Three-dimensional in situ characterization of phase transformation induced austenite grain refinement in nickel-titanium
Abstract
Near-field and far-field high-energy diffraction microscopy and microcomputed tomography X-ray techniques were used to study a bulk single crystal nickel-titanium shape memory alloy sample subjected to thermal cycling under a constant applied load. Three-dimensional in situ reconstructions of the austenite microstructure are presented, including the structure and distribution of emergent grain boundaries. After one cycle, the subgrain structure is significantly refined, and heterogeneous 3 and 9 grain boundaries emerge. The low volume and uneven dispersion of the emergent boundaries across the volume show why previous transmission electron microscopy investigations of grain boundary formation were inconsistent.
Turn this paper into a lesson
ArcXiv compiles a structured reading guide from this paper's metadata: plain-English importance, contributions, prerequisite concepts, which sections to read first, flashcards, and a quiz. Grounded in the abstract, never invented.