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Super plastic bulk metallic glasses at room temperature.

Yan Hui Liu¹, Gang Wang, Ru Ju Wang

¹Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China.

Science (New York, N.Y.)

|March 10, 2007

Summary

Researchers achieved super plasticity at room temperature in zirconium copper nickel aluminum (ZrCuNiAl) metallic glasses by carefully controlling composition and elastic moduli, overcoming typical brittleness. Microstructure analysis revealed hard regions within soft regions, enabling significant deformation.

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Area of Science:

Materials Science
Metallurgy
Solid Mechanics

Background:

Bulk metallic glasses typically exhibit poor plasticity, limiting their applications.
Brittleness is a major challenge in metallic glass research and development.

Purpose of the Study:

To achieve super plasticity at room temperature in ZrCuNiAl metallic glasses.
To understand the deformation mechanisms responsible for enhanced plasticity.

Main Methods:

Synthesizing ZrCuNiAl metallic glasses with controlled composition.
Analyzing microstructures to identify structural features related to plasticity.
Investigating the relationship between elastic moduli and super plasticity.

Main Results:

Super plasticity was achieved at room temperature in ZrCuNiAl metallic glasses.
Microstructural analysis revealed a unique structure of hard regions surrounded by soft regions.
The material exhibited a true strain exceeding 160%.

Conclusions:

The composition-controlled microstructure is key to achieving super plasticity in metallic glasses.
This finding offers a potential solution to the brittleness problem in metallic glasses.
The study provides insights into the deformation mechanisms of super plastic metallic glasses.