High-Strength and High-Ductility Nanostructured and Amorphous Metallic Materials

The development of materials with dual properties of high strength and high ductility has been a constant challenge since the foundation of the materials science discipline. The rapid progress of nanotechnology in recent decades has further brought this challenge to a new era. This Research News hig...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2014-08, Vol.26 (31), p.5518-5524
Main Authors: Kou, Hongning, Lu, Jian, Li, Ying
Format: Article
Language:English
Subjects:
Amorphous materials
bulk metallic glasses
Ductility
High strength
Metallic glasses
Nanomaterials
Nanostructure
nanotwins
Strain
strain non-localization
Strategy
structural nanomaterials
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Summary:The development of materials with dual properties of high strength and high ductility has been a constant challenge since the foundation of the materials science discipline. The rapid progress of nanotechnology in recent decades has further brought this challenge to a new era. This Research News highlights a few newly developed strategies to optimize advanced nanomaterials and metallic glasses with exceptional dual mechanical properties of high strength and high ductility. A general concept of strain non‐localization is presented to describe the role of multiscale (i.e., macroscale, microscale, nanoscale, and atomic scale) heterogeneities in the ductility enhancement of materials reputed to be intrinsically brittle, such as nanostructured metallic materials and bulk metallic glasses. These nanomaterials clearly form a new group of materials that display an extraordinary relationship between yield strength and the uniform elongation with the same chemical composition. Several other examples of nanomaterials such as those reinforced by nanoprecipitates will also be described. Different toughening strategies of nanostructured and amorphous metallic materials based on the strain non‐localization concept are summarized from macroscopic to atomic scale, including the first experimental illustration of three‐dimensional hierarchical twins (see figure). The newly designed structure provides a promising route to further enhance the mechanical performance and is believed to be effective in a variety of metallic materials.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.201401595