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Related Concept Videos

Plastic Deformations01:19

Plastic Deformations

276
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...
276
Plastic Deformations01:14

Plastic Deformations

263
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...
263
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

313
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
313
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

270
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
270
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

402
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.
402
Deformations in a Transverse Cross Section01:21

Deformations in a Transverse Cross Section

435
When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
435

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Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
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Interactions between Dislocations and Boundaries during Deformation.

Hongjiang Pan1,2, Yue He3, Xiaodan Zhang2

  • 1Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China.

Materials (Basel, Switzerland)
|March 6, 2021
PubMed
Summary
This summary is machine-generated.

This review details how dislocations interact with boundaries in metals at ambient temperatures. Understanding these interactions is key to controlling material properties and developing advanced metal alloys.

Keywords:
boundary strengtheningboundary structurecharacterization techniquesdeformation twin-boundary interactiondislocation–boundary interactiondislocation–interface interactionsize effect

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Solid Mechanics

Background:

  • Dislocations and deformation twins are fundamental to plastic deformation in metals.
  • Interactions between these defects and various boundaries (grain, twin, phase) significantly influence material behavior.
  • Controlling these interactions is crucial for tailoring mechanical properties.

Purpose of the Study:

  • To comprehensively review the interactions between dislocations and boundaries during deformation at ambient temperatures.
  • To elucidate the mechanisms, influencing factors, and consequences of these interactions.
  • To serve as a reference for researchers studying dislocation-boundary interactions.

Main Methods:

  • Literature review of experimental and simulation results.
  • Analysis of in-situ techniques for observing these interactions.
  • Synthesis of fundamental concepts and latest research findings.

Main Results:

  • Detailed examination of interaction behaviors, boundary resistances, and energies.
  • Summary of dislocation transmission mechanisms across boundaries.
  • Discussion of grain size effects (coarse-grained, ultrafine-grained, nano-grained) on interactions.
  • Evaluation of the advantages and drawbacks of various in-situ techniques.

Conclusions:

  • Dislocation-boundary interactions are complex and highly dependent on boundary structure and material microstructure.
  • Understanding these interactions is vital for designing metals with desired mechanical properties.
  • This review consolidates current knowledge and highlights areas for future research.