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Compression tests at room and high temperature and creep tests at high temperature have been performed on B2 Nb15A120V and Nb10Al20V alloys. At room temperature, in the as-cast state, both alloys exhibited significant ductility in compression. The Burgers vectors of the dislocations were found to be 1/2<111> slipping on {112}. The dislocations showed good mobility. Dislocation clusters also triggered the formation of pseudotwins, which resulted in serrated yielding. In steady state creep, deformation occurred by a combination of dislocation glide and climb, giving a homogeneous mi-crostructure. The dislocations in NblOAl20V were determined to be 1/2(111) slipping on {110} with some <100> segments. After creep at 1100℃, Nb 15A120V showed a two phase structure with a few dislocations in the A15 phase but no dislocations in the A2 phase.
Compression tests at room and high temperature and creep tests at high temperature have been performed on B2 Nb15A120V and Nb10Al20V alloys. At room temperature, in the as-cast state, both alloys exhibits significant ductility in compression. The Burgers vectors of the dislocations were found to be 1/2 <111> slipping on {112}. The dislocations showed good mobility. Dislocation clusters also triggered the formation of pseudotwins, which resulted in serrated yielding. In steady state creep, step occurred by a combination of dislocation glide and climb , giving a homogeneous mi-crostructure. The dislocations in NblOAl20V were determined to be 1/2 (111) slipping on {110} with some <100> segments. After creep at 1100 ° C, Nb 15A120V showed a two phase structure with a few dislocations in the A15 phase but no dislocations in the A2 phase.