Interfaces and dislocation substructures in a Nb-Ti base alloy: influence of creep deformation

• Published in: Journal of materials science Vol. 37; no. 14; pp. 2857 - 2864
• Main Authors: ALLAMEH, S. M, HAYES, R. W, LORIA, E. A, SOBOYEJO, W. O
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 15.07.2002; Springer Nature B.V
• Subjects: Applied sciences; Creep; Creep strength; Deformation; Dislocations; Exact sciences and technology; Materials science; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Niobium base alloys; Orientation; Solid solutions; Solution strengthening; Substructures; Titanium; Interface structure; Titanium alloy; Deformation; Creep; Crystal orientation; Niobium base alloy; Mechanical properties; Substructure; Microstructure; Interface; Dislocation
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1023/A:1016075705269

This paper presents the results of an experimental study of interfaces and dislocation substructures in a Nb-Ti base alloy subjected to creep deformation at different stress levels. Particular attention has been paid to the orientation relationship between the b.c.c. structure matrix and the f.c.c. structure precipitate. A specific orientation relationship, namely: [100]/(110)M∥[220](111)P (where M and P subscripts denote matrix and precipitate, respectively) was observed in the sample subjected to highest stress level. While the coincident site lattice model predicts a (100)/(100) − 45° relationship, the orientation relationship developed is more consistent with lock-in and invariant line models. The implications of the observed relationship are discussed for the strengthening of the solid solution alloy.