About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Advances in Refractory High Entropy Alloys and Ceramics
|
| Presentation Title |
Superior Spall Strength and Toughness in Hf₂₆Nb₂₀Ti₃₁V₂₃ Relative to Previously Tested Refractory Multi-Component Alloys |
| Author(s) |
Ayden Caulder, Gary Simpson, Joseph T. Mckeown, Janith Wanni, Saryu Fensin |
| On-Site Speaker (Planned) |
Ayden Caulder |
| Abstract Scope |
High-entropy alloys (HEAs) offer the potential to combine high strength and ductility, but many high-strength compositions exhibit brittle behavior, particularly under dynamic loading. Here, we examine the spall behavior of a refractory HEA, Hf₂₆Nb₂₀Ti₃₁V₂₃, using plate-impact experiments at controlled peak stresses. At a peak stress of 5.4 GPa, the alloy exhibits a spall strength of 4.0 GPa, which is high relative to reported values for many metallic systems, including other HEAs. Post-mortem microscopy reveals that damage evolution is characterized by isolated void nucleation along grain boundaries, delaying coalescence and inhibiting the formation of a continuous spall plane. The equiaxed grain structure further increases resistance to void linkage. These results demonstrate that this refractory HEA exhibits exceptional resistance to dynamic tensile failure, highlighting the potential for HEAs to overcome the strength–brittleness tradeoff under shock loading. |