Effect of atomic configuration and liquid stability on the glass-forming ability of Ca-based metallic glasses

Park, E. S.; Kim, D. H.
May 2005
Applied Physics Letters;5/16/2005, Vol. 86 Issue 20, p201912
Academic Journal
In the present study, we report a Ca–Mg–Ni alloy exhibiting significantly improved glass-forming ability (GFA). The Ca60Mg25Ni15 bulk metallic glass (BMG) with a diameter of 13 mm is successfully fabricated by a conventional copper mold casting method in air atmosphere. The ΔTx, Trg, K, and γ parameters exhibit very poor correlation with the GFA. However, the σ parameter exhibits a far better correlation with GFA, indicating that the liquid phase stability and atomic size mismatch dominantly affect the GFA of Ca-based ternary BMGs. The GFA of alkaline-earth-metal-based ternary BMGs such as Ca- and Mg-based BMGs cannot be described properly only by considering thermodynamic and/or kinetic criterion (ΔTx, Trg, K, and γ parameters), but can well be described by considering atomic configuration criterion as well as thermodynamic criterion (σ parameter).


Related Articles

  • Atomic structure in Zr70Cu29Pd1 metallic glass. Yang, L.; Jiang, J. Z.; Liu, T.; Hu, T. D.; Uruga, T. // Applied Physics Letters;8/8/2005, Vol. 87 Issue 6, p061918 

    Local atomic structures of Pd, Cu, and Zr atoms in an as-prepared Zr70Cu29Pd1 glassy alloy and the annealed samples containing icosahedral quasicrystal have been investigated by Pd, Cu, and Zr K-edge extended x-ray absorption fine structure (EXAFS) measurements. It is found that Cu and Zr atoms...

  • Quantification of free volume differences in a Zr44Ti11Ni10Cu10Be25 bulk amorphous alloy. Launey, M. E.; Kruzic, J. J.; Li, C.; Busch, R. // Applied Physics Letters;7/30/2007, Vol. 91 Issue 5, p051913 

    Deformation of metallic glasses requires the existence of free volume to allow atomic movement under mechanical loading. Accordingly, quantification of the free volume state of the alloy is crucial to understand its mechanical behavior. By annealing below the glass transition temperature, the...

  • Atomic packing and short-to-medium-range order in metallic glasses. Sheng, H. W.; Luo, W. K.; Alamgir, F. M.; Bai, J. M.; Ma, E. // Nature;1/26/2006, Vol. 439 Issue 7075, p419 

    Unlike the well-defined long-range order that characterizes crystalline metals, the atomic arrangements in amorphous alloys remain mysterious at present. Despite intense research activity on metallic glasses and relentless pursuit of their structural description, the details of how the atoms are...

  • Instrumented indentation study of plastic deformation in bulk metallic glasses. Li, W. H.; Zhang, T. H.; Xing, D. M.; Wei, B. C.; Wang, Y. R.; Dong, Y. D. // Journal of Materials Research;Jan2006, Vol. 21 Issue 1, p75 

    Mechanical properties and micro-plastic deformation behavior of five bulk metallic glasses (BMGs) were studied by instrumented indentation. These materials included La60Al10Ni10Cu20, Mg65Cu25Gd10), Zr25Al10Ni10Cu15Be12.5, Cu60Zr20Hf10Ti10, and Ni60Nb37Sn3 alloys. Remarkable difference in...

  • The thermodynamics of amorphous phases in immiscible systems: The example of sputter-deposited Nb–Cu alloys. Michaelsen, C.; Gente, C.; Bormann, R. // Journal of Applied Physics;5/1/1997, Vol. 81 Issue 9, p6024 

    Amorphous metallic alloys, frequently observed to occur in systems with large negative heats of mixing, are much less common in systems which are immiscible in the equilibrium solid state, such as Nb-Cu. However, amorphous Nb-Cu alloys can be produced over a wide composition range by sputtering....

  • Al-centered icosahedral ordering in Cu46Zr46Al8 bulk metallic glass. Fang, H. Z.; Hui, X.; Chen, G. L.; Liu, Z. K. // Applied Physics Letters;3/2/2009, Vol. 94 Issue 9, pN.PAG 

    Icosahedral short-range order, of which Al atoms are caged in the center of icosahedra with Cu and Zr atoms being the vertices, has been evidenced in the Cu46Zr46Al8 glassy structure by ab initio molecular dynamics simulation. These Al-centered clusters distribute irregularly in the...

  • Bulkier glass formability enhanced by minor alloying additions. Ma, D.; Cao, H.; Ding, L.; Chang, Y. A.; Hsieh, K. C.; Pan, Y. // Applied Physics Letters;10/24/2005, Vol. 87 Issue 17, p171914 

    In this study, we present a computational thermodynamic strategy to obtain a minor but optimum amount of additional element into a base alloy to improve its glass-forming ability, through thermodynamically calculating the maximum liquidus depressions caused by various alloying addition (or...

  • Bulk metallic glass formation in the binary Cu–Zr system. Wang, D.; Li, Y.; Sun, B.B.; Sui, M.L.; Lu, K.; Ma, E. // Applied Physics Letters;5/17/2004, Vol. 84 Issue 20, p4029 

    Using the Cu-Zr model system, we demonstrate that bulk amorphous alloys can be obtained by copper mold casting even in a binary metallic system. The narrow, off-eutectic, bulk-glass-forming range was found to require composition pinpointing to < 1 at. %. A phase selection diagram is used to...

  • Atomic structure of Al88Y7Fe5 metallic glass. Saksl, K.; Jóvári, P.; Franz, H.; Jiang, J. Z. // Journal of Applied Physics;6/1/2005, Vol. 97 Issue 11, p113507 

    The structure of Al88Y7Fe5 metallic glass has been investigated by differential scanning calorimetry, x-ray powder diffraction, and x-ray absorption fine structure (XAFS) techniques. The amorphous alloy crystallizes according to the following scheme: amorphous →α-Al+ residual amorphous...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics