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Related Concept Videos

Frictional Force01:07

Frictional Force

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When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
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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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Dry Friction01:30

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Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Characteristics of Dry Friction01:21

Characteristics of Dry Friction

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Dry friction occurs when two solid surfaces slide against each other without any lubrication or fluid present. It causes resistance when pushing objects along a surface, like a gardener pushing a wheelbarrow. The force applied to move the cart causes dry friction between the wheel and the ground.
Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...
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Static and Kinetic Frictional Force01:05

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One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
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Preparation and High-temperature Anti-adhesion Behavior of a Slippery Surface on Stainless Steel
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Friction and solid-solid adhesion on complex metallic alloys.

Jean-Marie Dubois1, Esther Belin-Ferré2

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Science and Technology of Advanced Materials
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Summary

Stable quasicrystals in aluminum-copper-iron (Al-Cu-Fe) alloys exhibit reduced friction and adhesion. This property, linked to low surface energy and anisotropic friction, enables various technological applications.

Keywords:
adhesioncompositesfrettingfrictionsurface energytribology

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Area of Science:

  • Materials Science
  • Tribology
  • Solid-State Physics

Background:

  • The discovery of stable quasicrystals in the Al-Cu-Fe system in 1987 led to the development of low-friction coatings.
  • These complex metallic alloys (CMAs) have found potential and commercial applications due to their unique properties.

Purpose of the Study:

  • To review the characteristics of CMAs that contribute to reduced friction and adhesion.
  • To explore the relationship between material properties and tribological behavior.

Main Methods:

  • Review of scientific literature over the past two decades.
  • Analysis of the link between surface energy, Fermi energy pseudo-gap, and translational symmetry in CMAs.

Main Results:

  • CMAs exhibit significantly lower surface energy, contributing to reduced solid-solid adhesion.
  • Friction in CMAs is anisotropic, influenced by the degree of translational symmetry.

Conclusions:

  • The unique electronic structure and anisotropic properties of CMAs are key to their low-friction behavior.
  • Understanding these characteristics is crucial for advancing applications of quasicrystalline materials.