TITLE

Amorphous alloys formed by microsecond current pulses

AUTHOR(S)
Clemens, B. M.; Gilgenbach, R. M.; Bidwell, S.
PUB. DATE
March 1987
SOURCE
Applied Physics Letters;3/2/1987, Vol. 50 Issue 9, p495
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report the use of microsecond current pulses to transform layered crystalline nickel-zirconium films to amorphous alloy. Starting material was electron beam deposited multilayers with a composition modulation wavelength of 34 nm, an average composition of Ni63Zr37, and a total thickness of 680 nm. Electrical pulses were approximately rectangular and about 3 μs in duration, with an intensity of several hundred amperes, directly coupling 1.6 to 3 J of energy uniformly into the film. By monitoring current and voltage, the reaction and melting of the sample were observed, and the total energy of the pulse was easily computed. A sharp threshold in pulse energy for sample transformation was observed. A simple heat flow calculation demonstrated that the chemical energy released by the reaction, and the change in diffusion kinetics as the sample temperature exceeded the glass transition temperature of the amorphous alloy, are responsible for this sudden onset. The maximum temperature estimated from this calculation is below the melting point of the constituents, and the cooling rate is 107–108 K/s which is in agreement with the formation of amorphous alloy.
ACCESSION #
9822257

 

Related Articles

  • Magnetic ordering of Dy in NiFe—Dy bilayer films. Édel’man, I. S.; Khudyakov, A. E.; Zabluda, V. N.; Markov, V. V.; Romanova, O. B. // JETP Letters;3/10/98, Vol. 67 Issue 5, p339 

    The first results of measurements of the temperature and spectral dependences of the circular magnetic dichroism in NiFe–Dy bilayer films are reported. These results show that even at room temperature Dy in such systems is ordered ferromagnetically to a large depth (∼600 Å). ©...

  • Magnetization Distribution in Submicrometer Iron–Nickel Antidot Arrays Patterned by a Focused Ion Beam. Toporov, A. Yu. // Technical Physics;Sep2002, Vol. 47 Issue 9, p1199 

    Antidots of size 0.5 μm are prepared by patterning iron-nickel films with a focused ion beam. The magnetization distribution in antidot arrays is examined with Lorentz transmission electron microscopy. It is shown that one side of the array makes an angle of about 20° with the easy...

  • Anodically grown films on copper and copper�nickel alloys in slightly alkaline solutions. Brizuela, F.; Procaccini, R.; Cer�, S.; V�zquez, M. // Journal of Applied Electrochemistry;May2006, Vol. 36 Issue 5, p583 

    Surface oxides grown on copper and copper�nickel alloys (UNS 72000 and UNS 70600) in aerated borax-borate buffer solution of pH 7.7 were characterized using various experimental techniques. Their influence on the mechanism of oxygen reduction was also investigated. The composition of the...

  • Unexpected unidirectional anisotropy in amorphous Tb-Fe/Ni-Fe-Mo bilayer films. Hellman, F.; van Dover, R. B.; Gyorgy, E. M. // Applied Physics Letters;2/2/1987, Vol. 50 Issue 5, p296 

    The exchange interaction between amorphous Tb-Fe (a-Tb-Fe) and crystalline Ni-Fe-Mo produces a unidirectional anisotropy in the magnetically soft Ni-Fe-Mo layer. This anisotropy appeared anomalous because the magnetizations of the layers were previously believed to be orthogonal to each other....

  • Magnetic properties of (111) oriented Ni1-xFex alloy thin films (abstract). Freeland, J.W.; Grigorov, I.L. // Journal of Applied Physics;4/16/1997, Vol. 81 Issue 8, p3897 

    Presents an abstract of a study on magnetic properties of (111) oriented Ni1-xFex alloy thin films. Changes in the magnetic properties of 4 ML face-centered cubic (fcc) Ni-Fe thin films as a function of Fe concentration; Epitaxial growth of films; Use of copper substrates to stabilize the fcc...

  • Effect of weak electric fields on the conduction in thin metal films. Boltaev, A. P.; Pudonin, F. A. // Journal of Experimental & Theoretical Physics;Sep2006, Vol. 103 Issue 3, p436 

    The variation of conduction in island metallic Ti, Co, W, and FeNi films in weak electric field is studied. The variation of the differential conductivity of island metallic films with an electric field at temperatures from T = 77 to 300 K is measured, as well as the temperature dependence of...

  • Influence of He-ion irradiation on thin NiMn/FeNi exchange bias films. Cantelli, V.; von Borany, J.; Grenzer, J.; Fassbender, J.; Kaltofen, R.; Schumann, J. // Journal of Applied Physics;4/15/2006, Vol. 99 Issue 8, p08C102 

    Using synchrotron x-ray diffraction and reflectivity, we studied the transition from the paramagnetic NiMn phase to the chemically ordered, antiferromagnetic L10 phase of NiMn/Fe19Ni81 thin films deposited on a Si/SiO2 substrate as a function of the annealing temperature. The transformation to a...

  • Elemental and phase composition analysis of hydrogen-sensitive Pd/Mg—Ni films. Tang, Y. M.; Ong, C. W. // Applied Physics A: Materials Science & Processing;Jun2008, Vol. 91 Issue 4, p701 

    A magnesium–nickel (Mg–Ni) film with a palladium (Pd) overcoat is switchable between a conducting metallic state and a semiconducting state through hydridation and dehydridation processes. The Pd overcoat is added to suppress possible oxidation of the alloy layer. However, some Pd...

  • Interfacial reactions between Sn-3.5 Ag solder and Ni-W alloy films. Haseeb, A. S. M. A.; Chew, C. S.; Johan, Mohd Rafie // Journal of Materials Science: Materials in Electronics;Sep2011, Vol. 22 Issue 9, p1372 

    Nickel based alloys are currently being investigated in an effort to develop stable barrier films between lead free solder and copper substrate. In this study, interfacial reactions between Ni-W alloy films and Sn-3.5 Ag solder have been investigated. Ni-W alloys films with tungsten content in...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics