Surface Severe Plastically Deformed Nanostructured AA7075 Alloy: Assessment on Tribological and Axial Fatigue Behaviors
| Autor: | Okan Unal, Erfan Maleki, Fazil Husem, Ibrahim Karademir, Yusuf Efe |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering residual stress 02 engineering and technology Surface finish Tribology 021001 nanoscience & nanotechnology Shot peening Microstructure 01 natural sciences Indentation hardness severe shot peening Mechanics of Materials Residual stress 0103 physical sciences grain refinement General Materials Science Crystallite Composite material 0210 nano-technology axial fatigue Electron backscatter diffraction |
| Zdroj: | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE |
| ISSN: | 1544-1024 1059-9495 |
| Popis: | AA7075 alloy is exposed to severe shot peening (SSP) with an Almen intensity of 20A. The microstructure is analyzed via FEGSEM and EBSD microscopy. X-ray diffraction (XRD) analysis is used to evaluate the crystallite size in terms of FWHM measurements. The residual stress measurements show a thicker compressed layer (600 µm) formed by SSP. Microhardness improvements are observed as 30% on topmost surface and releases substantially after 600 µm. Coefficient of friction (COF) of treated material remains higher throughout the sliding distance, however, is reduced particularly in the early stage of sliding distance for the wear load of 20 N. The effect of SSP is vanished particularly at lower loads with longer sliding distances. Besides, improvement on fatigue behavior is observed after SSP despite the increase of roughness remarkably. |
| Databáze: | OpenAIRE |
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