A non-contaminating method for preparing intra-rare-earth alloys containing volatile and non-volatile metals [electronic resource].
- Washington, D.C. : United States. Dept. of Energy, 1991.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- Pages: (5 pages) : digital, PDF file
- Additional Creators:
- Ames Laboratory
United States. Department of Energy
United States. Department of Energy. Office of Scientific and Technical Information
- The preparation of alloys containing one to two percent of the volatile lanthanide metals Sm, Eu, Tm and Yb in the high melting point (HMP) rare earth metals Sc, Y and Lu was accomplished by a vapor deposition, diffusion method without crucible contamination. The method avoids the melting of the HMP metals which would introduce impurities from the crucible generally Ta or W. Plates of the HMP metals were hung from the lid in the upper part of the Ta crucible. The volatile metals were placed on the bottom and the lid welded in place under an atmosphere of helium. By proper selection of the alloying temperature, the effusion of the metal vapors through the helium atmosphere was slow enough to permit diffusion to occur and prevent refluxing of the newly formed alloy. Very volatile metals such as Mg required a Knudsen cells with a suitably size hole to prevent too rapid transfer of the low melting metal. Electron microprobe analysis of a cross-section of the HMP metals showed a homogeneous distribution of the volatile metals. The time and temperature required to obtain a homogeneous rare earth alloy without contamination are given. The use of the Knudsen cell to form magnesium-rare earth alloys is reviewed. 8 refs., 2 tabs.
- Published through SciTech Connect.
Minerals, Metals, and Materials Society (TMS) annual meeting and exhibition, San Diego, CA (United States), 1-5 Mar 1992.
Laabs, F.C.; Beaudry, B.J.
- Funding Information:
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