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相关概念视频

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

141
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...
141
Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

643
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...
643
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

252
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.
252
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

158
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
158
Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

446
Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
446
Residual Stresses01:26

Residual Stresses

207
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...
207

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An Available Technique for Preparation of New Cast MnCuNiFeZnAl Alloy with Superior Damping Capacity and High Service Temperature
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合金对铜变形诱导微观结构演变的影响

Reeju Pokharel1, Tongjun Niu2, Sara Ricci2,3

  • 1Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM, 87544, USA. reeju@lanl.gov.

Scientific reports
|October 13, 2024
PubMed
概括

将添加到铜 (Cu) 中会增加脱位密度,并影响塑性变形,特别是在粒边界附近. 这项研究揭示了合金元素如何在多个尺度上影响材料特性.

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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.
  • 固体力学 固体力学是什么

背景情况:

  • 多晶铜 (Cu) 和其合金是关键的结构材料.
  • 了解 (Pb) 等合金元素对Cu的机械性能的影响至关重要.
  • 不混合合金在微观结构进化和变形行为方面存在独特的挑战.

研究的目的:

  • 研究 (Pb) 作为合金元素对铜 (Cu) 的塑性变形和微观结构演变的影响.
  • 分析Cu-1重量%Pb (Cu-1Pb) 与纯Cu.相比的多尺度变形行为.
  • 阐明在粒边界的沉对合金机械反应的作用.

主要方法:

  • 多模特特征:中子衍射,电子反散衍射 (EBSD),传输电子显微镜 (TEM).
  • 有限元模拟以建模变形行为.
  • 脱位线形状分析以量化脱位密度.
  • 机械测试 (压缩) 以评估宏观和局部塑性变形.

主要成果:

  • 和Cu-1Pb都显示出类似的宏观反应和变形纹理.
  • 与纯相比,变形的Cu-1Pb表现出更高的脱位密度.
  • 颗粒边界的沉影响了局部塑性变形,而这种效应在更高的压力下降.
  • 微观结构分析显示,由于合金而导致的脱位积累存在显著差异.

结论:

  • 合金元素,如铜中的,显著影响塑料变形和微观结构演变.
  • 不能混合的沉物的存在改变了局部变形机制.
  • 多尺度分析对于理解合金的行为至关重要.
  • 研究结果为设计具有定制性质的先进结构材料提供了基本的见解.