Nanotwinning-assisted dynamic recrystallization at high strains and strain rates

Grain refinement is a widely sought-after feature of many metal production processes and frequently involves a process of recrystallization. Some processing methods use very high strain rates and high strains to refine the grain structure into the nanocrystalline regime. However, grain refinement pr...

Full description

Saved in:
Bibliographic Details
Published in:Nature materials 2022-07, Vol.21 (7), p.786-794
Main Authors: Tiamiyu, Ahmed A, Pang, Edward L, Chen, Xi, LeBeau, James M, Nelson, Keith A, Schuh, Christopher A
Format: Article
Language:English
Subjects:
Chemistry
Deformation
Dictionaries
Dynamic recrystallization
Electron backscatter diffraction
Grain boundaries
Grain refinement
Grain size
Grain structure
High strain rate
Materials Science
Metals
Microparticles
Nanocrystals
Particle impact
Particle size
Physics
Scanning transmission electron microscopy
Strain
Temperature
Transmission electron microscopy
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Grain refinement is a widely sought-after feature of many metal production processes and frequently involves a process of recrystallization. Some processing methods use very high strain rates and high strains to refine the grain structure into the nanocrystalline regime. However, grain refinement processes are not clear in these extreme conditions, which are hard to study systematically. Here, we access those extreme conditions of strain and strain rate using single copper microparticle impact events with a laser-induced particle impact tester. Using a combined dictionary-indexing electron backscatter diffraction and scanning transmission electron microscopy approach for postmortem characterization of impact sites, we systematically explore increasing strain levels and observe a recrystallization process that is facilitated by nanotwinning, which we term nanotwinning-assisted dynamic recrystallization. It achieves much finer grain sizes than established modes of recrystallization and therefore provides a pathway to the finest nanocrystalline grain sizes through extreme straining processes.
ISSN:1476-1122
1476-4660
DOI:10.1038/s41563-022-01250-0