Star-shaped unstable growth of grain-boundary cavities
- 1 December 1978
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine A
- Vol. 38 (6) , 691-696
- https://doi.org/10.1080/01418617808239264
Abstract
Circular cavities growing by vacancy agglomeration during creep are shown to become unstable when they reach a critical size. The size depends on the sum of the applied stress and internal gas pressure in the cavity. The instability is in the form of regular deviations from a circular geometry which lead to star-shaped and finger-like growth. The ratio of surface-diffusion to grain-boundary-diffusion coefficients is shown to substantially affect the conditions for instability. Instabilities are unlikely to be observed during typical cavity growth conditions in metals if this ratio of diffusion coefficients is greater than 100.Keywords
This publication has 9 references indexed in Scilit:
- Grain size stability and switching in two phase polycrystalsScripta Metallurgica, 1978
- Amplitude dependence of the internal friction in copper after annealing at low oxygen pressureScripta Metallurgica, 1976
- Finger-like crack growth in solids and liquidsPhilosophical Magazine, 1976
- The Nucleation and Growth of Cavities in Iron during Deformation at Elevated TemperaturesMetal Science, 1975
- The shape of intergranular creep cracks gro′ing by surface diffusionActa Metallurgica, 1973
- The influence of surface diffusion on the growth of grain boundary voids in creepScripta Metallurgica, 1973
- The morphology and growth of creep cavities in ?-ironJournal of Materials Science, 1969
- A Criterion for Ductile Fracture by the Growth of HolesJournal of Applied Mechanics, 1968
- The growth of grain-boundary voids under stressPhilosophical Magazine, 1959