Surface film effects during cyclic deformation of dislocation-mobility-limited materials

It is demonstrated that there are large surface effects in the fatigue response of the materials investigated. For dislocation-mobility-limited materials such as bcc metals (e.g. tungsten) and B sub 2 ordered alloys, surface films can greatly enhance the monotonic and cyclic plasticity at low homolo...

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Bibliographic Details
Published in:Scripta metallurgica et materialia 1992-05, Vol.26 (10), p.1529-1534
Main Authors: Bowman, K.J., Hartfield-Wünsch, S.E., Gibala, R.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Fatigue
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
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Summary:It is demonstrated that there are large surface effects in the fatigue response of the materials investigated. For dislocation-mobility-limited materials such as bcc metals (e.g. tungsten) and B sub 2 ordered alloys, surface films can greatly enhance the monotonic and cyclic plasticity at low homologous temperatures by allowing generation of mobile dislocations into the materials from sources that would not otherwise be available or operative. For bcc metals, distinct cyclic film-induced softening regimes are observed corresponding to relatively low and high plastic strain amplitudes, respectively. For B sub 2 ordered alloys, film-enhanced cyclic plasticity is also observed, even though the cyclic deformation behavior is not as well characterized. Ni sub 50 Fe sub 20 Al sub 30 and Fe sub 60 Al sub 40 are discussed.
ISSN:0956-716X
DOI:10.1016/0956-716X(92)90251-9