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首页> 外文学位 >Effect of Green Compact Density on 3Ni-Al and 3Ni-Al-CNT Composite Synthesis Through Electro-Thermal Explosion.
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Effect of Green Compact Density on 3Ni-Al and 3Ni-Al-CNT Composite Synthesis Through Electro-Thermal Explosion.

机译：生坯密度对电热爆炸合成3Ni-Al和3Ni-Al-CNT复合材料的影响。

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摘要

The present study investigates the electrothermal explosion of 3Ni-Al powder and 3Ni-Al-CNT powder at different green compacts density. For 3Ni-Al compact only the nickel powder was mechanically activated prior to reactive processing, whereas for 3Ni-Al-CNTs two-phase milling was carried out for activating the compact mechanically. The effect of green density on the microstructure and phases produced was investigated. Post reaction electric-annealing was also conducted to investigate its effect on product homogenization and densification. The reactions resulted in Ni3Al as the major phase, and green density was found to have limited effect on the product porosity and microstructure. Post reaction electric-annealing resulted in unique microstructures, namely the formation of Ni4.22Al0.9 phase. Microhardness of reacted 3Ni-Al intermetallic and 3Ni-Al-CNT intermetallic composite were evaluated with post reaction annealing. The effect of CNT addition at the level of 5 vol.% content posed a barrier to atomic diffusion and hence limited the reactivity during synthesis resulting in higher porosity levels, however post synthesis electric annealing resulted in materials with lower porosity and higher hardness.
机译：本研究研究了3Ni-Al粉和3Ni-Al-CNT粉在不同生坯密度下的电热爆炸。对于3Ni-Al压块，只有镍粉在反应性处理之前被机械活化，而对于3Ni-Al-CNTs，则进行两相研磨以机械地压紧压块。研究了绿色密度对产生的微观结构和相的影响。还进行了反应后电退火，以研究其对产物均质化和致密化的影响。反应以Ni3Al为主要相，生坯密度对产物的孔隙率和微观结构影响有限。反应后的电退火导致独特的微观结构，即Ni4.22Al0.9相的形成。通过反应后退火评估了反应后的3Ni-Al金属间化合物和3Ni-Al-CNT金属间化合物的显微硬度。以5体积％的含量添加CNT的效果对原子扩散构成障碍，因此限制了合成期间的反应性，从而导致更高的孔隙率水平，但是合成后的电退火导致材料具有更低的孔隙率和更高的硬度。

著录项

  • 作者

    Chauhan, Mehul Dilipbhai.;

  • 作者单位

    San Diego State University.;

  • 授予单位 San Diego State University.;
  • 学科 Mechanical engineering.
  • 学位 M.S.
  • 年度 2018
  • 页码 119 p.
  • 总页数 119
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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