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Acta Metall Sin  2007, Vol. 43 Issue (3): 269-272     DOI:
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STUDIES OF Nb–TiAl ALLOY BY POSITRON ANNIHILATION TECHNIQUES
ZHANG Lanzhi; WANG Baoyi;WANG Danni; WEI Long; LIN Junpin;WANG Wenjun
Key Laboratory of Nuclear Analysis Techniques; Institute of High Energy Physics; Chinese Academy of Sciences; Beijing 100049
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ZHANG Lanzhi; WANG Baoyi; WANG Danni; WEI Long; LIN Junpin; WANG Wenjun. STUDIES OF Nb–TiAl ALLOY BY POSITRON ANNIHILATION TECHNIQUES. Acta Metall Sin, 2007, 43(3): 269-272 .

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Abstract  Positron annihilation lifetime and coincidence Doppler broadening measurements have been performed in Ti51Al49 alloy with different amounts of Nb doped. The experimental results indicate that when a low mount of Nb atoms is added into Ti51Al49 alloy, the Nb atoms mainly aggregate at grain boundaries, and then the free electron density increases, which reduces the brittleness of TiAl alloys. In contrast, the density of free electron in grain boundaries and in bulk are both decrease in high Nb doped alloy, due to the formation of the new order structure, which increases the brittleness of TiAl alloys.
Key words:  positron annihilation lifetime      coincidence Doppler broadening      
Received:  10 August 2006     
ZTFLH:  TG146.2  

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https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2007/V43/I3/269

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