The fluctuation of short-range order evidenced by mobile dislocations in the γ-phase of a nickel-based superalloy

✍ Scribed by F. Pettinari-Sturmel; A. Coujou; N. Clément

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 236 KB
• Volume: 400-401
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2005.02.072

✦ Synopsis

The analysis of the distribution of moving dislocations is used to obtain the energy associated with the short-range order (SRO) present in the ␥-phase of a nickel-base superalloy. This energy is evaluated at different spatial points within the sample when the dislocations propagate at 25 • C and at 350 • C. An accurate calculation reveals a clear spatial fluctuation of this energy over several micrometers. The SRO thus acts as a non-uniform obstacle with (i) soft areas extending over several micrometers where the nucleation of dislocation sources is enabled and (ii) hard ones where dislocation pile-ups need to be crossed through.