Strategy for preventing excessive wear rate at high loads in bulk metallic glass composites

Villapún, Victor, Medina, Judith, Pérez, Pablo, Esat, Faye, Inam, Fawad and Gonzalez Sanchez, Sergio (2017) Strategy for preventing excessive wear rate at high loads in bulk metallic glass composites. Materials & Design, 135. pp. 300-308. ISSN 0264-1275

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Official URL: https://doi.org/10.1016/j.matdes.2017.09.035

Abstract

The effect of nickel additions to tune the wear performance of Cu45.5Zr51Al3.5 at.% alloy has been studied to present a new strategy for preventing excessive wear rate at high loads in metallic glass composites. This strategy consists of proper selection of a doping element in controlled concentrations with the ability to decrease the glass transition temperature (Tg) of the alloy so that the friction temperature during sliding is close to the Tg. This enables the formation of crystalline phases and their subsequent oxidation (lubricating layer) on the contact surface during sliding thus enhancing the wear resistance. Proper doping can also contribute towards the wear resistance when the content of the doping element promotes the martensitic transformation. The results show that the main wear mechanism for the three studied alloys (Cu45.5Zr51Al3.5, Cu44.5Zr51Al3.5Ni1 and Cu43.5Zr51Al3.5Ni2 at.%) is governed by delamination and the mass loss increases with increasing load from 1 to 10 N. However, for the maximum load of 15 N, the calculated friction temperature is close to Tg for the Ni-containing alloys and partial crystallization and oxidation take place resulting in a mass loss decrease from about 2.6 mg (at 10 N) to about 2.1 mg (at 15 N).

Item Type: Article
Uncontrolled Keywords: Tribological properties; Doping element; Metallic glass composite; Pin-on-disc
Subjects: F200 Materials Science
F300 Physics
H300 Mechanical Engineering
J200 Metallurgy
J500 Materials Technology not otherwise specified
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Fawad Inam
Date Deposited: 25 Sep 2017 11:57
Last Modified: 28 Sep 2017 03:32
URI: http://nrl.northumbria.ac.uk/id/eprint/31944

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