Abstract
The experiments were carried out to study how the minimum creep rate of Ni-Al solid solution alloys depends on stress and temperature at temperatures of 600∼750°C and a stress of 2∼5 kg/mm2. The minimum creep rate \dotε can be well expressed by the equation
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and the values of A, n and Q were obtained. Here σ is the applied stress, A the frequency factor, Q the activation energy, R the gas constant and T the absolute temperature. The apparent activation energies and n values for the Ni-2.1 at%Al alloy and Ni-6.0 at%Al alloy were 65.5(0.93) kcal/mol, 5.9(0.65) and 59.3(0.81) kcal/mol, 5.3(0.79), respectively (the values in parentheses express the standard deviations). The calculated A values were 1.9×109(0.35×109) for Ni-2.1%Al and 5.6×106(1.3×106) for Ni-6.0%Al alloy under the constant applied stress.
