Steps, dislocations and disconnections as interface defects relating to structure and phase transformations

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(96)00132-2· OSTI ID:417824

Hirth, J P ^[1]; Pond, R C ^[2]

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1. Washington State Univ., Pullman, WA (United States). Mechanical and Materials Engineering Dept.
2. Univ. of Liverpool (United Kingdom). Materials Science and Engineering Dept.

Interfacial defects may exhibit both dislocation and step-like character. The Burgers vector of such a defect is an invariant topological quantity which can be determined mathematically or graphically by circuit mapping. Step character cannot be determined directly by such methods, but a new definition of scalar step heights is presented here in terms of crystallographic parameters. This partition of a disconnection into dislocation and step portions facilitates the analysis of processes such as phase transformations; the dislocation and step portions facilitates the analysis of processes such as phase and the step portion with divergences in diffusional fluxes associated with growth. Examples are given in the h.c.p./f.c.c. case for various types of defect.

• OSTI ID: 417824
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 12 Vol. 44; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BURGERS VECTOR
CRYSTALLOGRAPHY
DIFFUSION
DISLOCATIONS
INTERFACES
MICROSTRUCTURE
PHASE TRANSFORMATIONS
POLYCRYSTALS