Abstract
We report that the 3d electron signal for the transition metals (Cr, Co, and Ni) and the NiAl-based alloys (NiAl, Ni 48Al 45Cr 7, and Ni 48Al 45Co 7) can be extracted by a two-detector coincidence system from the Doppler broadening of positron annihilation radiation. The experimental results show that the 3d electron signal for the undoped NiAl alloy is relatively low. The additions of Cr and Co to NiAl alloy lead to an increase in the probability of positron annihilation with 3d electrons. The 3d electron signal in the spectrum of Ni 48Al 45Co 7 alloy is higher than that of Ni 48Al 45Cr 7 alloy. The Co addition is more effective in enhancing the d–d interactions in NiAl alloy as compared with the Cr addition.
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