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Ductile crystalline-amorphous nanolaminates.

Yinmin Wang¹, Ju Li, Alex V Hamza

¹Nanoscale Synthesis and Characterization Laboratory, Chemistry, Materials, and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA. ymwang@llnl.gov

Proceedings of the National Academy of Sciences of the United States of America

|June 27, 2007

Summary

Researchers developed copper/copper-zirconium glass nanolaminates with exceptional tensile ductility. These advanced materials overcome brittleness in metallic glasses, offering enhanced strength and plasticity for engineering applications.

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Microfluidic Preparation of Liquid Crystalline Elastomer Actuators

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Published on: May 20, 2018

Area of Science:

Materials Science
Nanotechnology
Mechanical Engineering

Background:

Bulk metallic glasses exhibit limited room-temperature plasticity due to strain softening and shear localization, leading to brittleness.
Incorporating metallic glasses into engineering materials often results in a loss of useful tensile ductility.
Conventional crystalline-crystalline nanolaminates typically show very low tensile ductility (<2%).

Purpose of the Study:

To investigate the tensile ductility of crystalline copper/copper-zirconium glass nanolaminates.
To understand the mechanisms behind enhanced plasticity in these nanolaminate structures.
To explore the potential of nanoscale metallic glass layers in improving material properties.

Main Methods:

Fabrication of nanocrystalline-amorphous nanolaminates.
Tensile testing to evaluate mechanical properties, including flow stress and elongation to failure.
Transmission electron microscopy (TEM) for structural analysis.
Atomistic simulations to probe deformation mechanisms.

Main Results:

The nanolaminates demonstrated exceptional tensile ductility (13.8 +/- 1.7% elongation) and high flow stress (1.09 +/- 0.02 GPa).
Exhibited nearly elastic-perfectly plastic behavior without necking.
TEM and simulations revealed that nanoscale glassy layers suppressed shear banding instability and acted as dislocation sinks.
Amorphous-crystal interfaces showed unique inelastic shear transfer characteristics, unlike grain boundaries.

Conclusions:

Nanoscale metallic glass layers can effectively engineer the plasticity of crystalline materials.
These nanolaminates offer a significant improvement in strength and ductility compared to conventional materials.
The findings open new avenues for designing advanced materials with enhanced mechanical performance.