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A developmental study in tensile properties of plaster cast A356 aluminum alloy at room and elevated temperature.

机译：石膏浇铸A356铝合金在室温和高温下的拉伸性能的发展研究。

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摘要

Aluminum alloys, such as A356, are widely used by aerospace and automotive industries to reduce weight, increase production, reduce cost, and prevent corrosion of components. Since these components are in high temperature environments, creep behavior is an important design parameter. Understanding A356 at high temperatures provides important information for using the alloy as matrix materials in composites. Casting plaster was the primary mold material in casting A356 with graphite mold material introduced for a comparative study. The plaster has about half the thermal conductivity and one-third the heat diffusivity of sand, making plaster an unusual mold material. Plaster molds provide repeatable results, fine detail and reasonable strength. The experimental heat treatment giving properties most closely resembling T6 for sand castings of A356 gave the values of tensile and yield strengths of 210 MPa and 168 MPa, respectively. The mechanical limits for sand casting alloys for T6 temper of A356 was referenced at tensile and yield strength of 234 and 165 MPa, respectively. Therefore, the yield strength was less than the limit for sand casting, but the yield strength was within the specification. The mechanical properties ranked from highest to lowest, permanent mold > sand mold > insulated mold suggesting that plaster molds act as insulators rather than conductors. Elevated temperature tensile experiments of aluminum alloy A356-T6 was performed at constant load and 0.73, 0.78, 0.87, and 0.92Tm. An Arrhenius rate equation was explored to characterize the behavior for a pair of temperatures via steady state strain rates and activation energies. Overall, the consistency of the tensile specimens suggests plaster casting will work well for future A356 composite tensile specimens and creep behavior of plaster cast specimens.
机译：铝合金（例如A356）已广泛用于航空航天和汽车行业，以减轻重量，提高产量，降低成本并防止部件腐蚀。由于这些组件处于高温环境中，因此蠕变行为是重要的设计参数。了解高温下的A356可为将合金用作复合材料的基质材料提供重要信息。石膏粉是铸造A356的主要模具材料，采用石墨模具材料进行对比研究。灰泥的导热系数约为沙子的一半，热扩散系数为沙子的三分之一，这使灰泥成为一种不寻常的模具材料。石膏模具可提供可重复的结果，精细的细节和合理的强度。实验性热处理的性能与A356的砂铸件最接近T6，其抗拉强度和屈服强度分别为210 MPa和168 MPa。分别以234和165 MPa的拉伸强度和屈服强度为参考，对A356的T6回火砂铸合金的机械极限进行了规定。因此，屈服强度小于砂型铸造的极限，但是屈服强度在规格范围内。机械性能按从高到低的顺序排列，即永久性模具>砂型模具>绝缘模具，这表明石膏模具是绝缘体而不是导体。在恒定负载和0.73、0.78、0.87和0.92Tm下进行铝合金A356-T6的高温拉伸实验。探索了Arrhenius速率方程，以通过稳态应变率和活化能来表征一对温度的行为。总体而言，拉伸试样的一致性表明，石膏浇铸对于未来的A356复合拉伸试样和石膏浇铸试样的蠕变性能将非常有效。

著录项

  • 作者

    Tingler, Kevin.;

  • 作者单位

    Oklahoma State University.;

  • 授予单位 Oklahoma State University.;
  • 学科 Engineering Mechanical.;Engineering Metallurgy.;Engineering Materials Science.
  • 学位 M.S.
  • 年度 2008
  • 页码 116 p.
  • 总页数 116
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;工程材料学;冶金工业;
  • 关键词

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