Heterogeneous lamella structure unites ultrafine-grain strength with coarse-grain ductility
Abstract
For centuries it has been a challenge to avoid strength–ductility trade-off, which is especially problematic for ultrastrong ultrafine-grained metals. Here we evade this trade-off dilemma by architecting a heterogeneous lamella structure, i.e., soft micrograined lamellae embedded in hard ultrafine-grained lamella matrix. The heterogeneous deformation of this previously unidentified structure produces significant back-stress hardening in addition to conventional dislocation hardening, rendering it higher strain hardening than coarse-grained metals. The high back-stress hardening makes the material as strong as ultrafine-grained metals and as ductile as coarse-grained metals.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 09, 2015
- Source ID
- 10.1073/pnas.1517193112
Entities
People
- Fuping Yuan
- Guilin Wu
- Muxin Yang
- Xiaolei Wu
- Xiaoxu Huang
- Y.T. Zhu
- Yujie Wei
Organizations
- Army Research Office
- Chinese Academy of Sciences
- Chongqing University
- Ministry of Science and Technology of the People's Republic of China
- Nanjing University of Science and Technology
- National Natural Science Foundation of China
- North Carolina State University