Mg-Zn-Y(ZW61) 합금에서 Icosahedral 준결정상의 석출

곽호연; 이갑호; Ho Yeon Kwak; Kap Ho Lee

Korean Journal of Materials Research, Vol.21, No.3, 168-173, March, 2011

DOI10.3740/MRSK.2011.21.3.168 Export Citation

Mg-Zn-Y(ZW61) 합금에서 Icosahedral 준결정상의 석출

Precipitation of Icosahedral Qusicrystal Phase in Mg-Zn-Y(ZW61) alloy

곽호연, 이갑호^†

충남대학교 나노소재공학과

Ho Yeon Kwak, and Kap Ho Lee^†

Department of Nano Materials Engineering, Chungnam National university, Daejeng 305-764, Korea

E-mail:

Precipitation of the ordered icosahedral quasicrystal in Mg-6wt%Zn-1wt%Y alloy has been characterized by transmission electron microscopy observations. The lamellar-type icosahedral qusicrystal phases (I-phase) with the face-centered icosahedral (FCI) structure are observed in alloy after solution treatment at 550oC. In the alloy annealed at 400oC, polygonshaped I-phases are observed in the α-Mg matrix. The interfaces of the I-phase with the matrix are facetted and the facets are on five-fold and two- fold plane of the I-phase. The orientation relationship of the I-phase with the matrix is determined to be [I5]I//[001]Mg, (2f)I//(210)Mg and [I2]I//[311]Mg, (5f)I//(011)Mg. The icosahedral grains are occasionally found to be twinned with one of the five-fold axis as the twin axis. The twin boundaries appear to be fairly straight and perpendicular to the fivefold twin axis. The icosahedral twin can be expressed as a rotation of 63.4o or 116.6o around two fold zone axis.

Keywords:Mg-Zn-Y alloy;icosahedral quasicrystal phase;orientation relationship;twin structure;high resolution transmission electron microscopy

[References]

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Singh A, Nakamura M, Watanabe M, Kato A, Tsai AP, Scripta Mater., 49, 417 (2003)
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Singh A, Tsai AP, Nakamura M, Watanabe M, Kato A, Phil. Mag. Lett., 83(9), 543 (2003)
Singh A, Watanabe M, Kato A, Tsai AP, Mater. Sci. Eng., A397, 22 (2005)
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Elser V, Phys. Rev., B32, 4892 (1985)
Cahn JW, Shechtman D, Gratias D, J. Mater. Res., 1, 13 (1986)
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Niikura A, Tsai AP, Inoue A, Masumoto T, Phil. Mag. Lett., 69(6), 351 (1994)

[Referenced By]

[1] Zang MX, Kelly PM, Scripta Mater., 48, 379 (2003)

[2] Nie JF, Scripta Mater., 48, 1009 (2003)

[3] Bae DH, Kim SH, Kim DH, Kim WT, Acta Mater., 50, 2343 (2002)

[4] Singh A, Nakamura M, Watanabe M, Kato A, Tsai AP, Scripta Mater., 49, 417 (2003)

[5] Kim WJ, Hong SI, Lee KH, Metals and Materials Int., 16, 171 (2010)

[6] Pierce FS, Poon SJ, Guo Q, Seience, 261, 737 (1993)

[7] Luo Z, Zhang S, Tang Y, Zhao D, Scripta Metall. Mater., 28, 1513 (1993)

[8] Luo ZP, Zhang SQ, Tang YL, Zhao DS, Scripta Metall. Mater., 32, 1411 (1995)

[9] Ebalard S, Spaepen F, J. Mater. Res., 4, 39 (1989)

[10] Kim IJ, Bae DH, Kim DH, Mater. Sci. Eng., A359, 313 (2003)

[11] Baek SY, Lee KH, Kim TS, Korean J. Mater. Res., 18(7), 362 (2008)

[12] Singh A, Tsai AP, Nakamura M, Watanabe M, Kato A, Phil. Mag. Lett., 83(9), 543 (2003)

[13] Singh A, Watanabe M, Kato A, Tsai AP, Mater. Sci. Eng., A397, 22 (2005)

[14] Singh A, Watanabe M, Kato A, Tsai AP, Acta Mater., 53, 4733 (2005)

[15] Shechtman D, Blech I, Garatias D, Cahn JW, Phys. Rev. Lett., 53, 1951 (1984)

[16] Elser V, Phys. Rev., B32, 4892 (1985)

[17] Cahn JW, Shechtman D, Gratias D, J. Mater. Res., 1, 13 (1986)

[18] Hiraga K, J. Electron Microsc., 40, 81 (1991)

[19] Niikura A, Tsai AP, Inoue A, Masumoto T, Phil. Mag. Lett., 69(6), 351 (1994)