About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Bulk Metallic Glasses XVII
|
Presentation Title |
Corrosion Behavior of SAM2×5 Amorphous Steel / Crystalline <i>in situ</i> Composite |
Author(s) |
Nada F. Qari, Arash Yazdani, Darren Dewitt, Javier E. Garay, Olivia A. Graeve |
On-Site Speaker (Planned) |
Nada F. Qari |
Abstract Scope |
SAM2×5 is an Fe-based bulk metallic glass with a chemical composition of Fe<sub>49.7</sub>Cr<sub>17.7</sub>Mn<sub>1.9</sub>Mo<sub>7.4</sub>W<sub>1.6</sub>B<sub>15.2</sub>C<sub>3.8</sub>Si<sub>2.4</sub> and a significantly higher corrosion resistance compared to stainless steel. We have prepared dense samples of this alloy using spark plasma sintering at varying temperatures ranging from 630 to 675°C and whose crystallinity percentages were 21 wt.% to 82 wt.%. The corrosion rate of specimens was measured in a 3.5% NaCl solution. It was found that by enhancing sintering temperature and consequently crystallinity percent, the corrosion rate increased from 7.47 mpy (miles per year) to 15.75 mpy. Results of scanning electron microscopy show that there is no significant microstructural change in the amorphous matrix after corrosion test, while the crystalline regions are severely corroded. Although the corrosion rate increases with increasing percent crystallinity, it is still considerably lower than the control stainless steel sample which yields a corrosion rate of 28.93 mpy under the same conditions. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |