Effect of strontium on the microstructure and mechanical properties of aluminium ADC12/Nano-SiC composite with Al-5TiB grain refiner by stir casting method

Anne Zulfia, Lely Tri Putriana

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The effects of Sr addition on mechanical properties and microstructure of aluminium ADC12/Nano-SiC composites produced by stir casting have been investigated. The addition of Sr into ADC12 matrix was varied from 0.01 to 0.03 wt% and the other elements added were Al-5TiB as a grain refiner and Mg as a wetting agent. It was found that the phases present in composites analysed by Scanning Electron Microscope link to Energy Dispersive Spectra was Mg 2 Si primary, Mg 2 Si binary, β-Al 5 FeSi and Al 2 Cu respectively. The results show that Sr modifies acicular/plate like of Al-Si eutectic into fibrous. Sr also reduced slightly the average size of blocky Mg 2 Si primary and changed Chinese script of Mg 2 Si binary into polyhedral or finer fibrous shape. The modification effect plays role in improving mechanical properties. The highest optimum UTS and elongation were obtained at composites with 0.025 wt% Sr with the value of 292 MPa and 1.88% respectively, while the SDAS was 11.85 μm. The hardness and wear rate of all composites were relatively no changed.

Original languageEnglish
Article number074002
JournalMaterials Research Express
Volume6
Issue number7
DOIs
Publication statusPublished - 10 Apr 2019

Keywords

  • Al-5TiB
  • aluminum ADC12
  • nano-SiC reinforcement
  • Sr modifier

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