Decomposition mechanism in supercooled liquid alloys.

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The authors performed small-angle neutron scattering experiments on the bulk amorphous alloy Zr{sub 41.2}Ti{sub 13.8}Cu{sub 12.5}Ni{sub 10}Be{sub 22.5} (Vit1{reg_sign}) and on further alloys, where the ZrTi and CuBe content have been changed, following the tie-line in the direction of Zr{sub 46.8}Ti{sub 8.2}Cu{sub 7.5}Ni{sub 10}Be{sub 27.5} (Vit4{reg_sign}). The SANS data of the samples, preannealed at temperatures between 330 C and 390 C, show interference peaks giving evidence for spatially correlated arrangements of inhomogeneities. The Q values of the interference peaks, Q{sub max}, decrease with increasing annealing temperature T{sub a} and, at a given annealing temperature, with composition following the tie-line from ... continued below

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16 p.

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Johnson, W. L.; Loffler, J. F. & Thiyagarajan, P. July 12, 1999.

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The authors performed small-angle neutron scattering experiments on the bulk amorphous alloy Zr{sub 41.2}Ti{sub 13.8}Cu{sub 12.5}Ni{sub 10}Be{sub 22.5} (Vit1{reg_sign}) and on further alloys, where the ZrTi and CuBe content have been changed, following the tie-line in the direction of Zr{sub 46.8}Ti{sub 8.2}Cu{sub 7.5}Ni{sub 10}Be{sub 27.5} (Vit4{reg_sign}). The SANS data of the samples, preannealed at temperatures between 330 C and 390 C, show interference peaks giving evidence for spatially correlated arrangements of inhomogeneities. The Q values of the interference peaks, Q{sub max}, decrease with increasing annealing temperature T{sub a} and, at a given annealing temperature, with composition following the tie-line from Vit1 to Vit4. They find that, in two distinguished regimes, the data follow a relation 1/L{sup 2} {proportional_to} T{sub a} as predicted by Cahn's theory (L = 2{pi}/Q{sub max} is the wavelength of the decomposition), with a crossover at the glass transition temperature T{sub g} = 350 C. The authors explain the crossover by different diffusion mechanisms below and above T{sub g}.

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16 p.

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OSTI as DE00011887

Medium: P; Size: 16 pages

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  • 11th International Conference on Small-Angle Scattering (SAS '99), Upton, NY (US), 05/17/1999--05/20/1999

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  • Report No.: ANL/IPNS/CP-99464
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 11887
  • Archival Resource Key: ark:/67531/metadc624857

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  • July 12, 1999

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  • June 16, 2015, 7:43 a.m.

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  • April 7, 2017, 3:15 p.m.

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Johnson, W. L.; Loffler, J. F. & Thiyagarajan, P. Decomposition mechanism in supercooled liquid alloys., article, July 12, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc624857/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.