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Subsurface modifications in powder metallurgy aluminium alloy composites reinforced with intermetallic MoSi2 particles under dry sliding wear

Subsurface modifications in powder metallurgy aluminium alloy composites reinforced with intermetallic MoSi2 particles under dry sliding wear
Subsurface modifications in powder metallurgy aluminium alloy composites reinforced with intermetallic MoSi2 particles under dry sliding wear
The effect of dry sliding wear on the subsurface of six AA6061/MoSi2/15p composites processed by powder metallurgy with varying mixing methods (wet blending, rotating cube and ball milling) and reinforcement sizes was investigated. Three regions could be distinguished: the tribolayer or mechanically mixed layer (MML), the elasto-plastically deformed layer, where deflection of material occurs, and the unaffected bulk. The MML was not uniform along the surface and no relation could be found between the size/shape of MML areas and processing variables or applied loads. In the second region, particles close to the MML were found to be fragmented only in the composites processed using low energy. These composites were the only ones to show hardening, together with the similarly processed unreinforced alloy. It can be concluded that, although the subsurface of these composites are noticeably affected by dry wearing through formation of a mechanically mixed layer and material deflection, the ball milled composites do not suffer subsurface hardening and their reinforcing particles do not break during the test. It is also evident from the present research that no simple correlation exists between the size/shape of the tribolayer and deflection parameters and processing variables or applied loads.
sliding wear, metal-matrix composite, intermetallics, hardness, wear testing, electron microscopy
0043-1648
126-133
Lieblich, M.
21c11c49-ba63-46f1-b3f1-46caa3f88ba2
Corrochano, J.
7ee7c2df-99d5-4999-9f38-83613589d708
Ibáñez, J.
0f0e6b33-0e3a-4160-91d9-a1716b0c1721
Vadillo, V.
5d1c63fe-5848-498e-9e82-3dcdc6b00664
Walker, J.C.
b300eafd-5b0a-4cf5-86d2-735813b04c6f
Rainforth, W.M.
b9c1d1e5-ba6b-4856-8b62-03e38688358b
Lieblich, M.
21c11c49-ba63-46f1-b3f1-46caa3f88ba2
Corrochano, J.
7ee7c2df-99d5-4999-9f38-83613589d708
Ibáñez, J.
0f0e6b33-0e3a-4160-91d9-a1716b0c1721
Vadillo, V.
5d1c63fe-5848-498e-9e82-3dcdc6b00664
Walker, J.C.
b300eafd-5b0a-4cf5-86d2-735813b04c6f
Rainforth, W.M.
b9c1d1e5-ba6b-4856-8b62-03e38688358b

Lieblich, M., Corrochano, J., Ibáñez, J., Vadillo, V., Walker, J.C. and Rainforth, W.M. (2014) Subsurface modifications in powder metallurgy aluminium alloy composites reinforced with intermetallic MoSi2 particles under dry sliding wear. Wear, 309 (1-2), 126-133. (doi:10.1016/j.wear.2013.11.012).

Record type: Article

Abstract

The effect of dry sliding wear on the subsurface of six AA6061/MoSi2/15p composites processed by powder metallurgy with varying mixing methods (wet blending, rotating cube and ball milling) and reinforcement sizes was investigated. Three regions could be distinguished: the tribolayer or mechanically mixed layer (MML), the elasto-plastically deformed layer, where deflection of material occurs, and the unaffected bulk. The MML was not uniform along the surface and no relation could be found between the size/shape of MML areas and processing variables or applied loads. In the second region, particles close to the MML were found to be fragmented only in the composites processed using low energy. These composites were the only ones to show hardening, together with the similarly processed unreinforced alloy. It can be concluded that, although the subsurface of these composites are noticeably affected by dry wearing through formation of a mechanically mixed layer and material deflection, the ball milled composites do not suffer subsurface hardening and their reinforcing particles do not break during the test. It is also evident from the present research that no simple correlation exists between the size/shape of the tribolayer and deflection parameters and processing variables or applied loads.

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More information

Accepted/In Press date: 9 November 2013
e-pub ahead of print date: 19 November 2013
Published date: 15 January 2014
Keywords: sliding wear, metal-matrix composite, intermetallics, hardness, wear testing, electron microscopy
Organisations: Energy Technology Group, Engineering Science Unit, nCATS Group, Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 386522
URI: http://eprints.soton.ac.uk/id/eprint/386522
ISSN: 0043-1648
PURE UUID: edd32142-10f0-49b8-b187-0c0b85003622

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Date deposited: 02 Feb 2016 10:31
Last modified: 15 Jul 2019 20:49

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Contributors

Author: M. Lieblich
Author: J. Corrochano
Author: J. Ibáñez
Author: V. Vadillo
Author: J.C. Walker
Author: W.M. Rainforth

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