Micro/Nanosilver Contribution in Modifying the Lubrication Film to Improve Friction and Wear Behaviors of TiAl-10 wt.%Ag Composite

Tribological performances of solid films are studied to improve their application range while retaining the longevity and high accuracy of TiAl alloy. For a ball-on-flat tribopair system, addition of micro/nanosilver improved the tribological behaviors of TiAl-10 wt.% Ag self-lubricating composite (...

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Bibliographic Details
Published in:Advances in materials science and engineering 2022, Vol.2022, p.1-11
Main Authors: Yang, Kang, Xiao, Na
Format: Article
Language:English
Subjects:
Alloys
Antifriction
Cross-sections
Frictional wear
Grain refinement
Hardness
Intermetallic compounds
Lubricants & lubrication
Morphology
Plasma sintering
Self lubrication
Silver
Sliding friction
Titanium aluminides
Titanium base alloys
Tribology
Wear particles
Wear resistance
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Summary:Tribological performances of solid films are studied to improve their application range while retaining the longevity and high accuracy of TiAl alloy. For a ball-on-flat tribopair system, addition of micro/nanosilver improved the tribological behaviors of TiAl-10 wt.% Ag self-lubricating composite (TASC), compared to those of TiAl alloy. Notably, during microstructure evolution of the wear scar cross-section, a large amount of silver migrated from the TASC to the wear scar, and the silver distributions increased. This influx continuously enriched silver on the wear scar cross-section and formed a low-hardness lubrication film. Concurrently, a large amount of wear debris from the dry sliding wear contributed enough refinements to form a high hardness grain refinement layer. The results confirmed the formation of a 0.75 GPa hardness film with solid lubrication on a grain refined layer of 6.86 GPa hardness, resulting in excellent antifriction and wear resistance from 72 min to 90 min of the TASC. These results can help to evaluate the tribological characteristics for their commercial application and can conceptualize possible solutions for TiAl alloy-base components.
ISSN:1687-8434
1687-8442
DOI:10.1155/2022/3169938