Domain Structure Produced by Confined Displacive Transformation and Its Response to the Applied Field

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Vol. 39; no. 7; pp. 1658 - 1664
• Main Authors: Ni, Y., Jin, Y.M., Khachaturyan, A.G.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.07.2008; Springer; Springer Nature B.V
• Subjects: Alloys; Applied sciences; Characterization and Evaluation of Materials; Chemicals; Chemistry and Materials Science; Crystal lattices; Exact sciences and technology; Geometry; Materials Science; Metallic Materials; Metallurgy; Metals. Metallurgy; Nanotechnology; Plastic deformation; Solid solutions; Structural Materials; Studies; Surfaces and Interfaces; Thin Films; Domain Structure; Applied Stress; Displacive Transformation; Total Free Energy; Macroscopic Strain
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-008-9518-1

A strain response to the applied stress of domain structure formed by a displacive transformation confined within the previously formed precipitates of the precursor phase is investigated by using three-dimensional (3-D) phase field microelasticity modeling. It is shown that the initial domain structure within particles is rearranged upon application of the stress field and is restored upon removal of the stress. As a result, the macroscopic strain caused by the domain rearrangement is recoverable. The modeling also shows that the change of the domain structure and the resultant macroscopic strain strongly depend on the magnitude and direction of the applied stress. It is found that the effect of geometrical confinement within precipitates on the stress-accommodating domain structure is the origin of the restoring driving force to the initial domain configuration. A possible relevance of this confinement mechanism to the strain reversibility in some materials systems is discussed.