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Free-volume dependent pressure sensitivity of Zr-based bulk metallic glass

Published online by Cambridge University Press:  31 January 2011

Alban Dubach ,
K. Eswar Prasad ,
Rejin Raghavan ,
Jorg F. Löffler ,
Johann Michler  and
Upadrasta Ramamurty
Alban Dubach
Affiliation:
Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland; and EMPA Materials Science and Technology, 3602 Thun, Switzerland
K. Eswar Prasad
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore-560012, India
Rejin Raghavan
Affiliation:
EMPA Materials Science and Technology, 3602 Thun, Switzerland; and Department of Materials Engineering, Indian Institute of Science, Bangalore-560012, India
Jorg F. Löffler
Affiliation:
Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
Johann Michler
Affiliation:
EMPA Materials Science and Technology, 3602 Thun, Switzerland
Upadrasta Ramamurty*
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore-560012, India
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Instrumented indentation experiments on a Zr-based bulk metallic glass (BMG) in as-cast, shot-peened and structurally relaxed conditions were conducted to examine the dependence of plastic deformation on its structural state. Results show significant differences in hardness, H, with structural relaxation increasing it and shot peening markedly reducing it, and slightly changed morphology of shear bands around the indents. This effect is in contrast to uniaxial compressive yield strength, σy, which remains invariant with the change in the structural state of the alloys investigated. The plastic constraint factor, C = H/σy, of the relaxed BMG increases compared with that of the as-cast glass, indicating enhanced pressure sensitivity upon annealing. In contrast, C of the shot-peened layer was found to be similar to that observed in crystalline metals, indicating that severe plastic deformation could eliminate pressure sensitivity. Microscopic origins for this result, in terms of shear transformation zones and free volume, are discussed.

Keywords

AmorphousHardnessMetal
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 8 , August 2009 , pp. 2697 - 2704
Copyright
Copyright © Materials Research Society 2009

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References

1Conner, R.D., Johnson, W.L., Paton, N.E., and Nix, W.D.: Shear bands and cracking of metallic glass plates in bending. J. Appl. Phys. 94, 904 (2003).CrossRefGoogle Scholar
2Castellero, A., Uhlenhaut, D.I., Moser, B., and Löffler, J.F.: Critical Poisson ratio for room-temperature embrittlement of amorphous Mg85Cu5Y10. Philos. Mag. Lett. 87, 383 (2007).CrossRefGoogle Scholar
3Dubach, A., Raghavan, R., Löffler, J.F., Michler, J., and Ramamurty, U.: Micropillar compression studies on a bulk metallic glass in different structural states. Scr. Mater. 60, 567 (2009).CrossRefGoogle Scholar
4Patnaik, M.N.M., Narasimhan, R., and Ramamurty, U.: Spherical indentation response of metallic glasses. Acta Mater. 52, 3335 (2004).CrossRefGoogle Scholar
5Prasad, K. Eswar, Raghavan, R., and Ramamurty, U.: Temperature dependence of pressure sensitivity in a metallic glass. Scr. Mater. 57, 121 (2007).CrossRefGoogle Scholar
6Keryvin, V., Prasad, K. Eswar, Gueguen, Y., Sangleboeuf, J-C., and Ramamurty, U.: Temperature dependence of mechanical properties and pressure sensitivity in metallic glasses below glass transition. Philos. Mag. 88, 1773 (2008).CrossRefGoogle Scholar
7Prasad, K. Eswar, Keryvin, V., and Ramamurty, U.: Pressure sensitive flow and constraint factor in amorphous materials below glass transition. J. Mater. Res. 24, 890 (2009).CrossRefGoogle Scholar
8Raghavan, R., Murali, P., and Ramamurty, U.: Ductile to brittle transition in the Zr41.2Ti13.75Cu12.5Ni10Be22.5 bulk metallic glass. Intermatallics 14, 1051 (2006).CrossRefGoogle Scholar
9Murali, P. and Ramamurty, U.: Embrittlement of a bulk metallic glass due to sub-Tg annealing. Acta Mater. 53, 1467 (2005).CrossRefGoogle Scholar
10Raghavan, R., Ayer, R., Jin, H.W., Marzinsky, C.N., and Ramamurty, U.: Effect of shot peening on the fatigue life of a Zr-based bulk metallic glass. Scr. Mater. 59, 167 (2008).CrossRefGoogle Scholar
11Rabe, R., Breguet, J.M., Schwaller, P., Stauss, S., Huag, F.J., Patscheider, J., and Michler, J.: Observation of fracture and plastic deformation during indentation and scratching inside the scanning electron microscope. Thin Solid Films 469, 206 (2004).CrossRefGoogle Scholar
12Schuh, C.A. and Nieh, T.G.: A nanoindentation study of serrated flow in bulk metallic glasses. Acta Mater. 51, 87 (2003).CrossRefGoogle Scholar
13Moser, B., Löffler, J.F., and Michler, J.: Discrete deformation in amorphous metals: An in situ SEM indentation study. Philos. Mag. 86, 5715 (2006).CrossRefGoogle Scholar
14Keryvin, V.: Indentation of bulk metallic glasses: Relationships between shear bands observed around the prints and hardness. Acta Mater. 55, 2565 (2007).CrossRefGoogle Scholar
15Schuh, C.A., Lund, A.C., and Nieh, T.G.: New regime of homogeneous flow in the deformation map of metallic glasses: Elevated temperature nanoindentation experiments and mechanistic modeling. Acta Mater. 52, 5879 (2004).CrossRefGoogle Scholar
16Zhang, Y., Wang, W.H., and Greer, A.L.: Making metallic glasses plastic by control of residual stress. Nat. Mater. 5, 857 (2006).CrossRefGoogle ScholarPubMed
17Chen, L.Y., Ge, Q., Qu, S., and Jiang, J.Z.: Stress-induced softening and hardening in a bulk metallic glass. Scr. Mater. 59, 1210 (2008).CrossRefGoogle Scholar
18Bhowmick, R., Raghavan, R., Chattopadhyay, K., and Ramamurty, U.: Plastic flow softening in a bulk metallic glass. Acta Mater. 54, 4221 (2006).CrossRefGoogle Scholar
19Oliver, 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, 1564 (1992).CrossRefGoogle Scholar
20Ramamurty, U., Jana, S., Kawamura, Y., and Chattopadhyay, K.: Hardness and plastic deformation in a bulk metallic glass. Acta Mater. 53, 705 (2005).CrossRefGoogle Scholar
21Kachanov, L.M.: Fundamentals of the Theory of Plasticity (Mir Publishers, Moscow, Russia, 1974), p. 22.Google Scholar
22Keryvin, V., Crosnier, R., Laniel, R., Hoang, V.H., and Sangleboeuf, J-C.: Indentation and scratching mechanisms of a ZrCuAlNi bulk metallic glass. J. Phys. D: Appl. Phys. 41, 074029 (2008).CrossRefGoogle Scholar
23Yu, G.S., Lin, J.G., Mo, M., Wang, X.F., Wang, F.H., and Wen, C.E.: Effect of relaxation on pressure sensitivity index in a Zr-based metallic glass. Mater. Sci. Eng., A 460, 58 (2007).CrossRefGoogle Scholar
24Argon, A.S.: Plastic deformation in metallic glass. Acta Metall. 27, 47 (1979).CrossRefGoogle Scholar
25Schuh, C.A., Hufnagel, T.C., and Ramammurty, U.: Mechanical behavior of amorphous alloys. Acta Mater. 55, 4067 (2007).CrossRefGoogle Scholar
26Dubach, A., Torre, F.H. Dalla, and Löffler, J.F.: Constitutive model for inhomogeneous flow in bulk metallic glasses. Acta Materl. 57, 881 (2009).CrossRefGoogle Scholar
27Uhlenhaut, D.I., Torre, F.H. Dalla, Castellero, A., Gomez, C.A.P., Djourelov, N., Krauss, G., Schmitt, B., Patterson, B., and Löffler, J.F.: Structural analysis of rapidly solidified Mg-Cu-Y glasses during room-temperature embrittlement. Philos. Mag. 89, 233 (2009).CrossRefGoogle Scholar
28Xie, S. and George, E.P.: Hardness and shear band evolution in bulk metallic glasses after plastic deformation and annealing. Acta Mater. 56, 5202 (2008).CrossRefGoogle Scholar
29Yoo, B-G., Park, K-W., Lee, J-C., Ramamurty, U., and Jang, J-I.: Role of free volume in strain softening of as-cast and annealed bulk metallic glass. J. Mater. Res. 24, 1405 (2009).CrossRefGoogle Scholar
30Dao, M., Chollacoop, N., Vliet, K.J. Van, Venkatesh, T.A., and Suresh, S.: Computational modeling of the forward and reverse problems in instrumented sharp indentation. Acta Mater. 49, 3899 (2001).CrossRefGoogle Scholar
31Spaepen, F.: A microscopic mechanism for steady state inhomo-geneous flow in metallic glasses. Acta Metall. 25, 407 (1977).CrossRefGoogle Scholar
32Hajlaoui, K., Benameur, T., Vaughan, G., and Yavari, A.R.: Thermal expansion and indentation-induced free volume in Zr-based metallic glasses measured by real-time diffraction using synchro-tron radiation. Scr. Mater. 51, 843 (2004).CrossRefGoogle Scholar
33Wright, W.J., Hufnagel, T.C., and Nix, W.D.: Free volume coalescence and void formation in shear bands in metallic glass. J. Appl. Phys. 93, 1432 (2003).CrossRefGoogle Scholar
34Li, 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: Condens. Matter 65, 144201 (2002).CrossRefGoogle Scholar
35Flores, K.M., Sherer, E., Bharathula, A., Chen, H., and Jean, Y.C.: Sub-nanometer open volume regions in a bulk metallic glass investigated by positron annihilation. Acta Mater. 55, 3403 (2007).CrossRefGoogle Scholar
36Vinogradov, A.Y. and Khonik, V.A.: Kinetics of shear banding in a bulk metallic glass monitored by acoustic emission measurements. Philos. Mag. 84, 2147 (2004).CrossRefGoogle Scholar
37Zberg, B., Arata, E.R., Uggowitzer, P.J., and Löffler, J.F.: Tensile properties of glassy MgZnCa wires and reliability analysis using Weibull statistics. Acta Mater. 57, 3223 (2009).CrossRefGoogle Scholar