Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Long Period Structures and Stacking Faults in Rapidly Solidified Powder Metallurgy (RS P/M) Mg97Zn1Y2 Alloy

급속응고 분말법으로 제조된 Mg97Zn1Y2 합금의 장주기 구조와 적층결함

  • Park, Eun-Kee (Division of Nano Technology, Chungnam National University) ;
  • Kim, Woo-Jung (Division of Nano Technology, Chungnam National University) ;
  • Kim, Taek-Soo (Korea Institute of Industrial Technology) ;
  • Lee, Kap-Ho (Division of Nano Technology, Chungnam National University)
  • 박은기 (충남대학교 공과대학 나노공학부) ;
  • 김우정 (충남대학교 공과대학 나노공학부) ;
  • 김택수 (한국생산기술원 신소재본부) ;
  • 이갑호 (충남대학교 공과대학 나노공학부)
  • Published : 2009.08.27
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Abstract

The long-period stacking order (LPSO) structures and stacking faults (SFs) in rapidly solidified powder metallurgy (RS P/M) $Mg_{97}Zn_1Y_2$ alloy were investigated by high resolution transmission electron microscopy (HRTEM) observations. The 18R-type LPSO structure with a stacking sequence of ACBCBCBACACACBABAB and a period of 4.86 nm was observed in the as-extruded RS P/M $Mg_{97}Zn_1Y_2$ alloy. After annealing at 773 K for 5 hr, the 18R-type LPSO structure was transformed to the 14H-type LPSO structure with a stacking sequence of ABABABACBCBCBC and a period of 3.64 nm. The 24R-type LPSO structure containing 24 atomic layers of ABABABABCACACACABCBCBCBC with period of 6.18 nm coexists with the 14H-type LPSO structure in the same grains. The LPSO structures contain intrinsic Type II SFs such as BCB/CABA and ABA/CBCB stacking sequences of a closely packed plane.

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