Applied Microscopy

Korean Society of Microscopy (한국현미경학회)
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Effect of Dealloying Condition on the Formation of Nanoporous Structure in Melt-Spun Al60Ge30Mn10 Alloy

  • Kim, Kang Cheol (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 : 2016.09.22
  • Accepted : 2016.09.24
  • Published : 2016.09.30
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Abstract

Effect of dealloying condition on the formation of nanoporous structure in melt-spun $Al_{60}Ge_{30}Mn_{10}$ alloy has been investigated in the present study. In as-melt-spun $Al_{60}Ge_{30}Mn_{10}$ alloy spinodal decomposition occurs in the undercooled liquid during cooling, leading to amorphous phase separation. By immersing the as-melt-spun $Al_{60}Ge_{30}Mn_{10}$ alloy in 5 wt% HCl solution, Al-rich amorphous region is leached out, resulting in an interconnected nano-porous $GeO_x$ with an amorphous structure. The dealloying temperature strongly affects the whole dealloying process. At higher dealloying temperature, dissolution kinetics and surface diffusion/agglomeration rate become higher, resulting in the accelerated dealloying kinetics, i.e., larger dealloying depth and coarser pore-ligament structure.

Keywords

References

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