Solid-state phase separation in Zr–Y–Al–Co metallic glass


The present study shows that the as-melt-spun Zr28Y28Al22Co22 amorphous ribbon undergoes solid-state phase separation into Zr- and Y-rich regions when heated below the glass transition temperature (Tg). Dynamic mechanical measurements show that two types of low-temperature relaxation occur below Tg, and transmission electron microscopy observation confirms the solid-state phase-separated microstructure. The diffusion coefficient of solid-state phase separation is calculated by the measured separation distance.

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  1. 1

    A.H. Okumura, A. Inoue, T. Masumoto: Heating rate dependence of two glass transitions and phase separation for a La55Al25Ni20 amorphous alloy. Acta Metall. Mater. 41, 915 1993

    CAS  Article  Google Scholar 

  2. 2

    K. Sugiyama, A.H. Shinohara, Y. Waseda, S. Chen, A. Inoue: Anomalous SAXS study on structural inhomogeneity in amorphous Zr33Y27Al15Ni25 alloy. Mater. Trans. Jpn. Inst. Metals 35, 481 1994

    CAS  Google Scholar 

  3. 3

    S. Schneider, P. Thiyagarajan, W.L. Johnson: Formation of nanocrystals based on decomposition in the amorphous Zr41.2Ti13.8Cu12.5Ni10Be22.5 alloy. Appl. Phys. Lett. 68, 493 1996

    CAS  Article  Google Scholar 

  4. 4

    I. Martin, T. Ohkubo, M. Ohnuma, B. Deconihout, K. Hono: Nanocrystallization of Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 metallic glass. Acta Mater. 52, 4427 2004

    CAS  Article  Google Scholar 

  5. 5

    A.A. Kündig, M. Ohnuma, D.H. Ping, T. Ohkubo, K. Hono: In situ formed two-phase metallic glass with surface fractal microstructure. Acta Mater. 52, 2441 2004

    Article  Google Scholar 

  6. 6

    N. Mattern, U. Kühn, A. Gebert, T. Gemming, M. Zinkevich, H. Wendrock, L. Schultz: Microstructure and thermal behavior of two-phase amorphous Ni–Nb–Y alloy. Scripta Mater. 53, 271 2005

    CAS  Article  Google Scholar 

  7. 7

    B.J. Park, H.J. Chang, D.H. Kim, W.T. Kim: In situ formation of two amorphous phases by liquid phase separation in Y–Ti–Al–Co alloy. Appl. Phys. Lett. 85, 6353 2004

    CAS  Article  Google Scholar 

  8. 8

    B.J. Park, H.J. Chang, D.H. Kim, W.T. Kim, K. Chattopadhyay, T.A. Abinandanan, S. Bhattacharyya: Phase separating bulk metallic glass: A hierarchical composite. Phys. Rev. Lett. 96, 245503 2006

    Article  Google Scholar 

  9. 9

    H.S. Chen, D. Turnbull: Formation, stability and structure of palladium-silicon based alloys glasses. Acta Metall. 17, 1021 1969

    CAS  Article  Google Scholar 

  10. 10

    M.L. Williams, R.F. Landel, J.D. Ferry: The temperature dependence of relaxation mechanisms in amorphous polymers and other glass-forming liquids. J. Am. Chem. Soc. 77, 3701 1955

    CAS  Article  Google Scholar 

  11. 11

    K. Schröter, G. Whilde, R. Willnecker, M. Weiss, K. Samwer, E. Donth: Shear modulus and compliance in the range of the dynamic glass transition for metallic glass. Eur. Phys. J. B 5, 1 1998

    Article  Google Scholar 

  12. 12

    H. Okumura, H.S. Chen, A. Inoue, T. Masumoto: Sub-Tg mechanical relaxation of a La55Al25Ni20 amorphous alloy. J. Non-Cryst. Solids 130, 304 1991

    CAS  Article  Google Scholar 

  13. 13

    H. Okumura, H.S. Chen, A. Inoue, T. Masumoto: The observation of two glass transitions in the dynamic mechanical properties of a La55Al25Ni20 amorphous alloy. J. Non-Cryst. Solids 142, 165 1992

    CAS  Article  Google Scholar 

  14. 14

    D.N. Perera, A.P. Tsai: Dynamic tensile measurements for Pt60Ni15P25 below the calorimetric glass transition temperature. J. Phys.: Condens. Matter 11, 3029 1999

    CAS  Google Scholar 

  15. 15

    H.T. Jeong, J-H. Kim, W.T. Kim, D.H. Kim: The mechanical relaxations of a Mm55Al25Ni10Cu10 amorphous alloy studied by dynamic mechanical analysis. Mat. Sci. Eng., A 385, 182 2004

    Article  Google Scholar 

  16. 16

    J.W. Cahn: Phase separation by spinodal decomposition in isotropic systems. J. Chem. Phys. 42, 93 1965

    CAS  Article  Google Scholar 

  17. 17

    R.H. Doremus: Rates of Phase Transformations Academic Press Inc., Orlando, FL 1985 82

    Google Scholar 

  18. 18

    J.W. Cahn, R.W. Charles: The initial stages of phase separation in glasses. Phys. Chem. Glasses 6, 181 1965

    CAS  Google Scholar 

  19. 19

    F. Faupel, W. Frank, M. Macht, H. Mehrer, V. Naundorf, K. Rätzke, H.R. Schober, S.K. Sharma, H. Tichler: Diffusion in metallic glasses and supercooled melts. Rev. Mod. Phys. 75, 238 2003

    Article  Google Scholar 

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We acknowledge support from the Global Research Laboratory Program of Korea Ministry of Science and Technology. Three of the authors (B.J. Park, H.T. Jeong, and S.W. Sohn) are grateful for the support from Second Stage of Brain Korea 21 Project in 2007.

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Correspondence to Won Tae Kim.

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Park, B.J., Sohn, S.W., Kim, D.H. et al. Solid-state phase separation in Zr–Y–Al–Co metallic glass. Journal of Materials Research 23, 828–832 (2008).

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