メタステーブルな高エントロピー二相合金は,強度-柔性トレードオフを克服する
Zhiming Li1, Konda Gokuldoss Pradeep1, Yun Deng1
1Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf, Germany.
Nature
|June 10, 2016
まとめ
この研究は,高エントロピーの合金のためのメタスタビリティエンジニアリングを導入し,インターフェースと変換硬化のための減少した相安定性を活用することによって,強さと柔らかさを両方強化する二相合金を作成します.
科学分野:
- 材料科学
- 金属工学
- ナノテクノロジー
背景:
- 金属は不可欠ですが 環境や経済的な課題に直面しています
- 合金強度が増加すると,しばしば柔性 (強度-柔性トレードオフ) が損なわれます.
- 高エントロピー合金 (HEA) は,伝統的に相安定化のためにエントロピーの最大化に依存しています.
研究 の 目的:
- 先進的な合金設計のための新しいメタスタビリティエンジニアリング戦略を開発する.
- 高エントロピー合金における強度-柔らかさのトレードオフを克服するために.
- 高エントロピーの二相合金を作り 機械性能を向上させる
主な方法:
- ナノ構造で設計された高エントロピー合金で,複数の組成が同等である.
- インターフェース硬化および変換誘発硬化を引き起こすための相安定性の低下.
- トランスフォーメーション誘発型可塑性補助型二相高エントロピー合金 (TRIP-DP-HEA) を開発した.
主要な成果:
- デュアルフェーズマイクロ構造によってインターフェースの硬化が達成された.
- 段階的機械的安定性を低下させることで変換誘発硬化が可能である.
- TRIP-DP-HEAは,他の構造材料よりも性能が優れていることが実証されています.
結論:
- メタスタビリティエンジニアリングは,HEA設計に新しいアプローチを提供します.
- 段階安定性の低下は,有益な硬化メカニズムのために利用できます.
- TRIP-DP-HEA戦略は,優れた強度-柔らかさの組み合わせへの道を提供します.
関連する概念動画
Stress-Strain Diagram - Ductile Materials
2.4K
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...
2.4K
Yield Criteria for Ductile Materials under Plane Stress
664
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...
664
Metallic Solids
21.3K
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....
21.3K
Bonding in Metals
55.6K
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”.
55.6K
Residual Stresses
777
Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
777
Hooke's Law
1.8K
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.
1.8K


