B. Dogan

Bio: B. Dogan is an academic researcher. The author has contributed to research in topics: Ultimate tensile strength. The author has an hindex of 1, co-authored 1 publications receiving 5 citations.

Microstructural and failure characteristics of metal-lntermetallic layered sheet composites

Abstract: A processing technique for the fabrication of layered metal-intermetallic composites is presented, in which a self-propagating, high-temperature synthesis reaction (SHS) was initiated at the interface between dissimilar elemental metal foils. The resultant composite microstructure consisted of a fully dense, well-bonded metal-intermetallic layered composite. In this United States Bureau of Mines study, metal (Fe, Ni, or Ti) foils were reacted with Al foils to produce metal-metal aluminide layered composites. Tensile tests conducted at room temperature revealed that composites could be designed to behave in a high-strength and high-toughness manner by altering the thicknesses of the starting elemental foils. Failure characteristics revealed that the processes that govern ductilevs brittle behavior of the composites occur early in the fracture.

Synthesis of RuAl by reactive powder processing

Abstract: The unusual combination of high-temperature strength and room-temperature ductility makes compounds based on RuAl attractive for structural applications Difficulties inherent in the manufacture of RuAl by melt processing can be circumvented by powder metallurgical (PM) techniques The present work shows that reactive hot isostatic pressing (RHIPing) based on the self-propagating exothermic reaction of the constituent powders allows homogeneous, high-density material to be made Controlled process parameters include green density, prior degassing, the powder size distribution, heating rate, pressure, and homogenizing schedule The nature of the reaction products was found to be determined primarily by the applied pressure during combustion While concurrent pressure is required to ensure densification, pressurization leads to the formation of a host of nonequilibrium phases that necessitate extended homogenizing practices to drive the reaction to completion The readily assimilable process parameters allow the production of structural components based on RuAl to be envisaged

Gamma titanium aluminide research and applications in Germany and Austria

Abstract: Research and applications of γ-base titanium aluminide alloys in Germany and Austria are reviewed. Special emphasis is given to the results of three major German national materials research projects: (i) gas turbine components, (ii) sheet and foil material, and (iii) automotive components. TiAl turbine blades and valves were successfully tested, and sheets are planned to be used in hypersonic applications. Powder metallurgy methods have been developed as alternative processing routes. Basic investigations on phase diagrams were carried out as a base for alloy development and high-resolution electron microscopic methods have led to a better understanding of the mechanical behaviour.