Microstructural effects on the sliding wear of transparent magnesium-aluminate spinel |
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| Authors: | Oscar Borrero-López Angel L Ortiz Andrew D Gledhill Fernando Guiberteau Thomas Mroz Lee M Goldman Nitin P Padture |
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| Affiliation: | 1. Departamento de Ingeniería Mecánica, Energética y de los Materiales, Escuela de Ingenierías Industriales, Universidad de Extremadura, 06006 Badajoz, Spain;2. Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, USA;3. Surmet Corporation, Burlington, MA 01803, USA;4. School of Engineering, Brown University, Providence, RI 02912, USA;1. Anadolu University, Faculty of Engineering, Department of Materials Science and Engineering, Iki Eylul Campus, 26555 Eskisehir, Turkey;2. Anadolu University, Faculty of Fine Arts, Department of Ceramic and Glass, Eskisehir, Turkey;1. Institute for Research on Ceramics (IRCER), UMR CNRS 7315, Univ. Limoges, F-87068 Limoges, France;2. Israel Ceramic and Silicate Institute (ICSI), Technion City, 32000 Haifa, Israel;3. SOLCERA, F-45063 Evreux, France;4. CILAS, F-45100 Orléans, France;1. Jiangsu Key Laboratories of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China;2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;1. Forschungszentrum Jülich GmbH, IEK-2, 52146 Jülich, Germany;2. CeramTec-ETEC GmbH, 53797 Lohmar, Germany |
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| Abstract: | Grain size effects have been investigated in the lubricated sliding wear of three transparent magnesium aluminate (MgAl2O4) spinel materials with different grains sizes identified as: Nano, Fine, and Coarse. Only Fine spinel shows classical wear behavior, which is characterized by initial mild wear followed by a sharp transition to severe fracture-controlled wear. Worn surfaces of Fine spinel show extensive grain pullout, consistent with intergranular mode of fracture found in that spinel. Nano and Coarse spinels both show gradual transition from mild wear to severe wear, and both have significantly lower overall wear rates compared to Fine spinel. Worn surfaces in both Nano and Coarse spinels show transgranular fracture and material removal, which is reminiscent of lateral-crack induced chipping. The transgranular fracture mode in Nano spinel can be attributed to stronger grain boundaries in that spinel, which could be due to the Y2O3 sintering additive used for grain refinement. Whilst the large scale of the grains in Coarse spinel could be responsible for the transgranular fracture observed in that spinel. |
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