Abstract
Abstract In this study we have evaluated the energetic stability of boundaries between Kurdjumov–Sachs (K–S) variants to explain the morphology of sub-block and block in lath martensite. Interfacial energy of different variant pairs was calculated by using molecular dynamics simulation. Three dimensional models of tilt and twist boundary with a method evaluating interfacial energy were developed. The results showed energetic stability of twist boundary with small misorientation from 0 to 5.5°/[0 1 1] α′ in consistence with previous transmission electron microscope observation. For other boundary with larger misorientation, the twin-related variants had the smallest interfacial energy although this variant pair was not frequently observed in electron backscatter diffraction analysis.
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