Dry sliding wear behaviour of thixoformed hypoeutectic Al-Si-Cu alloy with different amounts of magnesium

K. S. Alhawari, Mohd. Zaidi Omar, Mariyam Jameelah Ghazali, M. S. Salleh, M. N. Mohammed

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

In this study, the dry sliding wear characteristics of Al-6Si-3Cu-(0.3-2) Mg-aluminium alloys produced by the thixoforming process were examined. The cooling slope technique was employed to produce feedstock alloys before they were thixoformed at 50% liquid fraction. A pin-on-disc rig was used to carry out the wear tests at 50 N load, 1 m/s speed and 9 km distance. The results revealed that adding magnesium to Al-Si-Cu alloy led to precipitate Al5Cu2Mg3Si5 and Mg2Si intermetallic phases. The platelet β-Al5FeSi was transformed to a Chinese script π-Al8Mg3FeSi6 phase with the addition of magnesium. The thixoformed alloys showed a fine globular primary phase microstructure surrounded by uniformly distributed silicon and refined fragmented intermetallic phases. Moreover, in comparison with alloys produced by the conventional casting method, the morphology and size of the primary Mg2Si particles were modified, and the Chinese script morphology of π-Al.8Mg3FeSi6 changed to a compact shape. The hardness of the thixoformed Al-Si-Cu alloys increased continuously with the increase in magnesium content. The wear resistance of the thixoformed alloys improved with the addition of magnesium content up to 1.5%, above which the trend reversed. The dominant wear mechanism was found to be a combination of abrasion and adhesion in the low-Mg alloys and delamination with some abrasion in the high-Mg alloy.

Original languageEnglish
Pages (from-to)519-531
Number of pages13
JournalComposite Interfaces
Volume23
Issue number6
DOIs
Publication statusPublished - 23 Jul 2016

Fingerprint

Magnesium
sliding
magnesium
Wear of materials
abrasion
Abrasion
Intermetallics
intermetallics
lead alloys
Lead alloys
wear tests
Silicon
Platelets
platelets
wear resistance
Delamination
aluminum alloys
Feedstocks
Wear resistance
Precipitates

Keywords

  • Al-Si-Cu alloy
  • magnesium
  • thixoforming
  • Wear properties

ASJC Scopus subject areas

  • Ceramics and Composites
  • Surfaces, Coatings and Films
  • Physics and Astronomy(all)

Cite this

Dry sliding wear behaviour of thixoformed hypoeutectic Al-Si-Cu alloy with different amounts of magnesium. / Alhawari, K. S.; Omar, Mohd. Zaidi; Ghazali, Mariyam Jameelah; Salleh, M. S.; Mohammed, M. N.

In: Composite Interfaces, Vol. 23, No. 6, 23.07.2016, p. 519-531.

Research output: Contribution to journalArticle

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AB - In this study, the dry sliding wear characteristics of Al-6Si-3Cu-(0.3-2) Mg-aluminium alloys produced by the thixoforming process were examined. The cooling slope technique was employed to produce feedstock alloys before they were thixoformed at 50% liquid fraction. A pin-on-disc rig was used to carry out the wear tests at 50 N load, 1 m/s speed and 9 km distance. The results revealed that adding magnesium to Al-Si-Cu alloy led to precipitate Al5Cu2Mg3Si5 and Mg2Si intermetallic phases. The platelet β-Al5FeSi was transformed to a Chinese script π-Al8Mg3FeSi6 phase with the addition of magnesium. The thixoformed alloys showed a fine globular primary phase microstructure surrounded by uniformly distributed silicon and refined fragmented intermetallic phases. Moreover, in comparison with alloys produced by the conventional casting method, the morphology and size of the primary Mg2Si particles were modified, and the Chinese script morphology of π-Al.8Mg3FeSi6 changed to a compact shape. The hardness of the thixoformed Al-Si-Cu alloys increased continuously with the increase in magnesium content. The wear resistance of the thixoformed alloys improved with the addition of magnesium content up to 1.5%, above which the trend reversed. The dominant wear mechanism was found to be a combination of abrasion and adhesion in the low-Mg alloys and delamination with some abrasion in the high-Mg alloy.

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