Gradient Nanostructured Tantalum by Thermal-Mechanical Ultrasonic Impact Energy
| Autor: | Jong-Min Chae, Auezhan Amanov, Keun-Oh Lee |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
tantalum residual stress 02 engineering and technology lcsh:Technology 01 natural sciences Article dry wear behavior Residual stress hardness gradient nanostructured layer grain size 0103 physical sciences General Materials Science Composite material lcsh:Microscopy lcsh:QC120-168.85 010302 applied physics lcsh:QH201-278.5 lcsh:T 021001 nanoscience & nanotechnology Microstructure Hardness Nanocrystalline material Grain size lcsh:TA1-2040 Surface modification lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering Severe plastic deformation lcsh:Engineering (General). Civil engineering (General) 0210 nano-technology lcsh:TK1-9971 Electron backscatter diffraction |
| Zdroj: | Materials Materials, Vol 11, Iss 3, p 452 (2018) Materials; Volume 11; Issue 3; Pages: 452 |
| ISSN: | 1996-1944 |
| Popis: | Microstructural evolution and wear performance of Tantalum (Ta) treated by ultrasonic nanocrystalline surface modification (UNSM) at 25 and 1000 °C were reported. The UNSM treatment modified a surface along with subsurface layer with a thickness in the range of 20 to 150 µm, which depends on the UNSM treatment temperature, via the surface severe plastic deformation (S2PD) method. The cross-sectional microstructure of the specimens was observed by electron backscattered diffraction (EBSD) in order to confirm the microstructural alteration in terms of effective depth and refined grain size. The surface hardness measurement results, including depth profile, revealed that the hardness of the UNSM-treated specimens at both temperatures was increased in comparison with those of the untreated ones. The increase in UNSM treatment temperature led to a further increase in hardness. Moreover, both the UNSM-treated specimens with an increased hardness resulted in a higher resistance to wear in comparison with those of the untreated ones under dry conditions. The increase in hardness and induced compressive residual stress that depend on the formation of severe plastically deformed layer with the refined nano-grains are responsible for the enhancement in wear resistance. The findings of this study may be implemented in response to various industries that are related to strength improvement and wear enhancement issues of Ta. |
| Databáze: | OpenAIRE |
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