Quantitative mapping of nanotwin variants in the bulk

Jan Schultheiß*, Lukas Porz, Lalitha Kodumudi Venkataraman, Marion Höfling, Can Yildirim, Phil Cook, Carsten Detlefs, Semën Gorfman, Jürgen Rödel, Hugh Simons

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Crystallographic twins are critical to the properties of numerous materials from magnesium alloys to piezoelectrics. Since the onset of the twin formation is highly sensitive to the triaxial mechanical boundary conditions, non-destructive bulk microscopy techniques are required. Elastic strains can be mapped via X-ray diffraction with a 100-200 nm resolution. However, the interplay of strains with nanotwins cannot be characterized. Here, a method based on dark-field X-ray microscopy to quantify the density of nanotwin variants with twin lamellae of sizes as small as several tens of nanometers in embedded subvolumes (70x200x600 nm3) in millimeter-sized samples is introduced. The methodology is corroborated by correlating the local density of twin variants to the long-ranging strain fields for a high-performance piezoelectric material. The method facilitates direct, in situ mapping and quantification of nanoscale structural changes together with their elastic driving fields, which is the key towards controlling and engineering material's performance at nanometric scales.

Original languageEnglish
Article number113878
JournalScripta Materialia
StatePublished - 1 Jul 2021


  • Domains
  • Elasto-morphological coupling
  • Ferroelectricity
  • Twinning
  • X-ray diffraction


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