Intergranular fracture by slip/grain boundary interaction

Journal Article · Sat Sep 01 04:00:00 EDT 1990 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02646987· OSTI ID:6934779

Yoo, M H ^[1]; King, A H ^[2]

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1. Oak Ridge National Lab., TN (United States)
2. State Univ. of New York, Stony Brook, NY (United States). Dept. of Materials Science and Engineering

One of the outstanding problems in materials science is to explain why certain intermetallic compounds are inherently strong but notoriously weak at grain boundaries (GBs). The role of interaction between slip dislocations and [110] tilt boundaries in crack nucleation has been analyzed for the face-centered cubic (fcc) and L1[sub 2] structures. Dislocation absorption into the boundaries is orientation-dependent according to the elastic anisotropy. When the transfer of slip across the boundary is impeded, cleavage fracture is predicted on the (1[bar 1]1) plane. Intergranular fracture can be initiated when a symmetric double pileup of primary slip dislocations from both sides of the boundary occurs simultaneously. The available experimental data on slip/grain boundary interaction and intergranular fracture are in good agreement with the present predictions.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6934779
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 21A; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
ELEMENTS
FCC LATTICES
FRACTURE PROPERTIES
GRAIN BOUNDARIES
GRAIN ORIENTATION
INTERMETALLIC COMPOUNDS
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
ORIENTATION
SLIP