轻质高合金的基于第一原则的设计
Viacheslav Sorkin1, Zhi Gen Yu2, Shuai Chen2,3
1Institute of High Performance Computing (IHPC), Agency for Science, Technology and Research (A*STAR), 1 Fusionopolis Way, #16-16 Connexis, Singapore, 138632, Republic of Singapore. sorkinv@ihpc.a-star.edu.sg.
Scientific reports
|December 18, 2023
概括
研究人员使用计算方法设计了新的轻质高合金 (HEAs). 与传统合金相比,这些新的HEAs显示出更好的稳定性和刚性.
科学领域:
- 材料科学 材料科学 材料科学
- 计算材料设计设计 计算材料设计
- 合金开发 合金开发
背景情况:
- 轻质高合金 (HEAs) 在结构应用中越来越重要.
- 现有的轻质合金通常在性能或稳定性方面存在局限性.
- 需要具有优越性质的先进材料.
研究的目的:
- 设计具有单个固体溶液阶段的新型轻质HEAs.
- 识别具有低密度,高稳定性和优良机械性能的最佳组合的HEA组合物.
- 为新型轻型高压电机的实验合成提供指导.
主要方法:
- 利用基于第一原则的高通量计算方法.
- 系统地探索了三种五分级HEA家族 (AlBeMgTiLi,AlBeMgTiSi,AlBeMgTiCu) 的组成空间.
- 应用了设计标准,包括稳定性,质量密度,弹性模量,特定刚度和Pugh的比率.
主要成果:
- 确定了具有负形成能量,低密度和高特异性Young模量的有前途的HEA化合物.
- 最稳定的组成,Al0.31Be0.15Mg0.14Ti0.05Si0.35,表现出优越的能量稳定性,性能优于7075Al合金.
- 与当前的合金相比,设计的HEAs具有更高的稳定性,更低的密度和更高的刚性,尽管柔性略有降低.
结论:
- 开发的计算方法有效指导轻质HEAs的设计.
- 已确定的HEA组合物代表了下一代轻质结构材料的有希望的候选者.
- 这些发现促进了先进,高性能轻质合金的实验实现.
相关概念视频
Mechanical Characteristics of Steel
578
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...
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...
578
Design of Prismatic Beams for Bending
239
The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
239
Design Consideration
188
Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key...
The factor of safety is another key...
188
Metallic Solids
18.4K
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....
18.4K
Yield Criteria for Ductile Materials under Plane Stress
164
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...
164
Unsymmetric Loading of Thin-Walled Members: Problem Solving
108
The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
To compute the shear forces, find the shear flow at a specific distance from the endpoint using the vertical shear and the moment of inertia values. The total shear force on the flange is calculated by integrating the shear flow from one end of the flange to the other.
Next, calculate the moments of...
To compute the shear forces, find the shear flow at a specific distance from the endpoint using the vertical shear and the moment of inertia values. The total shear force on the flange is calculated by integrating the shear flow from one end of the flange to the other.
Next, calculate the moments of...
108


