Enhancement of dislocation generation induced by films on crack surfaces

Journal Article · Mon Oct 01 04:00:00 EDT 1984 · Scr. Metall.; (United States)

DOI:https://doi.org/10.1016/0036-9748(84)90193-5· OSTI ID:6060241

Paskin, A; Dienes, G J; Massoumzadeh, B; Sieradzki, K

The major result of this investigation is that coating a crack with a ''Large Atom Film'' changed the original brittle response to a ductile one. This was the response expected in analogy to earlier results. The conclusion is that ''Large Film Atoms'', i.e. those with an interatomic distance in the film larger than that in the substrate, promote dislocation generation at the film-substrate interface and can thereby change a brittle response, when no film is present, to a ductile one when the crack is coated. Conversely, ''Small Film Atoms'' inhibit dislocation formation and promote brittle fracture in an otherwise ductile material.

• Research Organization: Queens College of CUNY, Flushing, New York
• OSTI ID: 6060241
• Journal Information: Scr. Metall.; (United States), Journal Name: Scr. Metall.; (United States) Vol. 18:10; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
BRITTLE-DUCTILE TRANSITIONS
BRITTLENESS
CRACK PROPAGATION
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DEPOSITION
DISLOCATIONS
ELEMENTS
FILMS
FRACTURE MECHANICS
LINE DEFECTS
MECHANICAL PROPERTIES
MECHANICS
METALLURGY
METALS
PHYSICAL METALLURGY
SURFACE COATING
SURFACE PROPERTIES
THIN FILMS