Accession Number : ADA320473

Title :   Processing and Properties of Tough Silicides.

Descriptive Note : Rept. for 15 Jan 93-15 Mar 96,

Corporate Author : CASE WESTERN RESERVE UNIV CLEVELAND OH

Personal Author(s) : Lewandowski, John J. ; Aikin, Robert M., Jr

PDF Url : ADA320473

Report Date : MAY 1996

Pagination or Media Count : 62

Abstract : The processing and properties of tough silicides have been investigated. Vacuum hot pressing was utilized to produce Nb5Si3/Nb laminates, while the fracture toughness of the laminates was evaluated with the use of a deformation stage situated inside of a SEM. The interface strength in such laminates was systematically varied as was the thickness of the Nb layer in order to determine the effects of such changes on the fracture behavior and toughness of such laminates. The effects of changes in test temperature on the above were also determined. Complementary experiments were conducted on in-situ composites where R-curve behavior was obtained. In addition, the effects of changes in grain size, test temperature, and alloy content, on the cleavage fracture stress and the fracture toughness were determined. The results of these experiments were used to rationalize the fracture behavior of the laminates and in-situ composites.

Descriptors :   *HOT PRESSING, *SILICIDES, *NIOBIUM COMPOUNDS, TEST AND EVALUATION, STRESSES, TEMPERATURE, THICKNESS, INTERFACES, COMPOSITE MATERIALS, LAMINATES, DEFORMATION, VACUUM, TOUGHNESS, GRAIN SIZE, ALLOYS, FRACTURE(MECHANICS), CLEAVAGE, INTERMETALLIC COMPOUNDS.

Subject Categories : Inorganic Chemistry
      Laminates and Composite Materials
      Properties of Metals and Alloys
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE