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Mechanical and microstructural characterization of commercial AA5083 aluminum alloys.

机译：商业AA5083铝合金的机械和微观结构表征。

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摘要

The superplastic forming (SPF) process has been of interest to automotive manufacturers for several years because of two imperative goals. The first one is the simplification of the manufacturing process for sheet-body panels and the second reason is to follow government regulations to reduce vehicle mass, by using aluminum. However, the high cost associated with superplastic materials and slow production cycle times have limited the use of SPF to niche automobile manufacturing operations. To overcome these limits, research on SPF has been directed to forming at lower temperatures, at faster strain rates and with lower cost materials. AA5083 superplastic materials hold great promise for high-volume SPF production. However, several technical issues related to the material are still not well understood. The present investigation characterizes the mechanical and microstructural behavior of eight commercial 5083 materials. Conclusive evidence on the deformation mechanisms active in the range of conditions typical for SPF operations, low rates and high temperatures, but also at high-rate and low-temperature conditions, are presented. Predictive equations, useful to establish a predictive basis for SPF forming, are constructed. The issue of cavitation in superplastic materials, leading to poor post-formed properties of the material and ductility variations, is treated. A relation between cavitation, ductility and microstructural features is presented. These results should be quite useful in the development of improved commercial superplastic 5083 materials and for enhancing the capabilities of the SPF process.
机译：由于两个迫切的目标，超塑性成形（SPF）工艺已引起汽车制造商的关注。第一个原因是简化了车身面板的制造工艺，第二个原因是遵循政府法规，通过使用铝减少了汽车的重量。但是，与超塑性材料相关的高成本和较慢的生产周期时间已将SPF的使用限制在特殊的汽车制造业务中。为了克服这些限制，对SPF的研究一直致力于在较低的温度，更快的应变速率下以及使用成本更低的材料进行成形。 AA5083超塑材料对于SPF的批量生产具有广阔的前景。但是，与材料有关的几个技术问题仍未得到很好的理解。本研究表征了八种商用5083材料的机械和微观结构行为。给出了在SPF操作的典型条件范围，低速和高温下以及在高速和低温条件下有效的变形机制的确凿证据。构建了可用于建立SPF形成的预测基础的预测方程。解决了超塑性材料中的气蚀问题，该问题导致材料的后成形性能差和延展性变化。提出了空化，延展性和微观结构特征之间的关系。这些结果对于开发改进的商业超塑性5083材料以及增强SPF工艺的功能将非常有用。

著录项

  • 作者

    Kulas, Mary Anne.;

  • 作者单位

    The University of Texas at Austin.;

  • 授予单位 The University of Texas at Austin.;
  • 学科 Engineering Materials Science.; Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 212 p.
  • 总页数 212
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;机械、仪表工业;
  • 关键词

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