DEVELOPMENT OF HIGH-STRENGTH TERNARY AND QUATERNARY THORIUM-URANIUM BASE ALLOYS. Final Report

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The addition of alloying elements to base alloys of Th containing 5 and 10 wt% U was investigated with regard to alloy structures and elevated- temperature mechanical properties. The alloys developed possess elevatedtemperature tensile and stress-rupture strengths of essentially twice those associated with binary Th-5 and 10 wt% U alloys at 60O to 800 deg C. The greater strength of these alloys should resuit in improved resistance to radiationinduced swelling at high temperatures. Noticeable improvement in elevated-temperature mechanical properties resulted from the addition of 2 and 5 wt% Zr to the Th-5 and Th-10 wt% U base alloys. Zr was ... continued below

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Pages: 157

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Cole, R.H. & Wilkinson, L.E. November 1, 1961.

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  • Advanced Technology Laboratories
    Publisher Info: Advanced Technology Labs., Div. of American-Standard, Mountain View, Calif.
    Place of Publication: Mountain View, California

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Description

The addition of alloying elements to base alloys of Th containing 5 and 10 wt% U was investigated with regard to alloy structures and elevated- temperature mechanical properties. The alloys developed possess elevatedtemperature tensile and stress-rupture strengths of essentially twice those associated with binary Th-5 and 10 wt% U alloys at 60O to 800 deg C. The greater strength of these alloys should resuit in improved resistance to radiationinduced swelling at high temperatures. Noticeable improvement in elevated-temperature mechanical properties resulted from the addition of 2 and 5 wt% Zr to the Th-5 and Th-10 wt% U base alloys. Zr was found to be the most effective additive in improving elevated-temperature mechanical properties, although significant improvement was noted with additions of Nb, Mo, C, Al, and Be. Both solidsolution strengthening and dispersion strengthening of the Th --U base alloys were encountered. It was found that a fine intragranular distribution of the secondary U phase improved the mechanical properties of the alloys studied. Structures with optimum properties were produced by careful control of the arc-melting procedure and by solution heat treating at 1350 deg C followed by aging at 850 deg C. Preliminary testing was performed to determine the elevatedtemperature mechanical properties of Th metal and of the Th --U base alloys. Irradiation specimens of the most promising alloys were prepared. These specimens were encapsulated and are ready for irradiation testing at 800 deg C and for subjection to burnups of 10,000, 20,000 and 30,000 Mwd/ ton. (auth)

Physical Description

Pages: 157

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  • Other Information: Includes appendices: A. TENSILE TESTING RESULTS. B. STRESS-RUPTURE TESTING RESULTS. Orig. Receipt Date: 31-DEC-63

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  • Report No.: ATL-A-128
  • Grant Number: AT(04-3)-250
  • DOI: 10.2172/4758522 | External Link
  • Office of Scientific & Technical Information Report Number: 4758522
  • Archival Resource Key: ark:/67531/metadc1028493

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  • November 1, 1961

Added to The UNT Digital Library

  • Oct. 18, 2017, 7:39 a.m.

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  • Jan. 12, 2018, 4:13 p.m.

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Cole, R.H. & Wilkinson, L.E. DEVELOPMENT OF HIGH-STRENGTH TERNARY AND QUATERNARY THORIUM-URANIUM BASE ALLOYS. Final Report, report, November 1, 1961; Mountain View, California. (digital.library.unt.edu/ark:/67531/metadc1028493/: accessed June 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.