Applied Microscopy

Korean Society of Microscopy (한국현미경학회)
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Synthesis of Amorphous Matrix Nano-composite in Al-Cu-Mg Alloy

  • Kim, Kang Cheol (Center for Non-crystalline Materials, Department of Materials Science and Engineering, Yonsei University) ;
  • Park, Sung Hyun (Center for Non-crystalline Materials, Department of Materials Science and Engineering, Yonsei University) ;
  • Na, Min Young (Center for Non-crystalline Materials, Department of Materials Science and Engineering, Yonsei University) ;
  • Kim, Won Tae (Department of Optical Engineering, Cheongju University) ;
  • Kim, Do Hyang (Center for Non-crystalline Materials, Department of Materials Science and Engineering, Yonsei University)
  • Received : 2014.09.19
  • Accepted : 2014.09.22
  • Published : 2014.09.30
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Abstract

The microstructure of as-quenched $Al_{70}Cu_{18}Mg_{12}$ alloy has been investigated in detail using transmission electron microscopy. Al nano-crystals about 5 nm with a high density are distributed in the amorphous matrix, indicating amorphous matrix nano-composite can be synthesized in Al-Cu-Mg alloy. The high density of Al nano-crystals indicates very high nucleation rate and sluggish growth rate during crystallization possibly due to limited diffusion rate of solute atoms of Cu and Mg during solute partitioning. The result of hardness measurement shows that the mechanical properties can be improved by designing a nano-composite structure where nanometer scale crystals are embedded in the amorphous matrix.

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References

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