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Plastic Deformation of 〈001〉 Single‐Crystal SrTiO 3 by Compression at Room Temperature
Author(s) -
Yang KaiHsun,
Ho NewJin,
Lu HongYang
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.04473.x
Subject(s) - materials science , work hardening , softening , single crystal , dislocation , hardening (computing) , composite material , slip (aerodynamics) , microstructure , partial dislocations , deformation (meteorology) , plasticity , crystallography , frank read source , condensed matter physics , thermodynamics , chemistry , physics , layer (electronics)
The plastic deformation of (001) single‐crystal SrTiO 3 is investigated using compression along [001] at room temperature. A total plastic strain of ∼19% ± 2% is consistently obtained. The stress–strain curve exhibiting four work‐hardening stages are describable using the stage 0 of axis rotation, the stage I “easy glide,” the stage II multiple slip and the wall‐and‐cell structure, and the stage III work softening and dynamic recovery before sample fracture takes place. It is revealed by analyzing the microstructure for each work‐hardening stage that the plastic deformation of single‐crystal SrTiO 3 closely resembles that of metals. The primary slip systems of [011]and(011) predominate in stage I where plastic deformation occurs by the migration of kink pairs in collinear partial dislocations. The activation of multiple slips including [101]and(101), and [011]and(011) in stage II produces the cell‐and‐wall structure which is also characteristic of plastically deformed metals. In stage III with decreasing work‐hardening rate, the bow‐out dislocation interaction from opposite walls results in annihilation. The reaction between dislocations from adjacent walls produces the resultant dislocations withparallel to the load axis [001]. These dislocations are sessile, which eventually leads to sample fracture.