应变硬化中的内在拉伸柔性多重元素金属玻璃
Zhibo Zhang1, Shan Zhang1,2, Qing Wang3
1Department of Mechanical Engineering, College of Engineering, City University of Hong Kong, Kowloon Tong, Kowloon, Hong Kong 999077, People's Republic of China.
概括
研究人员开发了一种具有高强度和柔性的新型多元元素金属玻璃 (MPEMG). 这种新型材料克服了传统金属玻璃的局限性,为先进的应用铺平了道路.
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.
- 固态物理 固态物理
背景情况:
- 传统的金属玻璃 (MGs) 在室温下往往缺乏拉伸柔性.
- 这种限制限制了它们广泛的技术应用.
- 开发柔性MG是材料科学中的一个重大挑战.
研究的目的:
- 设计一种具有增强机械性能的多元元素金属玻璃 (MPEMG).
- 为了研究结构-属性关系,规范MGs的可塑性.
- 探索设计先进金属玻璃材料的新途径.
主要方法:
- 合成一个多元元素金属玻璃 (MPEMG).
- 描述其无形结构,重点是原子尺寸不匹配和分数.
- 在室温下进行拉伸测试,以评估屈服强度,应变硬化和柔性.
- 剪切带行为分析,包括元素分离和排序.
主要成果:
- 开发的MPEMG显示了千兆帕斯卡的收益率强度.
- 观察到显著的应变硬化,几乎使得产量强度翻了一番.
- 在室温下达到2%的均拉伸柔性,与传统的MGs相比显著改善.
- 具有大小不匹配的原子和相似的分数的异质无形结构是关键.
- 剪切带带诱导局部元素分离和排序,导致硬化和自我停止.
结论:
- 具有异质结构的MPEMG提供了一种途径,可以同时实现高强度和柔性.
- 通过元素分离观察到的剪带自我停止的机制对于塑料流动至关重要.
- 这项研究提供了一个有前途的策略,用于为各种技术领域设计更强,更柔性玻璃.
相关概念视频
01:24Stress-Strain Diagram - Ductile Materials
708
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...
708
01:24Stress-Strain Diagram - Brittle Materials
2.3K
Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
2.3K
01:25Yield Criteria for Ductile Materials under Plane Stress
160
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...
160
01:26Hooke's Law
381
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.
381
01:21Plastic Behavior
196
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...
196
01:15Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
264
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
264