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

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 Mg2Si primary, Mg2Si binary, β-Al5FeSi and Al2Cu 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 Mg2Si primary and changed Chinese script of Mg2Si 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.

Mechanical and tribological properties of nano-sized Al2O3 particles on ADC12 alloy composites with Strontium modifier produced by stir casting method

“…The addition of 5% magnesium was derived ADC12 alloy ternary system from Al-Si-Cu into Al-Si-Mg. As a result, the intermetallic compound of Mg 2 Si was emerged and formed in primary, binary, and ternary structure during as cast, as shown in figure 6b-f, which lead to improve mechanical properties [19,22]. This seems to be associated with quasi-binary Al-Mg2Si derived from the Al-Mg-Si ternary diagram [23].…”

Effect of Al–10Sr Addition on Tensile and Wear Properties of 20 wt%SiC/A359 Composites

“…Zulfia. et al [ 23 ] concluded that Sr content had a negligible impact on the hardness and wear rate of ADC12/0.03% volume fraction (vf) Nano‐SiC.…”