Ductility and strain hardening in gradient and lamellar structured materials

SCRIPTA MATERIALIA

卷:186

Article

Wu, Xiaolei^1,2  Zhu, Yuntian³  Lu, Ke⁴ 

[1] Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100190, Peoples R China

[3] North Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA

[4] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China

关键词: Ductility;    Strain hardening;    Gradient structure;    Lamellar structure;    Heterogeneous structured materials;   

DOI  :  10.1016/j.scriptamat.2020.05.025

来源: Elsevier

【 摘 要 】

Low ductility has long been the bottleneck especially at high strength in metallic structured materials due to conventional forest hardening having little to no effect. Hetero-structuring is an emerging strategy producing superior strength and ductility combination. This Viewpoint article delineates mechanisms for strain hardening and plastic deformation in gradient and lamellar structured materials. Both have typical trans-scale grain hierarchy, leading to sharp mechanical incompatibility and consequent strain gradient at hetero-interfaces during plastic deformation. This induces heterogeneous deformation-induced hardening, along with recovered forest hardening, jointly to improve ductility. The heterogeneous deformation-related deformation physics sheds lights on the path to designing novel heterostructures particularly for large ductility at high strength. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free