, Volume 39, Issue 1, pp 39-49
Date: 21 Nov 2007

Creep Deformation Mechanisms in Ru-Ni-Al Ternary B2 Alloys

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The creep behavior of five Ru-Ni-Al ternary alloys with compositions across the ternary RuAl-NiAl B2 phase field has been investigated within a temperature range of 1223 to 1323 K. These alloys exhibited exceptional creep strength compared to other high melting temperature intermetallics. A continuous increase of the melting temperature and creep resistance with increasing Ru/Ni ratio was observed. Post-creep dislocation analyses revealed \( {\left\langle {{\text{100}}} \right\rangle } \) and \( {\left\langle {{\text{110}}} \right\rangle } \) edge dislocations in the Ni-rich alloys, while uniformly distributed \( {\left\langle {{\text{100}}} \right\rangle } \) jogged screw dislocations predominated in the Ru-rich ternary alloys. Transient creep experiments, dislocation substructures, and constitutive modeling indicate a transition of the creep mechanism from viscous glide-controlled to jogged screw-controlled deformation with increasing Ru/Ni ratio.

Manuscript submitted May 24, 2007.