Ultrahigh high-strain-rate superplasticity in a nanostructured high-entropy alloy

Nhung Thi-Cam Nguyen, Peyman Asghari-Rad, Praveen Sathiyamoorthi, Alireza Zargaran, Chong Soo Lee and Hyoung Seop Kim ()
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Nhung Thi-Cam Nguyen: Pohang University of Science and Technology (POSTECH)
Peyman Asghari-Rad: Pohang University of Science and Technology (POSTECH)
Praveen Sathiyamoorthi: Pohang University of Science and Technology (POSTECH)
Alireza Zargaran: Pohang University of Science and Technology (POSTECH)
Chong Soo Lee: Pohang University of Science and Technology (POSTECH)
Hyoung Seop Kim: Pohang University of Science and Technology (POSTECH)

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract 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 aluminium 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.

Date: 2020
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DOI: 10.1038/s41467-020-16601-1

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