Abstract
Strategy for preventing excessive wear rate at high loads in bulk metallic glass composites
Victor M. Villapúna, J. Medinab, P. Pérezb, F. Esatc, F. Inama, S. Gonzáleza
aFaculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
bCentro Nacional de Investigaciones Metalúrgicas, CSIC, Avda. Gregorio del Amo 8, 28040 Madrid, Spain
cSchool of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK
Here we present a new strategy for preventing excessive wear rate at high loads in bulk metallic glass composites (BMGCs) by using a Cu45.5Zr51Al3.5 at. % BMGC. Proper selection of a doping element, such as nickel, and its concentration enables to tune the glass transition temperature (Tg) of the alloy so that the friction temperature during sliding, which can be estimated through calculations1, is close to the Tg. Under this condition crystalline phases2 are formed and undergo subsequent oxidation3 (i.e., formation of a lubricating layer) thus preventing massive wear. However, when the friction temperature is much lower than the Tg, the material does not exhibit crystallization and oxidation and therefore it is subject to high wear rate.
Additionally, proper doping was observed to promote the martensitic transformation of the austenitic phase, which also contributes to enhance the wear resistance.
For the three studied alloys, Cu45.5Zr51Al3.5, Cu44.5Zr51Al3.5Ni1 and Cu43.5Zr51Al3.5Ni2 at. %, the mass loss increases with increasing load from 1 to 10 N and the main wear mechanism is governed by delamination. However, the mass loss decreases from 2.6 mg at 10 N to about 2.1 mg at 15 N load due to partial crystallization and oxidation at the highest load.
It can be concluded that proper doping is an effective strategy for preventing excessive wear at high loads and thus can be used to extend the life time of components such and microgears.
1. H.Wu, I. Baker, Y. Liu, X.Wu, P.R.Munroe, J. Zhang. Tribological studies of a Zr-based bulk metallic glass. Intermetallics (2013) 35, 25–32.
[2] A. Inoue. Stabilization of metallic supercooled liquid and bulk amorphous alloys. Acta Mater. (2000) 48, 279–306.
[3] J. Singh, A.T. Alpas. Dry sliding wear mechanisms in a Ti50Ni47Fe3 intermetallic alloy. Wear (1995), 181, 302–311.
Victor M. Villapúna, J. Medinab, P. Pérezb, F. Esatc, F. Inama, S. Gonzáleza
aFaculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
bCentro Nacional de Investigaciones Metalúrgicas, CSIC, Avda. Gregorio del Amo 8, 28040 Madrid, Spain
cSchool of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK
Here we present a new strategy for preventing excessive wear rate at high loads in bulk metallic glass composites (BMGCs) by using a Cu45.5Zr51Al3.5 at. % BMGC. Proper selection of a doping element, such as nickel, and its concentration enables to tune the glass transition temperature (Tg) of the alloy so that the friction temperature during sliding, which can be estimated through calculations1, is close to the Tg. Under this condition crystalline phases2 are formed and undergo subsequent oxidation3 (i.e., formation of a lubricating layer) thus preventing massive wear. However, when the friction temperature is much lower than the Tg, the material does not exhibit crystallization and oxidation and therefore it is subject to high wear rate.
Additionally, proper doping was observed to promote the martensitic transformation of the austenitic phase, which also contributes to enhance the wear resistance.
For the three studied alloys, Cu45.5Zr51Al3.5, Cu44.5Zr51Al3.5Ni1 and Cu43.5Zr51Al3.5Ni2 at. %, the mass loss increases with increasing load from 1 to 10 N and the main wear mechanism is governed by delamination. However, the mass loss decreases from 2.6 mg at 10 N to about 2.1 mg at 15 N load due to partial crystallization and oxidation at the highest load.
It can be concluded that proper doping is an effective strategy for preventing excessive wear at high loads and thus can be used to extend the life time of components such and microgears.
1. H.Wu, I. Baker, Y. Liu, X.Wu, P.R.Munroe, J. Zhang. Tribological studies of a Zr-based bulk metallic glass. Intermetallics (2013) 35, 25–32.
[2] A. Inoue. Stabilization of metallic supercooled liquid and bulk amorphous alloys. Acta Mater. (2000) 48, 279–306.
[3] J. Singh, A.T. Alpas. Dry sliding wear mechanisms in a Ti50Ni47Fe3 intermetallic alloy. Wear (1995), 181, 302–311.
| Original language | English |
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| Title of host publication | Strategy for preventing excessive wear rate at high loads in bulk metallic glass composites |
| Publication status | Published - 9 Nov 2018 |
| Event | Innovative Materials Science & Nanotechnology 2018 - Valencia, Spain Duration: 9 Jul 2018 → 11 Jul 2018 |
Conference
| Conference | Innovative Materials Science & Nanotechnology 2018 |
|---|---|
| Country/Territory | Spain |
| City | Valencia |
| Period | 9/07/18 → 11/07/18 |