Titanium aluminide (TiAl) alloys exhibit high specific strength, low density, good oxidation, corrosion, and creep resistance at elevated temperatures, making them good candidate materials for aerospace and automotive applications. TiAl alloys also show excellent radiation resistance and low neutron activation, and they can be developed to have various microstructures, allowing different combinations of properties for various extreme environments. Hence, TiAl alloys may be used in advanced nuclear systems as high-temperature structural materials. Moreover, TiAl alloys are good materials to be used for fundamental studies on microstructural effects on irradiation behavior of advanced nuclear structural materials. This article reviews the microstructure, creep, radiation, and oxidation properties of TiAl alloys in comparison with other nuclear structural materials to assess the potential of TiAl alloys as candidate structural materials for future nuclear applications.

Assessment of Titanium Aluminide Alloys for High-Temperature Nuclear Structural Applications

Development of gas–solid direct contact heat exchanger by use of axial flow cyclone

The formation and accumulation of radiation-induced defects and the role of lamellar interfaces in radiation damage of titanium aluminum alloy irradiated with Kr-ions at room temperature

Some components of fusion reactors receive high heat fluxes either during startup and shutdown, or while the machine is in operation. This paper analyzes various ways of enhancing heat transfer using helium and water for cooling these high heat flux components. Conclusions are then drawn to decide on the best choice of a coolant for use in the near term and in the long term.

Comparison of schemes for cooling high heat flux components in fusion reactors

LWlkg respect&ely2"s4., Although contestable, it is the A conceptual. vehicle de&n enabling fast outer solar system travel was produced predicated on a. small aspect ratio sphekical torus nuclear fusion reactor. .Analysis revealed that the vehicle could deliver a 108 mt crew habitat payload to Saturn rendezvous 'in 214 days, with an initial mass in low Earth orbit of 2,640 mt. Engineering conceptual design, analysis, and assessment was performed on all major systems including payload, central truss, nuclear fusion reactor, power, magnetic nozzle, fast wave plasma' heating, tankage, startup/re-start fission reactor and battery, refrigeration, communicationS, reaction control, mission design, and space operations. Detailed fusion reactor design analysis included plasma characteristics, power balance/utilization, first wall, toroidal field coils, and heat transfer. judgment of the a&hors and m&y in the field that only a single space propulsion t&hnology exists at this time. that can reasonably be expected to offer this capability: nuclear fusion, &her magnetic or inertial cotimement. Based in part on the results of previous s&lies2,5 of the ,attributes and shortcomings of various classes of reactor 'towards space propulsion, a closed magnetic syskm was chosen for this design concept. The high power density achievable in closed systems, improved confinement, spin polarization of the fuel, density and temperature profile peaking provided a distinct advantage @ their application towards space propulsion. The small aspect ratio spherical torus was chosen to serve as the basis for the vehicle concept.

Hiroyuki Koike

Papers

Design study of helium-solid suspension cooled blanket and divertor plate for a tokamak power reactor