Mechanisms of cavity growth in creep

Journal Article · Sat Jan 01 00:00:00 EST 1983 · Scr. Metall.; (United States)

DOI:https://doi.org/10.1016/0036-9748(83)90063-7· OSTI ID:5657024

Chen, I W

The growth of intergranular cavities under creep conditions is of considerable technological interest. However, the phenomenon is complex. First, kinetic and mechanical processes at elevated temperature are many. Second, the size distribution of cavities, being a function of time, varies from one grainboundary to the other due to the heterogeneous and continuous nucleation of new cavities. Third, the orientation and the surroundings of each grain-boundary is different, giving rise to a broad spectrum of growth conditions of different mechanical descriptions. These considerations result in an almost infinite number of cases which are too numerous to analyze deterministically. For a mechanistic understanding, certain idealizations have to be made. This paper attempts to give an up-to-date account of such understanding, with the necessary idealization, and to point out the deficiencies in the simplified picture in each case. As an outline, the authors pose the following three problems in the order of increasing complexity. The simplest case pertains to cavitation on the transverse grain-boundary in a bicrystal under a normal stress. The second idealized case deals with cavitation on transverse boundaries in a polycrystal. The third case deals with inclined boundaries when the additional component of grain-boundary sliding sometimes causes ''anomalous'' effects.

• Research Organization: Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
• DOE Contract Number: AC02-77ER04461
• OSTI ID: 5657024
• Journal Information: Scr. Metall.; (United States), Vol. 17:1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CREEP
CAVITIES
SPATIAL DISTRIBUTION
POLYCRYSTALS
CRYSTAL LATTICES
GRAIN BOUNDARIES
GRAIN GROWTH
GRAIN ORIENTATION
MECHANICAL PROPERTIES
NUCLEATION
TECHNOLOGY ASSESSMENT
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
CRYSTAL STRUCTURE
CRYSTALS
DISTRIBUTION
MICROSTRUCTURE
ORIENTATION
360103* - Metals & Alloys- Mechanical Properties