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Nuclear Science User Facilities 56 Robust materials are critical to meet evolving advanced reactor and fuel designs.These mate- rials need to operate in extreme envi- ronments of elevated temperatures corrosive media and high radiation fluences with lifetime expectation of greater than 60 years. Full under- standing of a materials response to irradiation is paramount to long-term reliable service.The layered ternary carbides and nitrides known as MAX phases have the potential to be used in the next-generation nuclear reactors. All MAX phases are fully machinable even though some of them such as Ti3SiC2 andTi2AlC2 are similar to titanium metal in density but are three times as stiff.The thermal and electrical conductivities are high and metal-like.They have relatively high fracture toughness values and some are chemically stable in corrosive environments.They also have shown irradiation damage tolerance in heavy ion studies. The aim of this project is to inves- tigate the damage in Ti3SiC2Ti3AlC2 and chemical vapor deposition CVD SiC for comparison after exposure to a spectrum of neutron irradiations consistent with conditions found in light water nuclear reactors. Advanced Damage-Tolerant Ceramics Candidates for Nuclear Structural Applications Michel W. Barsoum Drexel University barsoumwdrexel.edu Figure 1. a Brightfield TEM images taken near the 0001 zone axis of the ATR-Ti3SiC2 sample irradiated to 0.1 dpa at 100C reveals perturbation of the surface and long basal plane dislocations. The mottled surface was likely due to improper FIB cleaning. b TEM micrograph of ATR-Ti3SiC2 sample irradiated to 0.1 dpa at 500C taken in 2 beam condition near the 11-20 zone axis shows dislocation arrays parallel to the basal plane and stacking faults. Small defects can be seen throughout but were not confirmed as loops. c Brightfield TEM micrograph taken on the 11-20 zone of the ATR-Ti3SiC2 sample irradiated to 0.1 dpa at 1000C showing a preexisting TiC particle that was highly damaged - with dislocation loops and black spots - not present in the surrounding MAX matrix which remains clear of irradiation induced defects.