Electrodeposited metallic glasses with superlative wear resistance

The electrodeposition route to obtain amorphous alloys offers a facile, low-cost, and versatile alternative to conventional melt quenching. However, there are significant knowledge gaps in tribological properties and wear mechanisms for electrodeposited metallic glasses (EMGs). Here, the wear behavi...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2021-06, Vol.816, p.141315, Article 141315
Main Authors: Pole, Mayur, Sadeghilaridjani, Maryam, Shittu, Jibril, Mahajan, Chaitanya, Ghodki, Nandita, Mukherjee, Sundeep
Format: Article
Language:English
Subjects:
Alloy systems
Alloys
Amorphous alloys
Amorphous materials
Binary alloys
Coefficient of friction
Crack initiation
Critical load
Damage
Deformation wear
Electrodeposition
Failure mechanism
Fracture mechanics
Friction
Mechanical properties
Metallic glass
Metallic glasses
Nickel
Phosphorus
Plastic deformation
Scratch tests
Surface properties
Tribology
Wear
Wear mechanisms
Wear rate
Wear resistance
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Summary:The electrodeposition route to obtain amorphous alloys offers a facile, low-cost, and versatile alternative to conventional melt quenching. However, there are significant knowledge gaps in tribological properties and wear mechanisms for electrodeposited metallic glasses (EMGs). Here, the wear behavior and the scratch response of a model binary amorphous alloy system were investigated. Electrodeposited Ni–P metallic glasses were systematically studied as a function of composition, with amorphous alloy formation over the narrow range of 10 at% to 20 at% phosphorus. The electrodeposited metallic glasses showed hardness values in the range of 6.6–7.4 GPa, modulus in the range of 155–163 GPa, and friction coefficient around 0.50. Among the studied alloys, electrodeposited Ni80P20 showed the lowest wear rate, which was two orders of magnitude lower than electrodeposited pure Ni. The wear mechanism was determined to be extensive plastic deformation along with mild ploughing, micro tears, and formation of discontinuous lubricious oxide patches. Scratch tests showed an increase in critical load for damage initiation with the increase in phosphorus content among the amorphous alloys following the trend: Ni80P20 > Ni85P15 > Ni90P10. The overall wear rate for the electrodeposited metallic glasses was found to be lower than most reported bulk metallic glasses (BMGs). This represents a fundamental study on structure-property correlations in electrodeposited metallic glasses and demonstrates the versatility of electrodeposition in tuning the surface properties of amorphous alloys. •Ni100-xPx (x = 10, 15, 20 at. %) electrodeposited metallic glasses (EMGs) were synthesized by pulsed electrodeposition.•A three-fold higher hardness was observed for the Ni–P EMGs as compared to pure electrodeposited Ni.•Among the electrodeposited metallic glasses, wear rate decreased in the order: Ni90P10 > Ni85P15 > Ni80P20.•The dominant wear mechanisms were found to be abrasive wear and plastic deformation with discontinuous tribo-layers.•Progressive scratch response showed an increase in critical load to initial failure with increase in phosphorus content.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2021.141315