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The influence of HPT on microstructure and wear resistance of Al-7wt%Si-2wt%Fe alloy

The influence of HPT on microstructure and wear resistance of Al-7wt%Si-2wt%Fe alloy
The influence of HPT on microstructure and wear resistance of Al-7wt%Si-2wt%Fe alloy
An aluminum silicon-based alloy Al-7wt%Si-2wt%Fe, was processed by severe plastic deformation technique in high-pressure torsion (HPT) at room temperature under a pressure of 6.0 GPa and rotational speed of 1.0 rpm with various numbers of turns up to five. Microstructure evolution, especially iron-containing intermetallic phases, was observed using an optical microscope and a scanning electron microscope (SEM). The microstructure results demonstrate that the large strains introduced by HPT at ambient temperature cause fragmentation of iron-intermetallic particles. The degree of fragmentation increases with increasing numbers of turns so that the intermetallic particles decreased in size with increasing imposed strain. In addition, the wear properties were evaluated using ball-on-disc dry sliding testing for both the as-cast material and the alloy processed by HPT using micro-tribometer UMT-2 (CETR Co., USA) following the ASTM G99-05 (2010) standard. The wear tests were conducted on the surface of the samples at 1.5 mm from the disc center under a normal load of 5 N with a rotational speed of 60 rpm and sliding time of 10 min. The friction coefficient and wear volume loss were examined to evaluate the effect of HPT on wear resistance. The results show that the samples processed by HPT have lower average values for the COF and wear volume loss than that of unprocessed samples.
Aluminium Silicon based alloy, high-pressure torsion (HPT), microstructure, friction coefficient, wear resistance
1662-9752
1618-1623
Wongsa-Ngam, Jittraporn
3a196159-d8e5-4658-a47b-a6f6c5a7dcc7
Xu, Jie
ff6d4656-c15b-45a4-bd71-d45937ec38fc
Phongphisutthinan, Chakkrist
d9bf4b9d-2198-45c0-a9f2-b0134d35dcbe
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Wongsa-Ngam, Jittraporn
3a196159-d8e5-4658-a47b-a6f6c5a7dcc7
Xu, Jie
ff6d4656-c15b-45a4-bd71-d45937ec38fc
Phongphisutthinan, Chakkrist
d9bf4b9d-2198-45c0-a9f2-b0134d35dcbe
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Wongsa-Ngam, Jittraporn, Xu, Jie, Phongphisutthinan, Chakkrist and Langdon, Terence G. (2021) The influence of HPT on microstructure and wear resistance of Al-7wt%Si-2wt%Fe alloy. Materials Science Forum, 1016, 1618-1623. (doi:10.4028/www.scientific.net/MSF.1016.1618).

Record type: Article

Abstract

An aluminum silicon-based alloy Al-7wt%Si-2wt%Fe, was processed by severe plastic deformation technique in high-pressure torsion (HPT) at room temperature under a pressure of 6.0 GPa and rotational speed of 1.0 rpm with various numbers of turns up to five. Microstructure evolution, especially iron-containing intermetallic phases, was observed using an optical microscope and a scanning electron microscope (SEM). The microstructure results demonstrate that the large strains introduced by HPT at ambient temperature cause fragmentation of iron-intermetallic particles. The degree of fragmentation increases with increasing numbers of turns so that the intermetallic particles decreased in size with increasing imposed strain. In addition, the wear properties were evaluated using ball-on-disc dry sliding testing for both the as-cast material and the alloy processed by HPT using micro-tribometer UMT-2 (CETR Co., USA) following the ASTM G99-05 (2010) standard. The wear tests were conducted on the surface of the samples at 1.5 mm from the disc center under a normal load of 5 N with a rotational speed of 60 rpm and sliding time of 10 min. The friction coefficient and wear volume loss were examined to evaluate the effect of HPT on wear resistance. The results show that the samples processed by HPT have lower average values for the COF and wear volume loss than that of unprocessed samples.

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Jittraporn-Thermec2020-TGL - Accepted Manuscript
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Jittraporn-Manuscripts Thermec2020-HPT-AlSiFe-TGL - Other
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More information

Accepted/In Press date: 16 April 2020
e-pub ahead of print date: 5 January 2021
Keywords: Aluminium Silicon based alloy, high-pressure torsion (HPT), microstructure, friction coefficient, wear resistance

Identifiers

Local EPrints ID: 439625
URI: http://eprints.soton.ac.uk/id/eprint/439625
ISSN: 1662-9752
PURE UUID: 0fd1ee60-946a-496d-995b-3b5ce16df22b
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 28 Apr 2020 16:35
Last modified: 17 Mar 2024 02:55

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Contributors

Author: Jittraporn Wongsa-Ngam
Author: Jie Xu
Author: Chakkrist Phongphisutthinan

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