About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
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Heterostructured and Gradient Materials (HGM IV): Tailoring Heterogeneity for Superior Properties
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Presentation Title |
Unique Hall-petch Relation in Harmonic Structure Materials |
Author(s) |
Kei Ameyama |
On-Site Speaker (Planned) |
Kei Ameyama |
Abstract Scope |
The Harmonic Structure (HS) design has been applied to pure metals and alloys via SPD powder metallurgy process. At a macro-scale, the harmonic structure materials exhibited significantly better combination of strength and ductility, as compared to their homogeneous microstructure counterparts. This behavior is essentially related to the ability of the HS to promote a large strain hardening and uniform distribution of strain during plastic deformation, leading to improved mechanical properties by avoiding or delaying localized plastic instability. Moreover, HS materials showed a new extra hardening Hall-Petch relationship behavior in the grain size range larger than several tens microns. This unique phenomenon is considered to be due to strain hardening which started prior to 0.2% strain. Such unique and outstanding mechanical properties of HS materials are attributed to the synergy effects of nano and macro scale structures. |
Proceedings Inclusion? |
Planned: |