Cavitation at migrating boundaries during high temperature fatigue

Journal Article · Mon Jun 01 00:00:00 EDT 1987 · Scr. Metall.; (United States)

DOI:https://doi.org/10.1016/0036-9748(87)90331-0· OSTI ID:5818619

Raman, V

There is growing interest in the role of migrating boundaries during high temperature deformation. One area of current interest is the manner in which grain boundary migration can influence deformation and fracture at elevated temperatures. Much of the detailed treatments of intergranular cracking and cavitation during creep deformation have centered on effects occurring at stationary grain boundaries. The conventional idea represented in numerous publications is that grain boundary sliding plays an important role in intergranular fracture at elevated temperatures. The large stress concentrations developed at irregularities on grain boundaries are frequently cited as the principal reason for the easy generation of cracks and cavities. This article concludes that high temperature fatigue can cause significant migration and sliding in Al-3% Mg and Pb-2% Sn solid solution alloys, and that microcavitation and cracking takes place at the migrating boundaries in specimens tested at large strain amplitudes and low test frequencies. Cavities may be isolated within grains due to boundary migration.

• Research Organization: IBM T.J. Watson Research Center, Yorktown Heights, NY 10598
• OSTI ID: 5818619
• Journal Information: Scr. Metall.; (United States), Vol. 21:6
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CRACK PROPAGATION
THERMAL FATIGUE
LEAD ALLOYS
MAGNESIUM ALLOYS
TIN ALLOYS
CAVITIES
CRACKS
CREEP
DEFORMATION
FRACTURE MECHANICS
FRACTURES
GRAIN BOUNDARIES
SOLID SOLUTIONS
STRAINS
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE EFFECTS
THERMODYNAMIC PROPERTIES
ALLOYS
CRYSTAL STRUCTURE
DISPERSIONS
FAILURES
FATIGUE
MECHANICAL PROPERTIES
MECHANICS
MICROSTRUCTURE
MIXTURES
PHYSICAL PROPERTIES
SOLUTIONS
360102* - Metals & Alloys- Structure & Phase Studies
360104 - Metals & Alloys- Physical Properties
360103 - Metals & Alloys- Mechanical Properties