相关实验视频
Updated: Jul 15, 2025
05:04
Determining the Mechanical Strength of Ultra-Fine-Grained Metals
Published on: November 22, 2021
2.3K
关于基超合金在拉伸变形过程中的脱位-沉相互作用的分子动力学研究
Chang-Feng Wan1, Li-Gang Sun1, Hai-Long Qin2
1School of Science, Harbin Institute of Technology, Shenzhen 518055, China.
Materials (Basel, Switzerland)
|September 28, 2023
概括
分子动力学模拟揭示了位如何与Inconel 718超级合金中的沉物相互作用. 较大的沉物减少了流应力,而脱位行为取决于沉物相互作用点和加载方向.
科学领域:
- 材料科学 材料科学 材料科学
- 金工业是金工业的一个方面.
- 计算材料科学科学 计算材料科学
背景情况:
- 718是一种以为基础的超合金,用于苛刻的应用.
- 了解沉物-脱位相互作用是优化超级合金性能的关键.
- 纳米沉物显著影响超级合金的机械性能.
研究的目的:
- 在原子层面上研究Inconel 718的脱位-沉相互作用.
- 为了阐明Ni3Nb沉增强矩阵复合材料中的塑性变形机制.
- 量化沉物大小和加载方向对机械行为的影响.
主要方法:
- 使用分子动力学模拟的原子模型.
- 用圆形Ni3Nb沉物构建一个复合Ni3Nb@Ni系统.
- 模拟沿着各种负载方向进行拉伸试验,以分析脱位行为.
主要成果:
- 在塑性变形过程中同时观察到脱位剪切和绕过机制.
- 脱位透深度受到沉积物表面的接触位置的影响.
- 确定了大约20nm的最大障碍尺寸用于脱位剪切.
- 在加载沿着沉物主要轴时,无otropic塑料变形显示出更强的剪切应变局部化.
- 较大的沉导致流量应力的弹性极限较低.
- 分析了沉物中的脱位积累,量化了脱位密度.
结论:
- 这项研究提供了对基于的超级合金与纳米沉物的机械行为的原子洞察.
- 脱位-沉相互作用是复杂的,涉及同时切割和绕过.
- 沉物大小和加载方向是影响异型机械反应的关键因素.
相关概念视频
01:24Stress-Strain Diagram - Ductile Materials
813
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...
813
01:12Temperature Dependent Deformation
161
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...
161
01:03Precipitation Gravimetry
6.6K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
6.6K
01:21Plastic Behavior
218
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
218