Related Experiment Video
Updated: Apr 3, 2026
08:55
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
9.0K
Disclination mediated dynamic recrystallization in metals at low temperature
Mohammad Aramfard1, Chuang Deng1
1Department of Mechanical Engineering, University of Manitoba, 15 Gillson Street, Winnipeg, MB, R3T 5V6, Canada.
Scientific Reports
|September 17, 2015
Summary
A new dynamic recrystallization mechanism operates at 10 K, driven by disclination quadrupoles, not just heat. This finding challenges traditional views and offers new ways to refine metal microstructures during cryogenic deformation.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Crystallography
Background:
- Recrystallization is a crucial materials processing phenomenon, historically considered thermally activated.
- Conventional understanding requires a minimum temperature for atomic mechanisms driving recrystallization.
- Existing models for recrystallization during deformation primarily focus on dislocation-based mechanisms.
Purpose of the Study:
- To investigate a novel mechanism for dynamic recrystallization.
- To explore recrystallization phenomena at cryogenic temperatures (as low as 10 K).
- To challenge the established thermal activation requirement for recrystallization.
Main Methods:
- Utilized atomistic simulations to model materials behavior.
- Focused on dynamic recrystallization processes during deformation.
- Investigated the role of specific crystallographic defects.
Main Results:
- Discovered a new dynamic recrystallization mechanism effective at 10 K.
- This mechanism relies on the generation of disclination quadrupoles.
- Observed that grain boundary migration restriction by defects like triple junctions facilitates this mechanism.
Conclusions:
- Dynamic recrystallization can occur at very low temperatures (10 K) via a disclination quadrupole mechanism.
- This provides an alternative explanation for grain refinement during severe plastic deformation at cryogenic temperatures.
- Suggests new strategies for tailoring microstructures in crystalline materials.
More Related Videos
Related Concept Videos
01:10Recrystallization: Solid–Solution Equilibria
4.7K
Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
4.7K
01:25Crystal Growth: Principles of Crystallization
6.0K
Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
6.0K
02:32Bonding in Metals
56.1K
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”.
56.1K
02:39Phase Transitions: Melting and Freezing
15.7K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
15.7K
02:37Metallic Solids
21.4K
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....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
21.4K
01:25Imperfections in Crystal Structure: Point, Line and Plane Defects
96
A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
96