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Stress-Strain Diagram - Ductile Materials01:24

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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...
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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Atomic mobility and strain localization in amorphous metals.

Francesco Delogu1

  • 1Dipartimento di Ingegneria Chimica e Materiali, Università di Cagliari, piazza d'Armi, I-09123 Cagliari, Italy. delogu@dicm.unica.it

Physical Review Letters
|March 21, 2008
PubMed
Summary
This summary is machine-generated.

Molecular dynamics simulations reveal distinct atomic mobility mechanisms in Ni(50)Zr(50) amorphous alloys. Under static conditions, diffusion involves cooperative stringlike motion, while shearing induces localized rearrangements in shear transformation zones (STZs).

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Amorphous alloys, such as Ni(50)Zr(50), exhibit unique mechanical properties.
  • Understanding atomic mobility is crucial for predicting alloy behavior under stress.

Purpose of the Study:

  • To investigate atomic mobility in Ni(50)Zr(50) amorphous alloys.
  • To differentiate atomic movement under static versus shearing conditions.

Main Methods:

  • Utilizing molecular dynamics simulations.
  • Analyzing atomic trajectories and local atomic volumes.

Main Results:

  • Under static conditions, diffusion is characterized by cooperative, stringlike atomic motion.
  • Under shearing, atomic mobility is governed by localized rearrangements within shear transformation zones (STZs).
  • Local atomic volume is a critical factor, correlating strongly with diffusion and STZ activity.

Conclusions:

  • Distinct mechanisms govern atomic mobility in Ni(50)Zr(50) amorphous alloys depending on applied conditions.
  • The size of atomic ensembles, particularly local atomic volume, is a key determinant of atomic mobility.