A positron investigation of electron-irradiation induced defects in γ-TiAl intermetallic compounds

In situ creep under helium implantation of titanium–aluminium alloy

“…Investigations on irradiation effects in c-TiAl based alloys have been carried out [5][6][7][8][9][10][11], mainly focusing on microstructural changes after Heimplantation [6], e À -irradiation [7,8], n-irradiation [9], and heavy ion irradiation [10,11]. But only few data exist on mechanical properties of irradiated cTiAl alloys.…”

Configuration and the recovery of defects in TiAl intermetallic compounds studied by positron annihilation

“…Table 1 lists the analysis of PAL spectra consisting of two positron lifetime components. The first component, s 1 , of three samples approximates the reported lifetime of 150 AE 5 ps in perfect lattice [6,13,14], and represents the annihilation in bulk alloys. The second component, s 2 , of the three alloys was much larger than the lifetime of 230 ps for annihilation in a single-vacancy [6], indicating positrons trapped by some grain boundaries [15] or both boundaries and vacancies.…”