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関連する概念動画

Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

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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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Metallic Solids02:37

Metallic Solids

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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....
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Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

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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...
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Mechanical Characteristics of Steel01:18

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The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
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Strain-Energy Density01:20

Strain-Energy Density

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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...
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Hooke's Law01:26

Hooke's Law

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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.
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グラデント細胞構造の高エントロピー合金で,特殊な強さと柔らかさを持っています.

Qingsong Pan1, Liangxue Zhang1,2, Rui Feng3

  • 1Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, P.R. China.

Science (New York, N.Y.)
|September 23, 2021
PubMed
まとめ

研究者らは,高エントロピー合金 (HEA) の強さと柔らかさを,グラデントナノスケールの変位細胞を導入することによって強化した. この制御された構造は,故障と双子形成を促進し,材料の特性と作業硬化を改善します.

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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
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Determining the Mechanical Strength of Ultra-Fine-Grained Metals

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関連する実験動画

Last Updated: Oct 19, 2025

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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
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科学分野:

  • 材料科学
  • 金属工学
  • ナノテクノロジー

背景:

  • 高エントロピー合金 (HEAs) は,強度と柔らかさの間のトレードオフを示し,その用途を制限します.
  • 従来の材料は通常,強度が増えるにつれて柔らかさを失います.
  • HEAの変形メカニズムを理解することは,プロパティの最適化に不可欠です.

研究 の 目的:

  • 面を中心とした立方体HEAで制御的に導入されたグラデントナノスケールの変位細胞構造の効果を調査する.
  • HEAで同時に強度と柔らかさを高めるために.
  • 機械的性質の改善に起因する根本的な変形メカニズムを解明する.

主な方法:

  • 安定した単相面中心立方高エントロピー合金.
  • ナノスケールの変位細胞構造の制御された導入
  • 微細構造分析と施したストレスの下での機械的試験.

主要な成果:

  • 柔らかさを大幅に失わずに強度が向上した.
  • 脱位細胞から核を分泌し,圧迫した際の漸進的な堆積欠陥 (SFs) と双子の形成を観察した.
  • SFによる可塑性および蓄積された変位は,作業の硬化と機械的性能の改善に寄与することを実証した.

結論:

  • グラデント変位細胞構造は,HEAの特性を調整するための新しいアプローチを提供します.
  • 発見は,ナノスケールでのHEAsの変形行動に関する基本的な洞察を提供します.
  • この戦略は,高度な高性能合金設計のための有望なパラダイムを示しています.