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Cobalt in a 23wt.% Co containing Ni-base superalloys was systematically substituted by Ni in order to study the effects of stacking fault energy (SFE) on the creep mechanisms. The deformation microstructures of the alloys during different creep stages at 725°C and 630MPa were investigated by transmission electron microscopy (TEM). The results showed that the creep life increased as the SFE decreased...
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