| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advancements in Lightweight Composites, Materials & Alloys
|
| Presentation Title |
Strengthening In-Situ Fe-Aluminide Reinforced Aluminum Matrix Composites Through an Optimized Twostep Thermal Processing Method; Sintering and Uniaxial Forging |
| Author(s) |
Tapabrata Maity |
| On-Site Speaker (Planned) |
Tapabrata Maity |
| Abstract Scope |
In-situ Fe-aluminide (FeAl) reinforced Al-matrix composites (Al/FeAl) were fabricated by a twostep thermal processing method: sintering (900°C/1h), and uniaxial forging (400°C, 20%) to improve their strength-ductility balance. FeAl reinforcements grew directly within Al matrix during sintering due to reaction with Fe2O3 nanoparticles. Forging improves the composites strain hardening ability, as shown by lower strain rate sensitivity (m=0.035) and higher strain rate recovery rate (0.115±0.04). Microscopic analysis shows levels of beneficial dislocations (ρG=1×10^15 m^-2) near the grain boundaries (GBs) and the junctions in the highly textured Al matrix. This strong deformation texture (Bras {110}<112> and Goss {110}<001>2) in Al matrix, however, induce strong resistance to plastic deformation. Nanoindentation suggests that activities of GB-dislocation interactions help dislocation accumulation (V*~ 42b^3) at Al matrix boundaries during straining. This thermally activated process promotes dislocations ρG to redistribute and sustain larger strains. Achieving both processes simultaneously leads to better resistance to failure. |