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Mechanical properties of nanostructured amorphous metal multilayer thin films

  • J.B. Vella (a1), A.B. Mann (a2), H. Kung (a3), C.L. Chien (a4), T.P. Weihs (a1) and R.C. Cammarata (a1)...


The hardness of amorphous metal multilayered films was investigated by nanoindenation. Bilayer material systems of amorphous CuNb, FeB, and FeTi were produced by dc sputtering on 〈112 ̄0〉 sapphire substrates to a total thickness of 1 μm. The bilayer periods (Λ) ranged from 2 to 50 nm. The films’ noncrystallinity was verified by x-ray diffraction (XRD) and electron diffraction. The layer structure was verified by transmission electron microscopy and grazing angle XRD. The hardness and elastic modulus properties of the films, measured by nanoindentation, were shown to be statistically equivalent to the rule mixtures predictions. The hardness behavior is in contrast with the behavior of crystalline multilayered films, which generally display significant enhancements as the bilayer period is decreased below 10 nm. The lack of a significant hardness variation in the amorphous films strongly suggests that dislocation-mediated mechanisms do not govern inhomogeneous flow in amorphous metals.



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1Was, G.S. and Foeke, T.: Deformation and fracture in microlaminates. Thin Solid Films 286, 1 (1996).
2Shinn, M., Hultman, L. and Barnett, S.A.: Growth, structure, and microhardness of epitaxial TiN/NbN superlattices. J. Mater. Res. 4, 1 (1992).
3Oberle, R.R. and Cammarata, R.C.: Dependence of hardness on modulation amplitude in electrodeposited Cu-Ni compositionally modulated thin films. Scripta Met. 32, 583 (1995).
4Helmerson, U., Todorova, SS.A, Barnett, Sundgren, J.E., Markert, L.C. and Greene, J.E.: Growth of single-crystal TiN/VN strained-layer superlattices with extremely high mechanical hardness. J. Appl. Phys. 62, 481 (1987).
5Bunshah, R.F., Nimmagadda, R., Doerr, H.J., Movchan, B.A., Grechanuk, N.I. and Dabizha, E.V.: Structure and property relationships in microlaminate Ni-Cu and Fe-Cu condensates. Thin Solid Films 72, 261 (1980).
6Daniels, B.J., Nix, W.D. and Clemens, B.M.: in Polycrystalline Thin Films: Structure, Texture, Properties, and Applications, edited by Barmak, K., Parker, M.A., Floro, J.A., Sinclair, R., and Smith, D.A. (Mater. Res. Soc. Symp. Proc. 343, Pittsburgh, PA, 1994) p. 549
7Embury, J.D. and Hirth, J.P.: On dislocation storage and the mechanical response on fine scale microstructures. Acta Metall. Mater. 6, 42 (1992).
8Koehler, J.S.: Attempt to design a strong solid. Phys. Rev. B 2, 547 (1970).
9 E.O. Hall: The deformation and aging of mild steel. Proc. Phys. Soc. of London B 64, 747 (1951).
10Petch, N.J.: The cleavage of polycrystals. J. Iron Steel Inst. 174, 25 (1953).
11Hoagland, R.G., Mitchell, T.E., Hirth, J.P. and Kung, H.: On the strengthening effects of interfaces in multilayer fcc metallic composites, Philos. Mag. A 82, 643 (2002).
12Shinn, M. and Barnett, S.A.: Effect of superlattice layer elastic moduli on hardness. Appl. Phys. Lett. 64, 61 (1994).
13Tabor, D.The Hardness of Metals (Clarendon Press, Oxford University, 1951).
14Gilman, J.J.: Dislocation Dynamics, edited by Rosenfield, A.R., Hahn, G.T., Bemut, A.L. Jr., and Jafee, R.I. (McGraw-Hill, New York, 1968), pp. 325.
15Gilman, J.J.: Flow via dislocations in ideal glasses. J. Appl. Phys. 44, 675 (1973).
16Davis, L.A. Mechanical responses of metallic glasses, In Metallic Glasses (American Society for Metals, Metals Park, OH, 1976) p. 190.
17Li, J.C.M.: Metallic Glasses , ASM Seminar, 1976 , Niagara Falls, pp. 224226.
18Li, J.C.M.: Dislocations in amorphous metals. Met. Trans. A 16A, 2227 (1985).
19Chaudhari, P., Levi, A. and Steinhardt, P.: Edge and screw dislocations in an amorphous solid. Phys. Rev. Lett. 43, 1517 (1979).
20Li, J.C.M. Micromechanicanisms of deformation and fracture, In Metallic Glasses (ASM, Metals Park, OH, 1978).
21Davis, L.A., Das, S.K., Li, J.C.M. and Zedalis, M.S.: Mechanical properties of rapidly solidified amorphous and microcrystalline materials: A review. Int. J. Rapid Solidification. 8, 73 (1994).
22Chen, H., He, Y., Shiflet, G.J. and Poon, S.J.: Deformation-induced nanocrystal formation in shear bands of amorphous alloys. Nature 367, 541 (1994).
23Pampillo, C.A.: Review: Flow and fracture in amorphous alloys. J. Mater. Sci. 10, 1194 (1975).
24Spaepen, F. and Turnbull, D.: A mechanism for the flow and fracture of metallic glasses. Scripta Met. 8 563 (1974).
25Li, J., Wang, Z.L. and Hufnagel, T.C.: Characterization of nanometer-scale defects in metallic glasses by quantitative high-resolution transmission electron microscopy. Phys. Rev. B 65, 144201 (2002).
26Wright, W.J., Hufnagel, T.C. and Nix, W.D.: Free volume coalescence and void formation in shear bands in metallic glasses. J. App. Phys. 93, 1432 (2003).
27Flores, K.M. and Dauskardt, R.H.: Local heating associated with crack plasticity in Zr-Ti-Ni-Cu-Be bulk amorphous metals. J. Mater. Res. 14, 638 (1999).
28Flores, K.M., Suh, D., Howell, R., Asoka-Kumar, P., Sterne, P.A. and Dauskardt, R.H.: Flow and fracture of bulk metallic glass alloys and their composites. Materials Trans. JIM 42, 619 (2001).
29Oliver, W.C. and Pharr, G.M.: An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments. J. Mater. Res. 7, 6 (1992).
30Shuh, C.A. and Nieh, T.G.: A survey of instrumented indentation studies on metallic glasses. J. Mater. Res. 19, 46 (2004).
31Tsui, T.Y., Oliver, W.C. and Pharr, G.M.: Influences of stress on the measurement of mechanical properties using nanoindentation: part I: Experimental studies in an aluminum alloy. J. Mater. Res. 11,3, 752 (1996).
32Joslin, D.L. and Oliver, W.C.: A new method for analyzing data from continuous depth-sensing microindentation tests. J. Mater. Res. 5, 123 (1990).


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Mechanical properties of nanostructured amorphous metal multilayer thin films

  • J.B. Vella (a1), A.B. Mann (a2), H. Kung (a3), C.L. Chien (a4), T.P. Weihs (a1) and R.C. Cammarata (a1)...


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