Dislocation Mechanisms during High Temperature Creep Experiments on MC2 Alloy

Abstract:

Article Preview

The creep behaviour of MC2 single crystal superalloy has been studied at 1150°C/80 MPa, with an applied load along [001] axis. The resulting dislocation microstructures were examined by transmission electron microscopy. The occurrence of a[010] type dislocations (with a zero Schmid factor) within the ordered γ' precipitates is often observed. It is shown that those dislocations moved by a climb process, based on a mechanism involving two dislocation systems and vacancy exchanges, as proposed in the literature. We calculate the vacancy fluxes associated with such a mechanism and show that the vacancy transportation can be easily insured by a simple diffusion process. This calculation shows that the diffusion and climbing steps do not seem to be the creep rate controlling mechanisms for those situations in MC2 alloy.

Info:

Periodical:

Main Theme:

Edited by:

M. Heilmaier

Pages:

7-12

DOI:

10.4028/www.scientific.net/AMR.278.7

Citation:

F. Touratier et al., "Dislocation Mechanisms during High Temperature Creep Experiments on MC2 Alloy", Advanced Materials Research, Vol. 278, pp. 7-12, 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.