Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.046102
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Funding
- Australian Research Council for instrumentation [LE0454166]
- [DP0346745]
- Australian Research Council [DP0346745] Funding Source: Australian Research Council
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Atomic-scale imaging and first-principles modeling are applied to the heterophase interface between the Al-Cu solid solution (alpha(Cu)) and theta' (Al2Cu) phases. Contrary to recent studies, our observations reveal a diffuse interface of complex but well-defined structure that enables the progression from alpha(Cu) to theta' over a distance of approximate to 1 nm. We demonstrate that, surprisingly, the observed interfacial structure is not preferred on energetic grounds. Rather, the excess in interfacial energy is compensated by efficient atomic-scale kinetics of the alpha(Cu) -> theta' phase transformation.
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