Thixoformability and microstructural evolution of Al-Si-Cu Alloys

S. Samat, Mohd. Zaidi Omar, Mohamed Intan Fadhlina, Zainuddin Sajuri, A. M. Aziz, M. A.M. Arif

Research output: Contribution to journalConference article

Abstract

Commercial aluminium casting alloys such as those from Al-Si-Cu family are widely used in the automotive industry because of their combinations of good fluidity and mechanical strength. Semisolid metal processing utilizing these alloys thus far has given products with better mechanical properties over those produced via traditional metal forming processes. However, there is still demand to widen the range of suitable alloys for the semisolid processing. One way of achieving this is by modifying the alloy compositions. Hence, modified alloys under this family were formulated and assessed. This paper reports results of the thermodynamics evaluation and microstructural evolution for one of these modified alloys, and comparing them with that of the commercially available A319 alloy. Data from Differential Scanning Calorimetry heating curves along the semi-solid range of the alloys were analysed and used as an approximation in determining their thixoformability. The work had demonstrated that the selected modified alloy is suitable for semisolid processing by having wider working window temperature, lower temperature sensitivity of liquid fraction and adequate solidification range. Both alloys, the modified and the commercial A319 alloys, were also successfully thixoformed and their microstructural features and quantitative measures obtained and compared. They both had given the shape factor and solid globule size within the acceptable values for the semisolid processing, i.e. of around 0.7-0.8 and 50-60 μm, respectively. However, in short, the modified alloy has shown better thixoformability characteristics than the commercial alloy.

Original languageEnglish
Pages (from-to)1161-1168
Number of pages8
JournalMaterials Today: Proceedings
Volume17
DOIs
Publication statusPublished - 1 Jan 2019
Event6th International Conference on Recent Advances in Materials, Minerals and Environment, RAMM 2018 - Penang, Malaysia
Duration: 27 Nov 201829 Nov 2018

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Microstructural evolution
Processing
Aluminum castings
Fluidity
Metal forming
Automotive industry
Strength of materials
Solidification
Differential scanning calorimetry
Metals

Keywords

  • Al-Si-Cu alloy
  • Microstructure
  • Semisolid Processing
  • Thixoformability

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Thixoformability and microstructural evolution of Al-Si-Cu Alloys. / Samat, S.; Omar, Mohd. Zaidi; Intan Fadhlina, Mohamed; Sajuri, Zainuddin; Aziz, A. M.; Arif, M. A.M.

In: Materials Today: Proceedings, Vol. 17, 01.01.2019, p. 1161-1168.

Research output: Contribution to journalConference article

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