Full text loading...
(a) Anelastic anomalies at 0.1 Hz in damping and Young’s modulus outside the normal transformation windows in specimen I (aged at ). Responses in bending after aging at and in torsion after aging at are provided as comparison. (b) Bulk modulus and Poisson’s ratio calculated from a restricted set of points from (a). at 10 Hz (after aging at ) and 0.1 Hz are compared for specimen I. Strain applied is .
Anelastic response (damping and Young’s modulus ): anomalies in specimen III at several frequencies (0.1, 1, and 10 Hz) at a strain of after aging at (a) 50 and (b) .
Anelastic response (damping and Young’s modulus ) of specimen II (a) and specimen I (b) at a strain of at different frequencies after aging at . Results show the relaxation peaks in the damping curves.
(a) Oxygen octahedron in tetragonal unit cell. has two kinds of nonequivalent sites or and . In cubic phase, the distances between and and sites are the same. In the tetragonal phase, distances between and and sites are given (Ref. 7). (b) presents an 180° domain. After aging at , is generated, and are aligned in the same direction. After aging at , is not generated shortly after temperature is reduced through the Curie point, and defects possess cubic symmetry. (c) When stress is applied, will align with respect to and leads to a restoring stress between and .
Article metrics loading...