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ABSTRACT Despite their wide presence in hcp metals, incoherent tilt grain boundaries (ITGBs) are rarely studied. In this work, first-principles calculations were combined with atomic-resolution HAADF-STEM analyses to investigate the… Click to show full abstract
ABSTRACT Despite their wide presence in hcp metals, incoherent tilt grain boundaries (ITGBs) are rarely studied. In this work, first-principles calculations were combined with atomic-resolution HAADF-STEM analyses to investigate the structure and formation of one special type ITGB in an Mg-Gd alloy featured with a unique Gd-rich cluster segregation pattern. Our results suggested this ITGB as a mirror-glide boundary formed by gliding the atoms along [] of a {}<> coherent twin boundary due to its interaction with stacking faults. The ITGB can be further stabilized by partial-column Gd substitution, leading to the observed unique segregation pattern. GRAPHICAL ABSTRACT IMPACT STATEMENT A strategy of combining first-principles calculations with atomic-resolution HAADF-STEM has been developed and showed great promises for interpreting complex ITGB structures with solute-cluster segregation in hcp crystals.
Journal Title: Materials Research Letters
Year Published: 2020
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