Ferroelastic twin reorientation mechanisms in shape memory alloys elucidated with 3D X-ray microscopy

TL;DR

This study uses 3D X-ray diffraction to analyze the complex mechanisms of twin reorientation in shape memory alloys across multiple scales, revealing insights into deformation processes and guiding future technological applications.

Contribution

It provides a detailed multiscale, in situ analysis of twin microstructure evolution in nickel-titanium alloys, linking mechanisms to texture and strain localization.

Findings

Identified sequence of twin rearrangement mechanisms within deformation bands.

Connected twin reorientation to texture evolution and lattice curvature.

Demonstrated the effectiveness of 3D in situ experiments for complex material analysis.

Abstract

Three-dimensional (3D) X-ray diffraction methods were used to analyze the evolution of the load-induced rearrangements of monoclinic twin microstructures within bulk nickel-titanium specimens in 3D and across six orders of magnitude in length scales: changes in lattice plane spacings and orientations at the nanoscale, growth and nucleation of martensite twin variants at the microscale, and localization of plastic strain into deformation bands at the macroscale. Portions of the localized deformation bands were reconstructed in situ and in 3D. Analyses of the data elucidate the sequence of twin rearrangement mechanisms that occur within the propagating localized deformation bands, connect these mechanisms to the texture evolution, and reveal the effects of geometrically necessary lattice curvature across the band interfaces. The similarities between shear bands and localized deformation bands in twin reorientation are also discussed. These findings will guide future researchers in employing twin rearrangement in novel multiferroic technologies, and they demonstrate the strength of 3D, multiscale, in situ experiments to improve our understanding of complicated material behaviors and to provide opportunities to advance our abilities to model them.