| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Entropy Alloys IX: Alloy Development and Properties
|
| Presentation Title |
High-strain-rate 2000% Superplasticity in A
nanostructured High-entropy Alloy |
| Author(s) |
Hyoung Seop Kim, Nhung Thi-Cam Nguyen, Peyman Asghari-Rad, Praveen Sathiyamoorthi, Alireza Zargaran, Chong Soo Lee |
| On-Site Speaker (Planned) |
Hyoung Seop Kim |
| Abstract Scope |
Superplasticity describes a material’s ability to sustain large plastic deformation in the form of a tensile elongation to over 400% of its original length, but is generally observed only at a low strain rate (~10^−4 s^−1), which results in long processing times that are economically undesirable for mass production. Superplasticity at high strain rates in excess of 10^−2 s^−1, required for viable industry-scale application, has usually only been achieved in low-strength aluminum and magnesium alloys. Here, we present a superplastic elongation to 2000% of the original length at a high strain rate of 5×10^−2 s^−1 in an Al9(CoCrFeMnNi)91 (at%) high entropy alloy nanostructured using high-pressure torsion. The high-pressure torsion induced grain refinement in the multi-phase alloy combined with limited grain growth during hot plastic deformation enables high strain rate superplasticity through grain boundary sliding accommodated by dislocation activity. |
| Proceedings Inclusion? |
Planned: |