Ultrahigh high-strain-rate superplasticity in a nanostructured high-entropy alloy
SCIE
SCOPUS
- Title
- Ultrahigh high-strain-rate superplasticity in a nanostructured high-entropy alloy
- Authors
- NGUYEN, THI CAM NHUNG; Asghari-Rad, Peyman; Sathiyamoorthi, Praveen; Zargaran, Alireza; Lee, Chong Soo; Kim, Hyoung Seop
- Date Issued
- 2020-06
- Publisher
- NATURE PUBLISHING GROUP
- 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 (similar to 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 5x10(-2)s(-1) in an Al-9(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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/107225
- DOI
- 10.1038/s41467-020-16601-1
- ISSN
- 2041-1723
- Article Type
- Article
- Citation
- NATURE COMMUNICATIONS, vol. 11, no. 1, 2020-06
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- There are no files associated with this item.
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