An evaluation of the rate-controlling flow process in Harper-Dorn creep

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(94)90328-X· OSTI ID:7029227

Wang, J N ^[1]; Langdon, T G ^[2]

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1. Univ. of Tokyo (Japan). Earthquake Research Inst.
2. Univ. of Southern California, Los Angeles, CA (United States)

Using experimental data for Harper-Dorn creep in several different materials, it is demonstrated that the rate-controlling flow process is the climb of edge dislocations under saturated conditions and under a constant dislocation density which is determined by the magnitude of the Peierls stress. A rate equation is presented which may be used to predict the occurrence of Harper-Dorn creep in any crystalline material.

• OSTI ID: 7029227
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 42:7; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360603 -- Materials-- Properties
CREEP
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
EQUATIONS
GRAIN SIZE
LINE DEFECTS
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
PEIERLS-NABARRO FORCE
SIZE