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相关概念视频

Mechanical Characteristics of Steel01:18

Mechanical Characteristics of Steel

769
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...
769
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

18.9K
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....
18.9K

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相关实验视频

Updated: Sep 18, 2025

Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory
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在异步滚动下纯铜的微观结构和性能演变.

Shan Jiang1,2, Long Bai1,2, Pin Zhang1,2

  • 1Aviation Key Lab of Science and Technology on High Performance Electromagnetic Windows, AVIC Research Institute for Special Structures of Aeronautical Composite, Ji'nan 250023, China.

Materials (Basel, Switzerland)
|June 27, 2025
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概括

异步造提高了纯铜的强度,但降低了柔性和导电性. 较高的异步比增加了强度,但也增加了缺陷,影响了电气性能.

关键词:
不同步滚动的滚动.电导率是指电导的电导率.微观结构的演变.菌株分布 菌株分布 菌株分布具有拉伸性质的特性.

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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.
  • 机械工程 机械工程

背景情况:

  • 纯铜对于电气应用至关重要.
  • 优化其机械和电气性能至关重要.
  • 异步是一种新的加工技术.

研究的目的:

  • 为了研究异步滚动对纯铜的作用.
  • 分析微观结构的变化,拉伸性质和电导率.
  • 为了确定不同异步比率的影响.

主要方法:

  • 纯铜板采用异步制 (比例为1.0和1.2) 进行加工.
  • 微结构分析通过电子反射散射衍射.
  • 拉力测试和电阻测量.

主要成果:

  • 增加了最终抗拉强度 (25.8%) 和收强度 (3.42%) 在1.2的比率.
  • 观察到的权衡:增强的强度与降低的柔性 (延长) 相关联.
  • 更高的异步比率导致缺陷密度增加,导电率降低了19.96%.

结论:

  • 异步造显著改变纯铜的性能.
  • 参数优化是平衡强度,可塑性和导电性的关键.
  • 结果为工业应用量身定制的材料设计提供了指导.