Influence of Nb and Sn on d Electrons of TiAl Alloys Studied by Coincidence Positron Annihilation Spectroscopy

Abstract:

The coincidence Doppler broadening spectra of single crystals of Si, Al, polycrystals of Ti, Nb and Sn, and TiAl-based alloys (TiAl, Ti₅₀Al₄₈Nb₂ and Ti₅₀Al₄₈Sn₂) have been measured and analyzed. It has been found that the 3d electron signal for binary TiAl alloy is lower than expected due to the Ti 3d-Al 3p interactions. The addition of Nb atoms to TiAl alloy leads to the enhancement of d-d interactions and thus the d electron signal in the spectrum. The d electron signal in the spectrum of Ti₅₀Al₄₈Nb₂ alloy is higher than that of Ti₅₀Al₄₈Sn₂ alloy. The influence of Nb and Sn on d electrons of TiAl alloys has been discussed.

• Periodical: Advanced Materials Research (Volumes 415-417)
• Pages: 1132-1135
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.415-417.1132
• Online since: December 2011
• Authors: Juan Gao, Jing Ying Ye, Wen Chun Zhang, Hui Juan Wang, Wen Deng
• Keywords: D Electrons, Positron Annihilation, TiAl Alloys

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