Dynamics of dislocations and surface instabilities in misfitting heteroepitaxial films

Mikko Haataja; Judith Müller; A. D. Rutenberg; Martin Grant

doi:10.1103/PhysRevB.65.035401

Dynamics of dislocations and surface instabilities in misfitting heteroepitaxial films

Mikko Haataja, Judith Müller, A. D. Rutenberg, Martin Grant

Research output: Contribution to journal › Article › peer-review

Abstract

We introduce a continuum model of elasticity in a nonequilibrium multiphase system-including smooth and singular strains, as well as their coupling to free surfaces-and apply it to the dynamics of misfitting heteroepitaxial films. Above a critical thickness, defects relieve strain, competing with an instability at the interface. Depending on their mobility, defects can screen stress by building up at large-curvature groove tips, leading to high ductility, or be “outrun” by the tips, leading to brittleness. Hence we find a nonequilibrium brittle to ductile transition.

Original language	English (US)
Pages (from-to)	1-5
Number of pages	5
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	65
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevB.65.035401
State	Published - 2002
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.65.035401

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AB - We introduce a continuum model of elasticity in a nonequilibrium multiphase system-including smooth and singular strains, as well as their coupling to free surfaces-and apply it to the dynamics of misfitting heteroepitaxial films. Above a critical thickness, defects relieve strain, competing with an instability at the interface. Depending on their mobility, defects can screen stress by building up at large-curvature groove tips, leading to high ductility, or be “outrun” by the tips, leading to brittleness. Hence we find a nonequilibrium brittle to ductile transition.

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Dynamics of dislocations and surface instabilities in misfitting heteroepitaxial films

Abstract

All Science Journal Classification (ASJC) codes

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