AFM and FIB Study of Cyclic Strain Localization and Surface Relief Evolution in Fatigued f.c.c. Polycrystals

Abstract:

Atomic force microscopy (AFM) and focused ion beam technique (FIB) were adopted to study the early stages of surface relief evolution in 316L steel and polycrystalline copper fatigued with constant plastic strain amplitudes at different temperatures (316L steel at 93, 173 and 573 K; copper at 83, 173 and 295 K). Qualitative and quantitative data on the morphology and shape of persistent slip markings (PSMs), occurrence of extrusions and intrusions and the kinetics of extrusion growth are reported. They are discussed in relation with recent physically based theories of surface relief formation leading to fatigue crack initiation.

• Periodical: Advanced Materials Research (Volumes 891-892)
• Pages: 524-529
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.891-892.524
• Online since: March 2014
• Authors: Jiří Man*, Miroslav Valtr, Ivo Kuběna, Martin Petrenec, Karel Obrtlík, Jaroslav Polák
• Keywords: 316L Austenitic Steel, Atomic Force Microscope (AFM), Extrusion, Fatigue Crack Initiation, Focused Ion Beam (FIB), Intrusion, Persistent Slip Band (PSB), Polycrystalline Copper

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