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Ma G.,CAS Shenyang Institute of Metal Research | Zhu Z.,CAS Shenyang Institute of Metal Research | Wang Z.,Shenyang Kejin Advanced Material Company Ltd | Zhang H.,CAS Shenyang Institute of Metal Research
Journal of Materials Science and Technology | Year: 2015

The stress-strain relations for the Zr53.5Cu26.5Ni5Al12Ag3 bulk metallic glass (BMG) over a broad range of temperatures (room temperature to its supercooled liquid region) and strain rates (10-4 to 10-1s-1) were established in uniaxial compression using a thermal-mechanical simulation system. The superplastic flow was seen above its glass transition temperature (T g=694K) and strain rates of up to 10-1s-1 from the variation of stress-strain curves. A deformation map of strain rate vs temperature of Zr53.5Cu26.5Ni5Al12Ag3 was obtained, which was mainly composed of homogeneous and inhomogeneous deformation regions, the former featuring either Newtonian or non-Newtonian flow while the latter characterizing linear elastic behavior followed by shear localization, respectively. A phenomenological constitutive equation used to describe a master curve of viscosity with respect to the strain rate was obtained by fitting the experimental results, which determines the viscosity of the present alloy at the temperature near and above T g. The results show the Zr53.5Cu26.5Ni5Al12Ag3 BMG is the subject suitable for net shape forming process at the supercooled liquid region. © 2015.

Fan X.,CAS Shenyang Institute of Metal Research | Gao H.,Shenyang Kejin Advanced Material Company Ltd | Zhong L.,Ocean University of China | Xu H.,Ocean University of China | And 2 more authors.
RSC Advances | Year: 2014

A polyaniline/modified graphite composite electrode (PANi/MGE) was prepared through electrochemical deposition. In spite of no apparent thread-like PANi, the electrochemical tests demonstrate that the PANi/MGE possesses excellent pseudo-capacitive performance and ratio characteristics, with an apparent specific capacitance reaching up to 276 F g-1, which might be attributed to the synergistic effect between PANi and MGE. This journal is © The Royal Society of Chemistry.

Ma G.,CAS Shenyang Institute of Metal Research | Fu H.,CAS Shenyang Institute of Metal Research | Wang Z.,Shenyang Kejin Advanced Material Company Ltd | Xu Q.,Daqing Petrochemical Company | Zhang H.,CAS Shenyang Institute of Metal Research
Jinshu Xuebao/Acta Metallurgica Sinica | Year: 2014

Different volume fractions of 304 stainless steel capillary tubes/Zr53.5Cu26.5Ni5Al12Ag3 metallic glass composites were prepared using infiltration method. Their properties and deformation behaviors were investigated systematically. The mechanical properties were performed on materials test machine. Surfaces and fracture morphologies were examined using white light interferometer, X- ray 3D imaging and SEM techniques. The results show that the ductility of composites was improved. The compressive strain of composite reaches 20% when the volume fraction is 34%. The deformation involves obvious work hardening. The amount of work hardening depends on the content of tubes. The composite fails in the shear mode along 45°. The split and debonding of tubes and interfaces act as the propagation way of crack. The amount of shear bands increase as the volume fraction increases. The shear deformation of amorphous in tubes falls behind that out tubes. © Copyright.

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