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Related Concept Videos

Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

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...
Strain Energy01:13

Strain Energy

Strain energy is a fundamental concept in the field of materials science and structural engineering, describing the energy absorbed by a material or structure when it is deformed under load.
Consider a rod that is fixed at one end and subjected to an axial force at the free end. This axial force induces stress within the rod, leading to its elongation. As the axial force increases, so does the elongation of the rod, illustrating a direct relationship between the force applied and the resulting...
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
Phase Transitions02:31

Phase Transitions

Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Solid-solid phase transitions in Fe nanowires induced by axial strain.

Luis Sandoval1, Herbert M Urbassek

  • 1Fachbereich Physik und Forschungszentrum OPTIMAS, Universität Kaiserslautern, Erwin-Schrödinger-Strasse, D-67663 Kaiserslautern, Germany.

Nanotechnology
|July 22, 2009
PubMed
Summary
This summary is machine-generated.

Axial strain induces a solid-solid phase transition in iron nanowires from body-centered cubic (bcc) to close-packed structures. This transformation occurs at specific temperatures below the bulk transition point.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Materials Science

Background:

  • Iron undergoes phase transitions, notably the martensite-austenite transformation.
  • Nanowires exhibit unique mechanical and phase transition properties compared to bulk materials.

Purpose of the Study:

  • Investigate the solid-solid phase transition in iron nanowires under axial strain.
  • Determine the influence of temperature and strain rate on this transition.
  • Analyze the elastic behavior of different crystal phases in nanowires.

Main Methods:

  • Classical molecular-dynamics simulations were employed.
  • An interatomic potential validated for iron phase transitions was used.
  • Stress-strain curves were analyzed at various temperatures and strain rates.

Main Results:

  • A body-centered cubic (bcc) to close-packed crystal structure transition was induced by axial strain in iron nanowires.
  • This solid-solid phase transition occurred at temperatures below the bulk transition temperature.
  • The bcc phase exhibited softening, while the close-packed phase showed stiffening with increasing temperature.
  • The reversibility of the transformation and the effect of strain rate were also examined.

Conclusions:

  • Axial strain can induce reversible solid-solid phase transitions in iron nanowires within specific temperature ranges.
  • The elastic properties of the bcc and close-packed phases are temperature-dependent.
  • Strain rate plays a role in the critical strain required for phase transformation.