Damage accumulation and recovery in C+-irradiated Ti3SiC2

Irradiation-induced structural transitions in Ti 2 AlC

“…3 shows the XRD patterns of the virgin sample and the samples irradiated with Au + ions at room temperature at different fluences ranging from 1 Â 10 14 to 2 Â 10 16 cm À2 . Similar to the structural changes obtained in Ti 3 AC 2 (A = Al/Si) [8,10,11,24], the intensity and the width of the diffraction peaks in the Ti 2 AlC XRD patterns change significantly after irradiation. As the fluence increases, the intensities of the original (1 0 0), (1 0 1), (1 1 0) and (0 0 6) peaks decrease with the width broadening until the peaks disappear at the highest fluence (only very weak signal of (0 0 6) peak left), which reveals the lattice distortion due to various defects and the lattice microstrain induced by irradiation.…”

“…3, 5 and 6, XRD and TEM results show an obvious phase transformation from the original hcp structure to an fcc structure with twinned sequences of ABCABC and CBACBA along ½1 1 1 orientation at 1 Â 10 16 cm À2 , which was also observed in Ti 3 SiC 2 [8,9]. Fig.…”

“…M n + 1 AX n phases (n = 2), especially Ti 3 AlC 2 and Ti 3 SiC 2 , as two typical MAX phases, have been frequently used to investigate the performance under ion irradiation [7][8][9][10][11][12][13][14][15][16]. Similar to Ti 3 AC 2 (A = Al/Si), Ti 2 AlC phase has an isomorphous hexagonal-closepacked structure whose space group is P6 3 /mmc (No.…”

Roles of silicon-layer in Ti3SiC2 materials response to helium irradiation: New insights from first-principles calculation

“…Recently, MAX phases were proposed as candidates in advanced nuclear reactors [14,15] with particular potential applications as fuel coating or cladding material for future fission reactors [16,17]. Several studies have evaluated the irradiation tolerance of MAX phases under high-energy ion irradiation [17][18][19][20]. The studies revealed that Ti 3 SiC 2 exhibits high tolerance to amorphization caused by exposure to ion irradiation [15,[18][19][20][21], which is most likely due to the relatively high displacement energy required to remove atoms from their sites in the first place and to the recrystallisation observed at high temperature [20].…”

“…Several studies have evaluated the irradiation tolerance of MAX phases under high-energy ion irradiation [17][18][19][20]. The studies revealed that Ti 3 SiC 2 exhibits high tolerance to amorphization caused by exposure to ion irradiation [15,[18][19][20][21], which is most likely due to the relatively high displacement energy required to remove atoms from their sites in the first place and to the recrystallisation observed at high temperature [20]. These studies were primarily focused on the displacement damage caused by the collision cascade arising from the projectiles' kinetic energy and the subsequent structural damage caused by the diffusion of defects leading to nucleation to voids or interstitial planes.…”