Q.P. Cao

Publications (33) View all

• Article: Super elastic strain limit in metallic glass films.

  Q K Jiang, P Liu, Y Ma, Q P Cao, X D Wang, D X Zhang, X D Han, Z Zhang, J Z Jiang
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  ABSTRACT: On monolithic Ni-Nb metallic glass films, we experimentally revealed 6.6% elastic strain limit by in-situ transmission electron microscopy observations. The origin of high elastic strain limit may link with high free volume in the film, causing the rearrangement of loosely bonded atomic clusters (or atoms) upon elastic deformation. This high elastic limit of metallic glass films will shed light on new application fields for metallic glasses, and also trigger more studies for deformation mechanism of amorphous materials in general.
  Scientific Reports 01/2012; 2:852.
• Article: 73 mm-diameter bulk metallic glass rod by copper mould casting

  H. B. Lou, X. D. Wang, F. Xu, S. Q. Ding, Q. P. Cao, K. Hono, J. Z. Jiang
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  ABSTRACT: To be structural materials, the critical size is always a bottleneck of bulk metallic glasses (BMGs) due to the cooling rate restriction. Here, we report a developed alloy of Zr 46 Cu 30.14 Ag 8.36 Al 8 Be 7.5 , which can be cast into amorphous rods in 73 mm diameter by copper mould casting. The strong glass forming ability of this alloy is closely related to the Be addition, which not only suppresses the phase separation happening in the as-cast Be-free BMG but also sustains low Gibbs free energy difference for crystallization. This finding will stimulate more interests in developing BMGs and their industrial applications.
  Applied Physics Letters 09/2011; · 3.84 Impact Factor
• Article: Local strain behavior of bulk metallic glasses under tension studied by in situ x-ray diffraction

  X. D. Wang, J. Bednarcik, H. Franz, H. B. Lou, Z. H. He, Q. P. Cao, J. Z. Jiang
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  ABSTRACT: The uniaxial tensile behavior of Zr62Al8Ni13Cu17, Cu46Zr46Al8, Zr48Cu43Al7Ag2, and La62Al14(Cu5/6Ag1/6)14Co5Ni5 bulk metallic glasses (BMGs) has been investigated by using in situ synchrotron radiation diffraction technique. It is found that the local strain is basically homogeneously distributed at low stress. However, heterogeneity appears obviously when the stress is close to the fracture strength. The amplitude of fluctuation in local strain for four BMGs could relate to the distribution of excess free volume within the medium range order.
  Applied Physics Letters 01/2009; 94(1):011911-011911-3. · 3.84 Impact Factor
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  Article: Effect of microalloying of Nb on corrosion resistance and thermal stability of ZrCu-based bulk metallic glasses

  X P Nie, X M Xu, Q K Jiang, L Y Chen, Y Xu, Y Z Fang, G Q Xie, M F Luo, F M Wu, X D Wang, Q P Cao, J Z Jiang
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  ABSTRACT: a b s t r a c t Bulk metallic glasses (BMGs) of Zr 46Àx Nb x Cu 37.6 Ag 8.4 Al 8 with x = 0, 0.5, 1, 2 and 4 at.% were prepared by copper mould casting. The corrosion resistance of the ZrCu-based BMGs with different Nb contents was carefully examined by weight loss measurements and potentiodynamic polarization tests in 3 mass% NaCl, 1 N HCl and 1 N H 2 SO 4 solutions, respectively. Nb addition improves the newly developed BMGs' corrosion resistance in chloride-containing solutions and the alloys all exhibit excellent corrosion resis-tance in 1 N H 2 SO 4 . The corrosion behavior of the alloy containing 0 and 4 at.% Nb in phosphate-buffered solution was examined by electrochemical polarization tests. The influence of Nb addition on glass form-ing ability (GFA), thermal stability and mechanical property was investigated by X-ray diffraction, differ-ential scanning calorimetry and compression tests, respectively. It is found that the addition of Nb can deteriorate the GFA and thermal stability of the base system, but little effect is observed on the mechan-ical properties, e.g., yielding strength and plasticity, of the ZrCu-based BMG alloys.
  01/2009;
• Article: Atomic structure and glass forming ability of Cu46Zr46Al8 bulk metallic glass

  X. D. Wang, Q. K. Jiang, Q. P. Cao, J. Bednarcik, H. Franz, J. Z. Jiang
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  ABSTRACT: By using a combination of state-of-the-art experimental and computational methods, the high glass forming ability (GFA) of Cu ₄₆ Zr ₄₆ Al ₈ alloy is studied from the view of its atomic packing. Three-dimensional atomic configuration is well established. It is found that Al atoms almost homogeneously distribute around Cu and Zr atoms without segregation, causing the local environment around Cu and Zr atoms in Cu ₄₆ Zr ₄₆ Al ₈ bulk metallic glass different from that of the major competing phase of Cu ₁₀ Zr ₇ . Furthermore, the addition of Al not only increases the amount of icosahedronlike clusters but also makes them more homogeneous distribution, which can enhance the GFA by increasing the structural incompatibility with the competing crystalline phases.
  Journal of Applied Physics 12/2008; · 2.17 Impact Factor