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Evolution of yield surfaces and texture with finite plastic deformation in aluminum alloys.

机译：铝合金在有限塑性变形下屈服面和织构的演变。

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摘要

The primary objectives of this study are to determine the (i) evolution of subsequent yield surfaces based on 10muepsilon deviation from linearity; and (ii) to report a comprehensive study of anisotropy and texture evolution with finite plastic deformation. The first study gives comprehensive experimental results on subsequent yield surfaces of a high work hardening alloy under proportional and non proportional loading paths. The size of yield surfaces under non-proportional loading decrease and no cross-effect is observed; these yield surfaces are completely different under proportional loading where the size of the yield surfaces increase and show positive cross-effect. The experimental results on subsequent yield surfaces after proportional loading paths under tension-tension stress space, for a very low and a very high work hardening Al alloy, using 10muepsilon deviation from linearity as the definition of yield are presented. Subsequent yield surfaces are determined under axial, hoop, and combined hoop and axial proportional loading directions at various levels of plastic strain in each direction. Elastic moduli are also determined within each subsequent yield surface.;Further, comprehensive responses of Al5754 and AZ31 are measured over wide ranges of strain rates and temperatures on same batch of two materials. These include the strain hardening, anisotropy, and texture evolution with finite plastic deformation. Tension, compression, and simple shear experiments at wide ranges of strain rates and temperatures are performed in rolling, transverse to rolling, and 45° to rolling directions. In addition, compression experiments were also performed in thickness direction. A new simple shear device is fabricated to perform simple shear experiments at elevated temperatures. Texture measurements are performed using neutron diffraction and EBSD in order to understand the deformation mechanisms of various specimens after finite deformation.
机译：这项研究的主要目的是确定（i）基于10muepsilon线性偏差的后续屈服面的演变； （ii）报告有限塑性变形下各向异性和织构演化的综合研究。第一项研究给出了在比例和非比例载荷路径下，高工作硬化合金随后的屈服面的综合实验结果。非比例载荷下屈服面的尺寸减小，没有观察到交叉效应。在比例载荷下，这些屈服面完全不同，其中屈服面的尺寸增加并显示出正的交叉效应。给出了在拉-拉应力空间下，按比例加载路径之后的后续屈服面的实验结果，对于一个非常低和非常高的加工硬化铝合金，以线性的10muepsilon偏差作为屈服的定义。随后的屈服面是在轴向，环向以及组合的环向和轴向比例载荷方向下确定的，各个方向上的塑性应变水平不同。还可以在每个后续屈服面内确定弹性模量。此外，在两种材料的同一批次中，在较大的应变速率和温度范围内，测量了Al5754和AZ31的综合响应。这些包括应变硬化，各向异性和具有有限塑性变形的纹理演变。在宽范围的应变速率和温度下，以横向，横向和横向45°的方向进行拉伸，压缩和简单剪切实验。另外，还沿厚度方向进行了压缩实验。制造了一种新的简单剪切装置，以在高温下进行简单剪切实验。使用中子衍射和EBSD进行纹理测量，以了解有限变形后各种样本的变形机理。

著录项

  • 作者

    Pandey, Amit.;

  • 作者单位

    University of Maryland, Baltimore County.;

  • 授予单位 University of Maryland, Baltimore County.;
  • 学科 Engineering Automotive.;Engineering Materials Science.;Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 172 p.
  • 总页数 172
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自动化技术及设备;机械、仪表工业;工程材料学;
  • 关键词

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