Phase transformations and compatibility in helical structures

Abstract

We systematically study phase transformations from one helical structure to another. Motivated in part by recent work that relates the presence of compatible interfaces with properties such as the hysteresis and reversibility of a phase transformation [35, 33, 12, 28], we give necessary and sufficient conditions on the structural parameters of two helical phases such that they are compatible. We show that, locally, four types of compatible interface are possible: vertical, horizontal, helical and elliptical. We discuss the mobility of these interfaces and give examples of systems of interfaces that are mobile and could be used to fully transform a helical structure from one phase to another. These results provide a basis for the tuning of helical structural parameters so as to achieve compatibility of phases. In the case of transformations in crystals, this kind of tuning has led to materials with exceptionally low hysteresis and dramatically improved resistance to transformational fatigue. Compatible helical transformations with low hysteresis and fatigue resistance would exhibit an unusual shape memory effect involving both twist and extension, and may have potential applications as new artificial muscles and actuators.

arXiv comment35 pages

References in corpus (6)

• Study of the cofactor conditions: conditions of supercompatibility between phases
• Helical Miura Origami
• Cyclic Density Functional Theory : A route to the first principles simulation of bending in nanostructures
• Symmetry-adapted real-space density functional theory for cylindrical geometries: application to large X (X=C, Si, Ge, Sn) nanotubes
• An elasticity theory for self-assembled protein lattices with application to the martensitic phase transition in bacteriophage T4 tail sheath
• A spectral scheme for Kohn-Sham density functional theory of clusters

Cited by in corpus (6)

• Helical Miura Origami
• Origami and materials science
• Evolving, complex topography from combining centers of Gaussian curvature
• Ab initio framework for systems with helical symmetry: theory, numerical implementation and applications to torsional deformations in nanostructures
• Interfacial metric mechanics: stitching patterns of shape change in active sheets
• Crystal elasto-plasticity on the Poincaré half-plane