Related Experiment Video
Updated: Aug 26, 2025
09:51
Atom Probe Tomography Studies on the CuIn,GaSe2 Grain Boundaries
Published on: April 22, 2013
12.9K
Migration of solidification grain boundaries and prediction
Hongmei Liu1,2,3, Shenglu Lu4, Yingbo Zhang5
1School of Materials Science and Engineering, Southwest Jiaotong University, 610031, Chengdu, China. lhm@home.swjtu.edu.cn.
Nature Communications
|October 7, 2022
Summary
Solidification grain boundary migration (SGBM) decouples boundaries from microsegregation in magnesium-tin alloys. SGBM is independent of cooling rate, depending instead on grain size, offering new control over material properties.
Area of Science:
- Materials Science
- Metallurgy
- Solidification Science
Background:
- Solidification processing is crucial for metal manufacturing, including additive manufacturing.
- Solidification grain boundaries (SGBs) form from the last liquid film between adjacent grains.
- SGB migration (SGBM) decouples SGBs from microsegregation, impacting material properties.
Purpose of the Study:
- To investigate the features of SGBM in magnesium-tin alloys.
- To develop a theoretical model for SGBM in dilute binary alloys.
- To understand the influence of solute type and content on SGBM.
Main Methods:
- Experimental observation of SGBM in magnesium-tin alloys under varying cooling rates (8-1690 °C/s).
- Development of a theoretical model for SGBM in binary alloys.
- Application and validation of the model across 10 alloy systems.
Main Results:
- SGBM was observed and characterized in magnesium-tin alloys.
- The theoretical model accurately predicted SGBM behavior in various alloys.
- SGBM was found to be independent of cooling rate and time, correlating with grain size.
- SGBM exhibits a tendency for athermal occurrence.
Conclusions:
- SGBM is a significant phenomenon in solidification processing, independent of cooling rate.
- Grain size is a key factor controlling SGBM.
- The developed model provides a framework for predicting and controlling SGBM.
- Findings offer new strategies for optimizing solidification grain structure and material performance, mitigating issues like cracking and corrosion.
Related Concept Videos
01:28Magnetostatic Boundary Conditions
1.1K
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
1.1K
02:54Molecular and Ionic Solids
17.4K
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...
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...
17.4K
02:37Metallic Solids
18.6K
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....
18.6K
01:25Yield Criteria for Ductile Materials under Plane Stress
211
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...
The Maximum Shearing Stress Criterion, also known as...
211
01:12Temperature Dependent Deformation
183
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...
183
01:10Recrystallization: Solid–Solution Equilibria
1.2K
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...
1.2K