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Related Concept Videos

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

141
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...
141
Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

643
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...
643
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

252
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.
252
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

158
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...
158
Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

446
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...
446
Residual Stresses01:26

Residual Stresses

207
Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
207

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Alloying effects on deformation induced microstructure evolution in copper.

Reeju Pokharel1, Tongjun Niu2, Sara Ricci2,3

  • 1Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM, 87544, USA. reeju@lanl.gov.

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Summary
This summary is machine-generated.

Adding lead to copper (Cu) increases dislocation density and affects plastic deformation, especially near grain boundaries. This study reveals how alloying elements influence material properties at multiple scales.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Solid Mechanics

Background:

  • Polycrystalline copper (Cu) and its alloys are crucial structural materials.
  • Understanding the impact of alloying elements like lead (Pb) on Cu's mechanical properties is vital.
  • Immiscible alloys present unique challenges in microstructure evolution and deformation behavior.

Purpose of the Study:

  • To investigate the effects of lead (Pb) as an alloying element on the plastic deformation and microstructure evolution of copper (Cu).
  • To analyze the multi-scale deformation behavior of Cu-1 wt.% Pb (Cu-1Pb) compared to pure Cu.
  • To elucidate the role of lead precipitates at grain boundaries on the mechanical response of the alloy.

Main Methods:

  • Multi-modal characterization: neutron diffraction, electron backscatter diffraction (EBSD), transmission electron microscopy (TEM).
  • Finite element simulations to model deformation behavior.
  • Dislocation line profile analysis to quantify dislocation density.
  • Mechanical testing (compression) to assess macroscopic and local plastic deformation.

Main Results:

  • Both Cu and Cu-1Pb showed similar macroscale responses and deformation textures.
  • Deformed Cu-1Pb exhibited higher dislocation density compared to pure Cu.
  • Lead precipitates at grain boundaries influenced local plastic deformation, with this effect decreasing at higher strains.
  • Microstructure analysis revealed significant differences in dislocation accumulation due to alloying.

Conclusions:

  • Alloying elements, like lead in copper, significantly influence plastic deformation and microstructure evolution.
  • The presence of immiscible precipitates alters local deformation mechanisms.
  • Multi-scale analysis is essential for understanding the behavior of alloys.
  • Findings provide fundamental insights for designing advanced structural materials with tailored properties.