Atomic faulting induced exceptional cryogenic strain hardening in gradient cell–structured alloy

Pan, Qingsong; Yang, Muxin; Feng, Rui; Chuang, Andrew Chihpin; An, Ke; Liaw, Peter K.; Wu, Xiaolei; Tao, Nairong; Lu, Lei

doi:10.1126/science.adj3974

Atomic faulting induced exceptional cryogenic strain hardening in gradient cell–structured alloy

Journal Article · Thu Sep 14 00:00:00 EDT 2023 · Science

DOI:https://doi.org/10.1126/science.adj3974· OSTI ID:2204561

^[1]; ^[2]; ^[3]; ^[4]; ^[3]; ^[5]; ^[2]; Tao, Nairong ^[1]; ^[1]

Chinese Academy of Sciences (CAS), Shenyang (China)
Chinese Academy of Sciences (CAS), Beijing (China)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
University of Tennessee, Knoxville, TN (United States)

Coarse-grained materials are widely accepted to display the highest strain hardening and the best tensile ductility. We experimentally report an attractive strain hardening rate throughout the deformation stage at 77 kelvin in a stable single-phase alloy with gradient dislocation cells that even surpasses its coarse-grained counterparts. Contrary to conventional understanding, the exceptional strain hardening arises from a distinctive dynamic structural refinement mechanism facilitated by the emission and motion of massive multiorientational tiny stacking faults (planar defects), which are fundamentally distinct from the traditional linear dislocation–mediated deformation. In conclusion, the dominance of atomic-scale planar deformation faulting in plastic deformation introduces a different approach for strengthening and hardening metallic materials, offering promising properties and potential applications.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); US Army Research Office (ARO); National Science Foundation (NSF); National Science Foundation of China (NSFC)

Grant/Contract Number:: AC05-00OR22725; AC02-06CH11357

OSTI ID:: 2204561

Alternate ID(s):: OSTI ID: 2404976

Journal Information:: Science, Journal Name: Science Journal Issue: 6667 Vol. 382; ISSN 0036-8075

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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