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Related Concept Videos

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
Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

605
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...
605
Bonding in Metals02:32

Bonding in Metals

46.8K
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”. 
46.8K
Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

140
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
140
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

16.8K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
16.8K
Hooke's Law01:26

Hooke's Law

342
Hooke's law, a pivotal principle in material science, establishes that the strain a material undergoes is directly proportional to the applied stress, defined by a factor called the modulus of elasticity or Young's modulus.
342

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Related Experiment Videos

Highly printable, strong, and ductile ordered intermetallic alloy.

Yinghao Zhou1,2, Weicheng Xiao1, Dawei Wang3

  • 1Department of Materials Science and Engineering, College of Engineering, City University of Hong Kong, Hong Kong, China.

Nature Communications
|January 25, 2025
PubMed
Summary

Additive manufacturing of chemically complex intermetallic alloys (CCIMA) overcomes brittleness issues. This laser powder bed fusion process yields crack-free alloys with exceptional strength and ductility, paving the way for advanced material applications.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Additive Manufacturing

Background:

  • Ordered intermetallic alloys offer desirable properties but suffer from brittleness and poor fabricability, limiting their practical use.
  • Traditional manufacturing methods struggle to create complex geometries from these brittle materials.

Purpose of the Study:

  • To develop a strategy for overcoming the brittleness and fabricability challenges of ordered intermetallic alloys.
  • To enable the additive manufacturing of chemically complex intermetallic alloys (CCIMA) with improved properties.

Main Methods:

  • Utilized laser powder bed fusion (LPBF) for additive manufacturing of CCIMA.
  • Characterized the microstructure, porosity, tensile strength, and elongation of the manufactured alloys.

Main Results:

  • Achieved good printability with a crack-free microstructure and extremely low porosity (0.005%).
  • Obtained a unique combination of high tensile strength (~1.6 GPa) and large uniform elongation (~35%).
  • Attributed the enhanced properties to a microstructure featuring ordered superlattice grains and disordered interfacial nanolayers.

Conclusions:

  • Additive manufacturing via LPBF offers a viable route to produce high-performance CCIMA.
  • The developed CCIMA exhibits superior mechanical properties compared to existing additive-manufactured alloys.
  • Findings provide a foundation for developing advanced intermetallic alloys and accelerating their industrial adoption.