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Related Concept Videos

Structures of Solids02:22

Structures of Solids

13.8K
Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
13.8K
Metallic Solids02:37

Metallic Solids

18.2K
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....
18.2K
Plasticity00:58

Plasticity

2.1K
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...
2.1K
Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

597
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...
597
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

138
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...
138
Segregation in Fresh Concrete01:16

Segregation in Fresh Concrete

90
Segregation in fresh concrete is a phenomenon where the components of the concrete mix separate, leading to uneven distribution and compromised structural integrity. This separation typically occurs when concrete is subjected to excessive horizontal movement within forms, or when it is dropped from considerable heights or forced through narrow, winding paths. As a result, heavier coarse aggregate particles settle at the bottom, while lighter, finer materials such as cement and water rise to the...
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Related Experiment Video

Updated: Jun 12, 2026

An Available Technique for Preparation of New Cast MnCuNiFeZnAl Alloy with Superior Damping Capacity and High Service Temperature
14:51

An Available Technique for Preparation of New Cast MnCuNiFeZnAl Alloy with Superior Damping Capacity and High Service Temperature

Published on: September 23, 2018

Segregation-dislocation self-organized structures ductilize a work-hardened medium entropy alloy.

Bojing Guo1, Dingcong Cui1, Qingfeng Wu1

  • 1State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, China.

Nature Communications
|February 8, 2025
PubMed
Summary
This summary is machine-generated.

High-density dislocations in work-hardened alloys can enhance ductility when organized into self-organized structures. This novel approach overturns traditional theories by enabling effective dislocation storage and multiplication, leading to improved material properties.

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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
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Determining the Mechanical Strength of Ultra-Fine-Grained Metals

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Related Experiment Videos

Last Updated: Jun 12, 2026

An Available Technique for Preparation of New Cast MnCuNiFeZnAl Alloy with Superior Damping Capacity and High Service Temperature
14:51

An Available Technique for Preparation of New Cast MnCuNiFeZnAl Alloy with Superior Damping Capacity and High Service Temperature

Published on: September 23, 2018

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
09:41

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
05:04

Determining the Mechanical Strength of Ultra-Fine-Grained Metals

Published on: November 22, 2021

Area of Science:

  • Materials Science
  • Metallurgy
  • Solid Mechanics

Background:

  • Dislocations are fundamental to crystal plasticity and strengthening.
  • Traditional theories suggest high dislocation density in work-hardened materials reduces ductility.
  • Self-organized critical states in complex systems offer inspiration for material design.

Purpose of the Study:

  • To investigate the mechanical response of additively manufactured alloys with segregation-dislocation self-organized structures (SD-SOS).
  • To challenge the conventional understanding of dislocation hardening's impact on ductility.
  • To explore novel strategies for optimizing alloy mechanical behavior.

Main Methods:

  • Additive manufacturing of a medium entropy alloy.
  • Characterization of segregation-dislocation self-organized structures (SD-SOS).
  • Mechanical testing to evaluate plasticity and ductility.

Main Results:

  • SD-SOS configurations enable dislocation emission and stacking fault generation.
  • Dynamic interaction of SD-SOS with gliding dislocations leads to dislocation storage via Lomer-Cottrell locks and jogs.
  • Effective dislocation multiplication and storage result in refined slip bands and high ductility.

Conclusions:

  • The study overturns the textbook theory that dislocation hardening sacrifices ductility.
  • SD-SOS provides a mechanism for achieving high ductility in work-hardened alloys.
  • Tuning dislocation configurations offers a new pathway for optimizing alloy mechanical properties.