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Related Concept Videos

Strain Energy01:13

Strain Energy

Strain energy is a fundamental concept in the field of materials science and structural engineering, describing the energy absorbed by a material or structure when it is deformed under load.
Consider a rod that is fixed at one end and subjected to an axial force at the free end. This axial force induces stress within the rod, leading to its elongation. As the axial force increases, so does the elongation of the rod, illustrating a direct relationship between the force applied and the resulting...
Strain-Energy Density01:20

Strain-Energy Density

Understanding the strain energy density in materials under axial load is crucial for evaluating their mechanical behavior and durability. When a rod is subjected to such a load, it elongates and stores energy, known as strain energy, as potential energy within the material. This energy is measured in terms of energy per unit volume.
In the elastic region of a material, the relationship between the stress and the strain is linear and follows Hooke's Law. The strain energy density in this region...
Fatigue01:21

Fatigue

Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
Impact Loading01:19

Impact Loading

Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
Elastic Strain Energy for Normal Stresses01:22

Elastic Strain Energy for Normal Stresses

Strain energy quantifies the energy stored within a material due to deformation under loading conditions, a fundamental concept in materials science and engineering. The strain energy can be modeled when a material is subjected to axial loading with uniformly distributed stress. In this scenario, the stress experienced by the material is the internal force divided by the cross-sectional area, and the strain induced is directly proportional to this stress through the modulus of elasticity.
If...

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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
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Published on: November 22, 2021

Stacking Fault Energy Engineering as the Pathway to Materials With Exceptional Performance.

Jiacheng Yu1, Ran Ding1, Yongchang Liu1

  • 1State Key Laboratory of High Performance Roll Materials and Composite Forming, Tianjin University, Tianjin, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|May 22, 2026
PubMed
Summary
This summary is machine-generated.

Stacking fault energy (SFE) is crucial for advanced materials, but predicting it accurately is challenging. This review compares strategies for engineering SFE in metals and ceramics to improve material properties.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Solid State Physics

Background:

  • Stacking fault energy (SFE) is a key thermodynamic parameter controlling defect evolution in materials.
  • A significant discrepancy exists between theoretically predicted intrinsic SFE (γisf) and experimentally measured apparent SFE (γapp), which is influenced by microstructure and chemistry.
  • Tailoring SFE strategies vary significantly between metallic and non-metallic material systems.

Purpose of the Study:

  • To review fundamental physical frameworks of SFE engineering.
  • To compare SFE tailoring strategies and their mechanical impacts in metallic and non-metallic systems.
  • To guide the design of next-generation structural materials by understanding SFE manipulation.

Main Methods:

  • Review of first-principles calculations and experimental measurements of SFE.
  • Analysis of SFE engineering approaches in metallic alloys (high and medium entropy alloys) focusing on alloying and chemical ordering.
  • Examination of SFE manipulation in non-metallic materials (oxides, ceramics) via defect chemistry, interfacial templating, and non-equilibrium processing.

Main Results:

  • First-principles calculations of intrinsic SFE often differ from experimentally observed apparent SFE due to microstructural and chemical factors.
  • SFE engineering in metallic alloys primarily involves macroscopic alloying and altering the generalized stacking fault energy (GSFE) landscape.
  • In non-metallic materials, SFE is engineered by manipulating defect chemistry and utilizing interfacial templating and non-equilibrium processing to overcome brittleness.

Conclusions:

  • Effective SFE engineering requires distinct approaches for metallic and non-metallic materials.
  • Understanding the interplay between SFE, microstructure, and processing is vital for designing materials with improved strength and ductility.
  • This review provides a comparative analysis to inform future material design strategies.