Effect of Fe Intermetallics on Microstructure and Properties of Al-7Si Alloys

• DOI: 10.1007/s11837-019-03444-5
• Publication Date: 2019-03-25T15:02:45Z
• Authors: James Mathew; Guillaume Remy; Mark A. Williams; Fengzai Tang; Prakash Srirangam
• Keywords: Brittleness; Tensile testing; Elongation

The present work deals with the effect of iron intermetallics on microstructure and mechanical properties Al-7% Si alloys. Two different additions were made, 0.6% Fe 2% Fe, to study Al-Si Microstructure property correlations carried out using SEM-EDS tensile testing results show that rise in content significantly increased average size, thickness number intermetallic particles Nano-indentation shows are too brittle compared primary aluminium. Moreover, hardness Young's modulus higher than those Tensile test there is no significant difference strength levels between Al-7%Si Al-7Si-0.6Fe However, an increase from resulted a decrease elongation Two-dimensional SEM studies suggest needle-shaped β-phase formed because amounts could be reason for early failure alloy. To further understand iron-containing alloys, fractured specimens studied 3D x-ray tomography technique. XCT alloy was not mainly due breaking particles, but morphology particle-matrix interface debonding. long, sharp-edged platelets 3D, which act as stress raisers crack initiation propagation along interphase.