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Materials 2017, 10(12), 1343; doi:10.3390/ma10121343

Positron Annihilation and Complementary Studies of Copper Sandblasted with Alumina Particles at Different Pressures

1
Institute of Nuclear Physics Polish Academy of Sciences, PL-31342 Krakow, Poland
2
Joint Institute for Nuclear Research, 6 Joliot Curie Str., 141980 Dubna, Russia
3
Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, 30 Mickiewicza Ave., 90-059 Krakow, Poland
*
Author to whom correspondence should be addressed.
Received: 6 October 2017 / Revised: 5 November 2017 / Accepted: 20 November 2017 / Published: 23 November 2017
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

Positron annihilation spectroscopy and complementary methods were used to detect changes induced by sandblasting of alumina particles at different pressures varying from 1 to 6 bar in pure well-annealed copper. The positron lifetime measurements revealed existence of dislocations and vacancy clusters in the adjoined surface layer. The presence of retained alumina particles in the copper at the depth below 50 µm was found in the SEM pictures and also in the annihilation line shape parameter profiles measured in the etching experiment. The profiles show us that the total depth of damaged zones induced by sandblasting of alumina particles ranges from 140 µm up to ca. 800 µm and it depends on the applied pressure. The work-hardening of the adjoined surface layer was found in the microhardness measurements at the cross-section of the sandblasted samples. View Full-Text
Keywords: defects; copper; sandblasting; positron spectroscopy defects; copper; sandblasting; positron spectroscopy
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Horodek, P.; Siemek, K.; Dryzek, J.; Wróbel, M. Positron Annihilation and Complementary Studies of Copper Sandblasted with Alumina Particles at Different Pressures. Materials 2017, 10, 1343.

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