Effect of ruthenium on compressive creep of Ni-based single-crystal superalloy
Received 19 February 2010; received in revised form 6 June 2010; accepted 30 June 2010. published online 09 July 2010.
Effects of Ru on the compressive creep of Ni-based single-crystal superalloys were investigated at 750 and 900°C. The addition of Ru improved the creep strength at 750°C. It enhanced the dissociation of dislocations in the matrix channels and would inhibit the nucleation of the a〈112〉 dislocation ribbons which shear the matrix and the precipitates; as a result, the mechanical-twin formation was also impeded and creep strength was increased. However, Ru addition did not improve creep strength at 900°C.
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