Nanoscale Abrasive Wear of CoCrMo in In Situ TEM Sliding
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- 作者：Yifeng Liao ; Emily Hoffman ; Laurence D. Marks
- 关键词：Nanotribology ; Cobalt ; In situ ; TEM
- 刊名：Tribology Letters
- 出版年：2015
- 出版时间：March 2015
- 年：2015
- 卷：57
- 期：3
- 全文大小：552 KB
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- 刊物主题：Chemistry
Tribology, Corrosion and Coatings
Surfaces and Interfaces and Thin Films
Theoretical and Applied Mechanics
Physical Chemistry
Nanotechnology- 出版者：Springer Netherlands
- ISSN：1573-2711
文摘
The mechanical behaviour of materials at nanometre dimensions has been a major recent topic of research. In this study, the wear properties of a ~60-nm thin foil made of the ductile fcc phase of a CoCrMo alloy were examined using in situ sliding test in a transmission electron microscope by sliding a silicon AFM tip on the fcc matrix under an applied normal load of 416-,279?nN. The material near the surface was deformed plastically, forming dislocations and dislocation?cells at the surface. The wear process was found to be strongly dependent on extrinsic factors, namely the attack angle between the tip and the CoCrMo surface. At an attack angle of 64°, the surface was removed by continuous fractures 40-3?nm below the surface. At a lower attack angle of 24°, the abrasive wear switched to ploughing.