Accession Number : ADA118946

Title :   Mechanisms of Ductility and Fracture in High-Temperature Materials.

Descriptive Note : Final technical rept. 3 Apr 78-1 Aug 81,

Corporate Author : SYSTEMS RESEARCH LABS INC DAYTON OH

Personal Author(s) : Mendiratta,M G ; Mah,Tai-Il ; Chattergee,D K

PDF Url : ADA118946

Report Date : Jun 1982

Pagination or Media Count : 94

Abstract : Significant improvements in the performance of current gas-turbine engines are possible through the use of higher operating temperatures and lower-density structural materials. Currently used alloys based upon titanium, iron, nickel, and cobalt are rapidly approaching their developmental limit in terms of achieving increased temperature capabilities; therefore, efforts have been made to develop new classes of materials. The dual objective of higher operating temperatures and lower-density materials has prompted research efforts toward the development of ceramics and intermetallics, many of which exhibit low density, high strength, and inertness up to high temperatures. One of the major problems with these materials is the lack of adequate room-temperature ductility and fracture toughness. The overall approach to these investigations was to gain an understanding of the mechanisms for the brittle/ductile (B/D) transition and toughening and to explore the possbility that by process control and/or alloying, either the B/D transition temperature could be lowered or the toughness increased.

Descriptors :   *REFRACTORY MATERIALS, *CERAMIC MATERIALS, *COMPOSITE MATERIALS, *GAS TURBINES, TITANIUM COMPOUNDS, CARBIDES, ALUMINIDES, ALUMINUM COMPOUNDS, SILICATES, FABRICATION, MICROSTRUCTURE, MECHANICAL PROPERTIES, DUCTILE BRITTLE TRANSITION

Subject Categories : Ceramics, Refractories and Glass
      Laminates and Composite Materials
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE