https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:26983 15 ions cm⁻². The evolution of microstructure and induced defects of the irradiated sample with different doses was surveyed by combining grazing incident X-ray diffraction (GIXRD) using synchrotron radiation and variable energy positron beam analysis (PBA). With increasing irradiation dose, the crystallinity degrades gradually and leads to a combination of damaged Ti₃SiC₂ in combination with the precipitation of a TiCₓ phase. For high dose irradiation, a nano-dispersed TiCₓ phase becomes the dominant component. The PBA measurements indicate the formation of a new large vacancy-type defect that could be a cluster or void. The combination of GIXRD and PBA demonstrates that the damage of the MAX phase is more serious in the first 10 nm surface layer than that in the deeper layers closer to the final resting position of the projectile in the solid. The possible damage mechanisms have been discussed.]]> Sat 24 Mar 2018 07:26:59 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:22842 x. Irradiation at 200°C results in maximum microstrain, a maximum in the c lattice parameter, and the appearance of a ß phase in addition to the normal a phase of Ti₃SiC₂. A minimum in the observed damage level near the surface was seen for irradiation at a sample temperature of 300°C but the damaged phase increases at higher temperatures. Differences between the present work and a previous C irradiation study have been ascribed to the enhanced Si defect transport at low temperatures.]]> Sat 24 Mar 2018 07:16:07 AEDT ]]>