About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Lightweight Composites, Materials, and Alloys
|
| Presentation Title |
Effects of Plate-Shaped Eutectic Fe-rich Intermetallics with Varying Mn/Fe Atomic Ratios on the Mechanical Properties and Electrical Conductivity of a Low-Fe Al-Si Casting Alloy |
| Author(s) |
Gihoon Moon, Brajendra Mishra |
| On-Site Speaker (Planned) |
Gihoon Moon |
| Abstract Scope |
Controlling the Mn addition is an important factor in tailoring the morphology and characteristics of Fe-rich intermetallics, although at the expense of conductivity of Al-Si alloys. This study was focused on the formation and fracture behavior of plate-shaped eutectic Fe-rich intermetallics with the varying of Mn/Fe atomic ratios, and their influence on the mechanical properties and electrical conductivity of low-Fe Al-Si alloys. The higher Mn/Fe ratios in plate-shaped eutectic Fe-rich intermetallics alleviated stress concentration and would not cause crack initiation at the interfaces, resulting in enhanced strength and elongation. Nano-indentation measurements confirmed that the Young’s modulus and hardness of plate-shaped Fe-rich intermetallics increased as the Mn/Fe atomic ratio increased. However, electrical conductivity was predominantly governed by the solute content in the Al matrix and tended to decrease with increasing Mn addition. These results provide the guideline for overcoming trade off relationship of mechanical properties and conductivity of Al-Si alloys. |