Abstract
The creep characteristics of Ni-NiO dispersion-strengthened alloy and pure nickel as a reference material have been examined in the temperature range of 873-1123 K and in the stress range of 21-73MPa. Structural changes during creep were studied using transmission electron microscopy. Marked differences in sabstructure and creep behavior were found between Ni-NiO alloy and pure nickel. The results obtained are as follows : (1) The value of α, which is the important parameter in evaluating an effective diffusion coefficient Deff, for Ni-NiO alloy was smaller than that for pure nickel. This is caused by low dislocation density in Ni-NiO alloy. (2) The dominant creep deformation mechanism for both materials is a dislocation creep which is controlled by climb of dislocations. (3) Slender and curved subgrains were observed in Ni-NiO alloy. It is suggested that nickel oxide particles act as obstacles to subboundary migration.
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