X-ray Diffraction Techniques for Structural Determination of Amorphous Materials

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Prevention of corrosion is a vital goal for the Department of Defense when billions of dollars are spent every year. Corrosion resistant materials have applications in all sort of military vehicles, and more importantly in naval vessels and submarines which come in contact with the seawater. An important application of the corrosion resistant material is in the radioactive waste disposable field where the vessels or containers are expected to hold the radioactive toxic materials for thousands of years to surpass the half life of the radiation. It has been known that corrosion resistance can be improved by the used of ... continued below

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Saw, C K; Lian, T; Day, S D & Farmer, J C October 16, 2006.

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Prevention of corrosion is a vital goal for the Department of Defense when billions of dollars are spent every year. Corrosion resistant materials have applications in all sort of military vehicles, and more importantly in naval vessels and submarines which come in contact with the seawater. An important application of the corrosion resistant material is in the radioactive waste disposable field where the vessels or containers are expected to hold the radioactive toxic materials for thousands of years to surpass the half life of the radiation. It has been known that corrosion resistance can be improved by the used of structurally designed materials in the amorphous state where the atoms are arranged in a non-periodic conditions, even though, some local chemical short range ordering may occur in the amorphous arrangement. On the other hand, the final material can also be elementally tailored to specific application. This work documents in details the characterization effort for the amorphous materials using x-ray diffraction technique as part of the High Performance Corrosion-Resistant Material--Structural Amorphous Metal (HPCRM-SAM) program here at LLNL. The samples are in the form of powders, ribbons and coatings deposited onto parts. Some brief theoretical background is given in order to interpret the results, instrumentation will also be described. The results suggest that the formation of amorphous phase in the metal alloys powders greatly depends on the processing conditions. In most of the powders, especially lot No.06, the result indicates that the materials are amorphous with a very small amount of iron boron alloy. In the ribbon samples, all the samples and of different compositions as well are observed to be amorphous. In most cases, starting from an amorphous powder sample, the coatings are also observed to be amorphous with a small amount of iron oxide, probably due to exposure to air during the thermal spraying process.

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PDF-file: 30 pages; size: 0.6 Mbytes

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  • Report No.: UCRL-TR-225388
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/900132 | External Link
  • Office of Scientific & Technical Information Report Number: 900132
  • Archival Resource Key: ark:/67531/metadc889239

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  • October 16, 2006

Added to The UNT Digital Library

  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 9, 2016, 1:08 p.m.

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Saw, C K; Lian, T; Day, S D & Farmer, J C. X-ray Diffraction Techniques for Structural Determination of Amorphous Materials, report, October 16, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc889239/: accessed September 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.