Evaluation of the microstructure and dry sliding wear behaviour of thixoformed A319 aluminium alloy

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

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The microstructural and dry sliding wear characteristics of thixoformed A319 aluminium alloy are investigated and compared with those of a conventional mould cast alloy. Cooling slope technique was employed to produce thixoforming feedstock with pouring temperatures between 620 and 640. °C, plate lengths between 300 and 500. mm and 60° inclined angle. The optimum rheocast alloy was thixoformed at 50% liquid fraction. A pin-on-disc tribometer was used to conduct tribological tests under dry sliding conditions at 1.0. m/s sliding speed, under three loads of 10, 50 and 100. N and 9. km distance. The dendritic microstructure in the conventionally cast alloy transforms into a globular or rosette-like microstructure using cooling slope method with optimum conditions of 630. °C pouring temperature and 400. mm plate length, which gives a grain size of 34. μm and shape factor of 0.75. Thixoformed alloy microstructure shows a fine globular primary phase, fragmented and uniformly distributed silicon and intermetallic compounds. Also the thixoformed alloy exhibits improved wear resistance and lower friction coefficient in comparison to the cast alloy particularly at low load. The dominant wear mechanism is a combination of abrasive and adhesive wear at low load and plastic deformation followed by adhesive wear at high load.

Original languageEnglish
Pages (from-to)169-180
Number of pages12
JournalMaterials and Design
Volume76
DOIs
Publication statusPublished - 5 Jul 2015

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Aluminum alloys
Wear of materials
Microstructure
Adhesives
Silicon Compounds
Silicon compounds
Cooling
Abrasives
Feedstocks
Intermetallics
Wear resistance
Plastic deformation
Friction
Temperature
Liquids

Keywords

  • A319
  • Cooling slope casting
  • Thixoforming
  • Wear properties

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

Cite this

Evaluation of the microstructure and dry sliding wear behaviour of thixoformed A319 aluminium alloy. / Alhawari, K. S.; Omar, Mohd. Zaidi; Ghazali, Mariyam Jameelah; Salleh, M. S.; Mohammed, M. N.

In: Materials and Design, Vol. 76, 05.07.2015, p. 169-180.

Research output: Contribution to journalArticle

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