Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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HRTEM Study of Precipitation Behavior in Mg-6 wt%Zn-1 wt%Y Alloy

고분해능 전자현미경을 이용한 Mg-6 wt%Zn-1 wt%Y 합금의 석출거동에 관한 연구

  • Baek, Sang-Yeol (Division of Nano Technology, Chungnam National University) ;
  • Lee, Kap-Ho (Division of Nano Technology, Chungnam National University) ;
  • Kim, Taek-Soo (Korea Institute of Industrial Technology(KITECH))
  • 백상열 (충남대학교 공과대학 나노공학부) ;
  • 이갑호 (충남대학교 공과대학 나노공학부) ;
  • 김택수 (한국생산기술연구원 신소재본부)
  • Published : 2008.07.27
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Abstract

The precipitation behavior in Mg-6 wt%Zn-1 wt%Y alloy annealed at different temperatures of $200^{\circ}C$ and $400^{\circ}C$ has been characterized by high resolution transmission electron microscope. When the alloy is annealed at $200^{\circ}C$ for 6 hr, the plate- and the rod-shaped ${\beta}_2'$ phases are precipitated in the matrix. The orientation relationship of plate-shaped precipitates with the matrix exhibits a [$11{\bar{2}}0]{\beta}_2$ || [$10{\bar{1}}0$]Mg, $(0001){\beta}_2'$ || (0001)Mg. While the rod-shaped precipitates have two kinds of the orientation relationships with the matrix, i.e. $[11{\bar{2}}0]{\beta}_2'$||[0001] Mg, $(0001){\beta}_2'||(11{\bar{2}}0)$ Mg and $[11{\bar{2}}0]{\beta}_2'$||[0001] Mg, $({\bar{1}}106){\beta}_2'||(10{\bar{1}}0)$ Mg. With increasing annealing time at $200^{\circ}C$ the ${\beta}_1'$ phases are also precipitated in the matrix and the orientation relationship exhibits a $[010]{\beta}_1'$ || [0001]Mg, $(603){\beta}_1'$ || ($01{\bar{1}}0$)Mg between the ${\beta}_1'$ precipitate and the matrix. The icosahedral phases are precipitated in the alloy annealed at $400^{\circ}C$ and exhibit a $[I2]_I$ || [0001]Mg relationship with the matrix.

Keywords

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