Author： Dryzek Jerzy
Publisher： Springer Publishing Company
ISSN： 1023-8883
Source： Tribology Letters, Vol.40, Iss.1, 2010-10, pp. : 175-180
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Abstract
The report about subsurface zone (SZ) created during dry sliding in pure bismuth is presented. The positron lifetime measurements revealed the well defined subsurface zone where the concentration of created during sliding vacancy clusters decreases exponentially with the depth from the worn surface increases. The experimental results are quite well described by the two state trapping model which allows to determine the positron trapping rate and hence deduce about the depth dependency of vacancy voids concentration. Despite of the low recrystallization temperature ca. 115 °C in this semimetal, determined also by the positron lifetime measurements, no significant effect of temperature rise due to sliding on the SZ constitution is observed.
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