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Title: The effects of segregation on the kinetics of intergranular cavity growth under creep conditions

Abstract

Intergranular cavity growth under creep conditions is examined with particular reference to the potential effects of segregation on cavity growth. When cavities are present on all of the boundaries in a polycrystalline solid, they are able to grow in an unconstrained manner. Under these conditions the rate of cavity growth may be controlled by grain boundary diffusion (D /SUB GB/ ), surface diffusio (D /SUB S/ ), or power law creep, which in turn is controlled by lattice diffusion (D /SUB L/ ). When only isolated boundaries are cavitated, cavity growth is constrained and may be completely limited by creep flow of th surrounding grains. The segregation of solute to the grain boundary and the cavity surface can influence the kinetics of cavity growth in several different ways. The reduction in surface energy associated with segregation can increase the rate of cavity growth when the cavities are crack-like. The effects of segregation on grain boundary and surface diffusion can also influence the rate of cavity growth. A phenomenological relation proposed by Borisov et al indicates that D /SUB GB/ /D /SUB L/ decrease with segregation, thus causing grain boundary diffusion controlled cavity growth to be slowed by segregation. In somemore » cases solute additions increase D /SUB L/ , thus increasing the rate of creep controlled cavity growth. When these effects are sufficiently large, D /SUB GB/ can increase with solute additions, in spite of the effect of segregation. In some alloys D /SUB S/ increases with segregation by several orders of magnitude. Similar effects on cavity growth are not expected even for surface diffusion controlled cavity growth because the rate of cavity growth is limited by other factors when D /SUB S/ is very large.« less

Authors:
; ;
Publication Date:
Research Org.:
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305
OSTI Identifier:
5657150
DOE Contract Number:  
AT03-79ER10378
Resource Type:
Journal Article
Journal Name:
Metall. Trans., A; (United States)
Additional Journal Information:
Journal Volume: 14A
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CAVITIES; CREEP; CONTROL; CRYSTAL LATTICES; DIFFUSION; GRAIN BOUNDARIES; GRAIN GROWTH; MICROSTRUCTURE; POLYCRYSTALS; SEGREGATION; SURFACE AREA; CRYSTAL STRUCTURE; CRYSTALS; MECHANICAL PROPERTIES; SURFACE PROPERTIES; 360103* - Metals & Alloys- Mechanical Properties; 656000 - Condensed Matter Physics

Citation Formats

Nix, W D, Wang, J S, and Yu, K S. The effects of segregation on the kinetics of intergranular cavity growth under creep conditions. United States: N. p., 1983. Web. doi:10.1007/BF02643773.
Nix, W D, Wang, J S, & Yu, K S. The effects of segregation on the kinetics of intergranular cavity growth under creep conditions. United States. https://doi.org/10.1007/BF02643773
Nix, W D, Wang, J S, and Yu, K S. Fri . "The effects of segregation on the kinetics of intergranular cavity growth under creep conditions". United States. https://doi.org/10.1007/BF02643773.
@article{osti_5657150,
title = {The effects of segregation on the kinetics of intergranular cavity growth under creep conditions},
author = {Nix, W D and Wang, J S and Yu, K S},
abstractNote = {Intergranular cavity growth under creep conditions is examined with particular reference to the potential effects of segregation on cavity growth. When cavities are present on all of the boundaries in a polycrystalline solid, they are able to grow in an unconstrained manner. Under these conditions the rate of cavity growth may be controlled by grain boundary diffusion (D /SUB GB/ ), surface diffusio (D /SUB S/ ), or power law creep, which in turn is controlled by lattice diffusion (D /SUB L/ ). When only isolated boundaries are cavitated, cavity growth is constrained and may be completely limited by creep flow of th surrounding grains. The segregation of solute to the grain boundary and the cavity surface can influence the kinetics of cavity growth in several different ways. The reduction in surface energy associated with segregation can increase the rate of cavity growth when the cavities are crack-like. The effects of segregation on grain boundary and surface diffusion can also influence the rate of cavity growth. A phenomenological relation proposed by Borisov et al indicates that D /SUB GB/ /D /SUB L/ decrease with segregation, thus causing grain boundary diffusion controlled cavity growth to be slowed by segregation. In some cases solute additions increase D /SUB L/ , thus increasing the rate of creep controlled cavity growth. When these effects are sufficiently large, D /SUB GB/ can increase with solute additions, in spite of the effect of segregation. In some alloys D /SUB S/ increases with segregation by several orders of magnitude. Similar effects on cavity growth are not expected even for surface diffusion controlled cavity growth because the rate of cavity growth is limited by other factors when D /SUB S/ is very large.},
doi = {10.1007/BF02643773},
url = {https://www.osti.gov/biblio/5657150}, journal = {Metall. Trans., A; (United States)},
number = ,
volume = 14A,
place = {United States},
year = {1983},
month = {4}
}