Synthesis of Amorphous Matrix Nano-composite in Al-Cu-Mg Alloy
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
The microstructure of as-quenched Al70Cu18Mg12 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.
Abstract
The microstructure of as-quenched Al70Cu18Mg12 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.
참고문헌 (10)
- Aburada T, "Pitting and dealloying of solute-rich Al-Cu-Mg-based amorphous alloys: effect of alloying with minor concentrations of nickel", J. Electrochem. Soc, 158, pp.C253~C265 (2011)
- Greer A L, "Crystallization of metallic glasses", Mat. Sci. Eng. A-Struct, 179, pp.41~45 (1994)
- Greer A L, "Partially or fully devitrified alloys for mechanical properties", Mat. Sci. Eng. A-Struct, 304, pp.68~72 (2001)
- James P F, "Liquid-phase separation in glass-forming systems", J. Mater. Sci, 10, pp.1802~1825 (1975)
- Kim S J, "Exploiting metallic glasses for 19.6%efficient back contact solar cell", Appl. Phys. Lett, 101, pp.064106~ (2012)
- Kündig A A, "In situ formed two-phase metallic glass with surface fractal microstructure", Acta Mater, 52, pp.2441~2448 (2004)
- Louzguine-Luzgin D V, "Investigation of a rapidly solidified Al-based nanocomposite with extremely high number density of precipitates", Mat. Sci. Eng. A-Struct, 449, pp.1026~1028 (2007)
- Mattern N, "Microstructure and thermal behavior of two-phase amorphous Ni–Nb–Y alloy", Scr. Mater, 53, pp.271~274 (2005)
- Park B J, "In situ formation of two amorphous phases by liquid phase separation in Y–Ti–Al–Co alloy", Appl. Phys. Lett, 85, pp.6353~6355 (2004)
- Park B J, "Phase separating bulk metallic glass:a hierarchical composite", Phys. Rev. Lett, 96, pp.245503~ (2006)