Elasticity and anelasticity of microcrystalline aluminum samples having various deformation and thermal histories
Elasticity and anelasticity of microcrystalline aluminum samples having various deformation and thermal histories
复制标题
具有各种变形和热历史的微晶铝样品的弹性和迟弹性
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
B. K. Kardashev
中科院分区：
文献类型：
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作者：
V. Betekhtin;A. Kadomtsev;B. K. Kardashev
研究了振动变形幅度对等径角挤压微晶铝试样弹性模量和内摩擦性能的影响。样品具有不同的变形史和热史。研究了试样的弹性和非弹性（微塑性）性能。随着塑性变形程度的增加，杨氏模量E、与幅值无关的衰减量δi和微塑性流变应力σ均增大。随着退火温度的升高，δi和σ显著减小，模量E表现出更复杂的行为。在假设位错迁移率取决于点缺陷谱和内应力的情况下讨论了实验数据，内应力的水平由塑性变形程度和随后的退火温度决定。利用内应力的概念分析了变形程度和退火对试样断裂强度的影响。
The effect of the amplitude of vibrational deformation on the elastic modulus and internal friction of microcrystalline aluminum samples produced by equal-channel angular pressing was studied. The samples have various deformation and thermal histories. The elastic and inelastic (microplastic) properties of the samples are investigated. As the degree of plastic deformation increases, the Young’s modulus E, the amplitude-independent decrement δi, and the microplastic flow stress σ increase. As the annealing temperature increases, the quantities δi and σ decrease noticeably and the modulus E exhibits a more complex behavior. The experimental data are discussed under the assumption that the dislocation mobility depends on both the spectrum of point defects and the internal stresses, whose level is determined by the degree of plastic deformation and the temperature of subsequent annealing. The concept of internal stresses is also used to analyze the data on the effect of the degree of deformation and annealing on the rupture strength of the samples.