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Measurement of dislocation velocities and mobile dislocation densities as a function of strain and strain rate in cadmium single crystals.

机译：镉单晶中位错速度和移动位错密度的测量与应变和应变率的关系。

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Instantaneous dislocation velocities and associated dislocation densities were measured in situ while cadmium single crystals were being plastically deformed. These measurements exploited the interactions between electrons and dislocations, brought about by the application of a magnetic field. During the deformation of the cadmium crystal at 4.2 K, a magnetic field was rotated through the active slip plane of the crystal, resulting in a change (maximum) in the deformation stress. These maxima were observed only when the crystal is deforming plastically, only when the magnetic field passes through the slip plane and only when the electrons are the dominant drag force on the dislocations, occurring only at low temperatures. Measurements of these maxima as a function of plastic strain show that they consist of two types of peaks. Single sharp peaks were observed predominantly at lower values of strain and two broad peaks, symmetrically arranged about the angle corresponding to the measured angle that the slip plane makes with the tensile axis, were observed predominantly at higher strain. These results were compared with treatments of electron-dislocation interactions and were consistent with the viscous drag process controlling the dislocation motion.

机译：镉单晶塑性变形时，瞬时位错速度和相关的位错密度通过原位测量。这些测量利用了电子和位错之间的相互作用，这是由磁场的施加引起的。在镉晶体在4.2 K变形的过程中，磁场旋转通过晶体的有效滑动面，导致变形应力发生变化（最大）。仅当晶体发生塑性变形，仅当磁场通过滑移面且仅当电子是位错的主要拉力（仅在低温下发生）时，才观察到这些最大值。这些最大值作为塑性应变的函数的测量结果表明，它们由两种类型的峰组成。主要在较低的应变值下观察到一个尖峰，而在相对较高的应变下则观察到两个宽峰，两个峰围绕与滑移面与拉伸轴形成的测量角度相对应的角度对称排列。将这些结果与电子-位错相互作用的处理进行了比较，并且与控制位错运动的粘性拖曳过程相一致。

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作者
Robson, Mark Todhunter.;
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作者单位

The University of Connecticut.;

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授予单位 The University of Connecticut.;
学科 Engineering Metallurgy.; Engineering Materials Science.
学位 Ph.D.
年度 2003
页码 73 p.
总页数 73
原文格式 PDF
正文语种 eng
中图分类冶金工业;工程材料学;
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3. The Contribution of Dislocation Density and Velocity to the Strain Rate and Size Effect Using Transient Indentation Methods and Activation Volume Analysis [J] . Stegall D. E., Elmustafa A. A. Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science . 2018,第10期

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Measurement of dislocation velocities and mobile dislocation densities as a function of strain and strain rate in cadmium single crystals.

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