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Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Plasticity

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Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...

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The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...

Plastic Behavior

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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and reloaded.

Plastic Deformations

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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...

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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their original...

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A Fabrication Method for Highly Stretchable Conductors with Silver Nanowires

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Near-perfect elastoplasticity in pure nanocrystalline copper.

Yannick Champion¹, Cyril Langlois, Sandrine Guérin-Mailly

¹Centre d'Etudes de Chimie Métallurgique-CNRS, 15 rue Georges Urbain, 94407 Vitry-sur-Seine, France. yannick.champion@glvt-cnrs.fr

Science (New York, N.Y.)

|April 12, 2003

Summary

Pure nanocrystalline copper exhibits unique elastoplastic behavior, showing Newtonian flow without work-hardening or necking. This discovery advances understanding of nanocrystalline materials and their industrial applications.

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Area of Science:

Materials Science
Mechanical Engineering
Nanotechnology

Background:

Ductile metals typically exhibit work-hardening and necking during plastic deformation at room temperature, leading to failure.
Understanding the mechanical behavior of nanocrystalline materials is crucial for developing advanced engineering applications.

Purpose of the Study:

To investigate the plastic deformation behavior of pure nanocrystalline copper.
To determine if nanocrystalline copper exhibits work-hardening and neck formation under tensile stress.
To explore the potential for commercial applications of nanocrystalline materials.

Main Methods:

Tensile testing was performed on fully dense, large-scale bulk nanocrystalline copper samples.
Mechanical properties, including work-hardening and neck formation, were analyzed.

Main Results:

Pure nanocrystalline copper displayed near-perfect elastoplastic behavior.
Newtonian flow was observed, with a notable absence of work-hardening.
No neck formation was detected during the tensile tests.

Conclusions:

Nanocrystalline copper possesses unique mechanical properties distinct from conventional ductile metals.
The absence of work-hardening and necking in nanocrystalline copper offers new possibilities for material processing.
These findings provide a foundation for commercial technologies in plastic and superplastic formation of nanocrystalline materials.