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    0030232

    mmse @ 2009-07-06 12:57



    1. Nonlinear tensile deformation behavior of small-sized metallic glasses
    Pages 564-567
    Y. Wu, H.X. Li, G.L. Chen, X.D. Hui, B.Y. Wang, Z.P. Lu

    2. Room temperature ageing of Al–Ni–RE (RE = La, Gd, Er) metallic glasses
    Pages 588-591
    Rina Sahu, A.K. Gangopadhyay, K.F. Kelton, S. Chatterjee, K.L. Sahoo

    3. A novel structural gradient metallic glass composite with enhanced mechanical properties
    Pages 608-611
    J.T. Fan, A.Y. Chen, M.W. Fu, J. Lu

    4. Stress-induced structural inhomogeneity and plasticity of bulk metallic glasses
    Pages 640-643
    H.B. Yu, J. Hu, X.X. Xia, B.A. Sun, X.X. Li, W.H. Wang, H.Y. Bai



     
    mmse @ 2009-07-06 09:05



    An atomistic modeling of the Cu-Zr-Ag bulk metallic glass system

    Kyung-Han Kanga, Inyoung Saa, Jae-Chul Leeb, Eric Fleuryc and Byeong-Joo Leea

    aDepartment of Materials Science and Engineering,Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
    bDepartment of Materials Science and Engineering, Korea University, Seoul 136-701, Republic of Korea
    cAdvanced Metals Research Center, Korea Institute of Science and Technology, Seoul 130-650, Republic of Korea

    Received 12 May 2009; revised 30 June 2009; accepted 1 July 2009. Available online 4 July 2009.


    Abstract

    In order to investigate the phase separation behavior in Cu-Zr-Ag bulk metallic glasses (BMGs) on an atomic-level, a modified embedded-atom method (MEAM) interatomic potential for the Cu-Zr-Ag system has been newly developed. A clear tendency of phase separation of Ag-rich phases could be observed in the supercooled liquid, in reasonable agreement with experimental information. The potential can be used for atomistic investigations of the effects of alloying element, Ag, on a wide range of amorphous properties of Cu-Zr BMGs.

    Keywords: Cu-Zr-Ag; bulk metallic glasses; MEAM potential; atomistic simulation; phase separation




     
    mmse @ 2009-07-03 08:16



    Structure, morphology and magnetic properties of Fe–B–Si–Nb glassy alloy thin film prepared by a pulsed laser deposition method
    Pages 1895-1897
    Kana Takenaka, Toshio Sugimoto, Nobuyuki Nishiyama, Akihiro Makino, Yasunori Saotome, Yoshihiko Hirotsu, Akihisa Inoue



     
    mmse @ 2009-07-03 08:13



    Catching Fe-based bulk metallic glass with combination of high glass forming ability, ultrahigh strength and good plasticity in Fe–Co–Nb–B system
    Pages 246-248
    Z.Y. Chang, X.M. Huang, L.Y. Chen, M.Y. Ge, Q.K. Jiang, X.P. Nie, J.Z. Jiang



     
    mmse @ 2009-07-02 14:56



    Communication

    Transition of Failure Mode and Enhanced Plastic Deformation of Metallic Glass by Multiaxial Confinement

    Fu-Fa Wu 1 2 *, Zhe-Feng Zhang 1 *, Scott Xing-Yuan Mao 3

    1Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences 72 Wenhua Road, Shenyang 110016, China
    2School of Materials and Chemical Engineering, Liaoning University of Technology 169 Shiying Street, Jinzhou, 121001, China
    3Department of Mechanical Engineering and Materials Science, University of Pittsburgh 648 Benedum Hall, Pittsburgh, PA 15261, USA

    Abstract

    Multiple shear bands are formed in a confined metallic-glass specimen under small-punch loading. The intersecting of shear bands and the formation of profuse secondary shear bands are promoted under this confinement; accordingly, the failure mode changes from catastrophic fracture to stable multiple shear banding. Multiaxial confinement is an effective method to stabilize shear banding and further enhance the mechanical performance, especially the plastic deformation capability of metallic glass. These results present a simple step for making shear banding more stable and exploiting the shear-deformation capability of metallic glasses, leading to the toughening of brittle metallic glasses and potentially broadening their applications. 

    Keywords

    metallic glasses • shear bands • plasticity • fracture



     
    mmse @ 2009-07-02 09:03



    1. Microstructure and electrochemical behavior of Ti-coatedZr55Al10Ni5Cu30 bulk metallic glass
    Pages 945-950
    F.X. Qin, X.M. Wang, G.Q. Xie, K. Wada, M. Song, K. Furuya, K. Asami, A. Inoue

    2. A study on the surface severe plastic deformation behavior of a Zr-based bulk metallic glass (BMG)
    Pages 951-957
    J.W. Tian, L.L. Shaw, Y.D. Wang, Y. Yokoyama, P.K. Liaw

    3. Effect of mischmetal substitution on the glass-forming ability of Mg–Ni–La bulk metallic glasses
    Pages 968-971
    S. González, I.A. Figueroa, H. Zhao, H.A. Davies, I. Todd, P. Adeva



     
    mmse @ 2009-07-01 11:16



    Nanocrystalline–amorphous transitions in Al–Mo thin films: Bulk and surface evolution

    C. Ophusa, b, E.J. Lubera, b, M. Edelenc, Z. Leed, L.M. Fischerb, e, S. Evoyb, e, D. Lewisc, U. Dahmend, V. Radmilovicd and D. Mitlina, b

    aDepartment of Chemical and Materials Engineering, University of Alberta, Canada
    bNational Institute for Nanotechnology, Edmonton, AB, Canada
    cDepartment of Materials Science and Engineering, Rensselaer, Polytechnic Institute, Troy, NJ, USA
    dNational Center for Electron Microscopy, Lawrence Berkeley Lab, Berkeley, CA, USA
    eDepartment of Electrical and Computer Engineering, University of Alberta, Canada

    Received 7 October 2008; revised 24 May 2009; accepted 29 May 2009. Available online 29 June 2009.


    Abstract

    We investigate the bulk and surface features of the crystalline–amorphous transitions in binary Al–Mo alloy thin films as a function of Mo composition using transmission electron microscopy, X-ray diffraction and atomic force microscopy analysis, as well as thermodynamic modeling. Of the alloys tested, the minimum in the root mean square (rms) surface roughness and correlation length occurs at the Al–32 at.% Mo composition, which corresponds to the maximum volume fraction of the amorphous phase and the minimum volume fraction of the body centered cubic nanocrystallites. The rms surface roughness of the 32 at.% Mo films is on the order of a single nanometer, compared with nearly 80 nm for the 50 at.% Mo film. A structure–zone map is constructed to relate the surface morphology of the films to their bulk microstructure. A thermodynamic model developed by Miedema and coworkers was used to predict the general trends observed in the microstructural evolution as a function of film composition.

    Keywords: Nanocomposite; Metallic glasses; Nanocrystalline materials; Surface roughness; High-resolution electron microscopy




     
    mmse @ 2009-07-01 08:21



    1. High-pressure behaviors of Yb-based bulk metallic glass
    Pages 453-456
    J.Q. Wang, H.Y. Bai

    2. Enhancement of plasticity in Zr-base bulk metallic glass by soft metal plating
    Pages 481-484
    Young Chul Choi, Sun Ig Hong

    3. Oxygen embrittlement in a Cu–Hf–Al bulk metallic glass
    Pages 540-543
    S.V. Madge, T. Wada, D.V. Louzguine-Luzgin, A.L. Greer, A. Inoue



     
    mmse @ 2009-06-30 14:19



    Influence of Ta, Y substitutions on the thermal stability, microhardness and magnetic properties of melt spun Fe–B–Si amorphous alloys
    Pages 1202-1205
    I. Betancourt, S. Baez



     
    mmse @ 2009-06-30 08:39



    1. Characteristics of near-eutectic and off-eutectic Zr–Al–Ni–Cu glass forming alloys
    Pages 100-102
    An-hui. Cai, Xiang Xiong, Yong Liu, Jiang-hong Li, Wei-ke An, Yun Luo

    2. A comparison of the nucleation and growth of shear bands in Ti and Zr-based bulk metallic glasses by in-situ tensile tests
    Pages 148-153
    W.G. Zhang, Y. Zhang, G.J. Hao, J.P. Lin



     
    mmse @ 2009-06-29 08:37



    Effect of Crystalline Phases on Deformation and Warm Formability of a Bulk Metallic Glass Composite within Supercooled Liquid Region

    Hyun-Joon Juna, Kwang Seok Leeb, Uta Kühnc, Jürgen Eckertc, d and Young Won Changa

    aDepartment of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, South Korea
    bDepartment of Materials Processing, Applied Plasticity Research Group, 531 Changwondaero, Changwon, Gyeongnam 641-831, South Korea
    cIFW Dresden, Institute for Complex Materials, P.O. Box 270116, D-01171 Dresden, Germany
    dInstitute of Materials Science, Dresden University of Technology, D-01062 Dresden, Germany

    Received 28 April 2009; accepted 19 June 2009. Available online 27 June 2009.

    Abstract

    The thermal and mechanical properties of a Zr66.4Nb6.4Cu10.5Ni8.7Al8.0 bulk metallic glass composite (BMGC) have been investigated. The thermal properties were determined by using a differential scanning calorimeter (DSC), while the phase and composition analysis of crystalline precipitates within glassy matrix were carried out by X-ray diffraction (XRD). The deformation behavior has also been investigated through a series of compression tests performed under several strain rates between 10−4 /s and 10−2 /s at various temperatures within supercooled liquid region (SLR). This BMG composite was found to have improved high temperature strength compared to other Zr-based monolithic BMGs. The in-situ formed crystalline phases are believed to hinder the viscous flow of glassy matrix to raise the high temperature strength, compensating more the minor softening of crystalline phases at higher temperatures within the SLR. The warm formability of the composite was also estimated by applying the dynamic materials model (DMM) and the results were verified by subsequent laboratory-scale extrusion tests.

    Keywords: Bulk metallic glass composite; Supercooled liquid region; Warm Formability; Extrusion




     
    mmse @ 2009-06-29 08:34



    Letter to the Editor

    On the role of liquid phase stability and GFA parameters

    Vikas Jindala, V.C. Srivastavab, c and Volker Uhlenwinkelc

    aDepartment of Metallurgical Engineering, Banaras Hindu University, Varanasi 221005, India
    bNational Metallurgical Laboratory, Jamshedpur 831007, India
    cInstitut fuer Werkstofftechnik, Universitaet Bremen, Badgasteiner Str. 3, 28359 Bremen, Germany

    Abstract

    Role of liquid phase stability on the glass forming ability (GFA) has been reviewed and the alloy systems have been analyzed by introducing a contribution factor (wg) to the characteristic temperature Tg, in the γ parameter. The kinetics of glass formation for various alloy systems has been found to vary with liquid phase stability in metastable state. The GFA of a fragile liquid is found to be more responsive to the contribution of metastable stability compared to strong liquid.

    Keywords: Liquid alloys and liquid metals; Glass transition


    Received 16 July 2008. Available online 26 June 2009.