The effects of surface films on mechanical behavior of B2 ordered intermetallic alloysSurface films deposited on body-centered cubic metals can greatly reduce the yield and flow stresses and increase the ductility at low homologous temperatures. This softening process is associated with the ability of the film-substrate interface to generate large populations of mobile edge dislocations. This phenomenon is extended to B2 ordered intermetallic alloys, which display many deformation characteristics of bcc metals. Single crystal NiAl coated with thermally formed oxide films and polycrystalline FeAl with electrochemically formed Fe-Al-O films display film softening at and below room temperature. The extent of film softening is shown to depend on many factors, including crystal orientation, deformation temperature, operative slip systems, film thickness, film adherence, and film and substrate properties.
Document ID
19900057283
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Noebe, R. D. (NASA Lewis Research Center Cleveland, OH, United States)
Kim, J. T. (NASA Lewis Research Center Cleveland, OH, United States)
Mcvay, J. W. (NASA Lewis Research Center Cleveland, OH, United States)
Gibala, R. (NASA Lewis Research Center Cleveland, OH; Michigan, University, Ann Arbor, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Subject Category
Metallic Materials
Meeting Information
Meeting: Intl. Conference on Strength of Metals and Alloys (ICSMA 8)