Effect of Elastic Driving Force on the Evolution of Microstructures in the Secondary Creep Stage

Abstract:

Article Preview

The effect of elastic driving force on the microstructural change of superalloys in the secondary creep stage is evaluated by elastic energy calculations with the concept of effective eigen strain where both lattice mismatch and creep strain are taken into account The elastic energy calculations indicates that the elastic state in the secondary creep stage is totally different to that in the initial one where the lattice misfit between γ and γ' phases is over accommodated along the [100] and [010] directions by creep deformation in the γ phase. The excess creep dislocations for the over accommodation are required so as to develop an internal stress field to prevent further creep deformations. The planer raft structure with the plane normal oriented to the [001] direction is unstable in the over accommodated state. The γ/γ' lamellar interfaces will be inclined to make a wavy raft structure of which elastic energy is lower than the ideal 001 planer raft structure.

Info:

Periodical:

Main Theme:

Edited by:

M. Heilmaier

Pages:

126-131

DOI:

10.4028/www.scientific.net/AMR.278.126

Citation:

K. Tanaka et al., "Effect of Elastic Driving Force on the Evolution of Microstructures in the Secondary Creep Stage", Advanced Materials Research, Vol. 278, pp. 126-131, 2011

Online since:

July 2011

Export:

In order to see related information, you need to Login.

In order to see related information, you need to Login.