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首页> 外文学位 >Efectos de la deformacion mecanica sobre compuestos de matriz de aluminio tratados termicamente (Spanish text).
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Efectos de la deformacion mecanica sobre compuestos de matriz de aluminio tratados termicamente (Spanish text).

机译：机械变形对热处理的铝基化合物的影响（西班牙语）。

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摘要

A novel aluminum matrix composite reinforced with ceramic particles of AlB2 obtained through a cast process at temperatures below 800°C using commercial alloys of aluminum-boron (5 wt%. B) and aluminum-copper (33.2 wt%. Cu) was characterized. The effects of cold work prior to aging on precipitation hardening were studied using a mixture design experiment combined with split-split plot experiment. Statistical models for the hardness of the composite were produced showing an increase in hardness of the composite due to cold work and aging process as well as higher levels of boron and copper. The aging treatment effect is proportional to the amount of copper present in the material, confirming that hardness and mechanical strength can be adjusted by a combination of cold work and heat treatments. The microstructural analysis showed a good distribution of reinforcements and revealed a pattern of grain subdivision by deformation. Tensile tests were performed to corroborate the results and a dynamic strain aging behavior was observed in a solutionized sample. Finally the fracture surface was analyzed using SEM and optical microscopy, which showed that the predominant failure mode is a combination of brittle and ductile fracture.
机译：表征了一种新型的铝基复合材料，该复合材料由AlB2陶瓷颗粒通过铸造工艺在低于800°C的温度下使用铝硼（5 wt％。B）和铝铜（33.2 wt％。Cu）的商业合金制得。使用混合设计实验和分割样图实验研究了老化前的冷作对沉淀硬化的影响。生成了复合材料硬度的统计模型，该模型显示了由于冷加工和时效过程以及较高含量的硼和铜，导致复合材料硬度增加的原因。时效处理效果与材料中存在的铜量成正比，证明可以通过冷加工和热处理的组合来调节硬度和机械强度。显微组织分析显示出钢筋的良好分布，并揭示了通过变形将晶粒细分的模式。进行拉伸测试以证实结果，并且在溶液化的样品中观察到动态应变时效行为。最后用SEM和光学显微镜对断裂面进行了分析，结果表明，主要的破坏模式是脆性和韧性断裂的结合。

著录项

  • 作者

    Calderon Arteaga, Hermes E.;

  • 作者单位

    University of Puerto Rico, Mayaguez (Puerto Rico).;

  • 授予单位 University of Puerto Rico, Mayaguez (Puerto Rico).;
  • 学科 Engineering Materials Science.; Engineering Mechanical.; Engineering Metallurgy.
  • 学位 M.S.
  • 年度 2004
  • 页码 98 p.
  • 总页数 98
  • 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;冶金工业;
  • 关键词

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