant A is 0.002. The steady creep rate of the experimental alloy is controlled by lattice diffusion in zinc or by a dislocation limb.