Positron annihilation spectroscopy of vacancy-type defects hierarchy in submicrocrystalline nickel during annealing

Journal Article · Fri Nov 14 00:00:00 EST 2014 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4901488· OSTI ID:22390418

Kuznetsov, Pavel V., E-mail: [e-mail] ^[1]; Mironov, Yuri P., E-mail: [e-mail], E-mail: [e-mail], E-mail: [e-mail]; Tolmachev, Aleksey I., E-mail: [e-mail], E-mail: [e-mail], E-mail: [e-mail]; Rakhmatulina, Tanzilya V., E-mail: [e-mail], E-mail: [e-mail], E-mail: [e-mail] ^[2]; Bordulev, Yuri S., E-mail: [e-mail], E-mail: [e-mail], E-mail: [e-mail]; Laptev, Roman S., E-mail: [e-mail], E-mail: [e-mail], E-mail: [e-mail]; Lider, Andrey M., E-mail: [e-mail], E-mail: [e-mail], E-mail: [e-mail]; Mikhailov, Andrey A., E-mail: [e-mail], E-mail: [e-mail], E-mail: [e-mail] ^[3]; Korznikov, Alexander V., E-mail: [e-mail] ^[4]

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1. Institute of Strength Physics and Materials Science SB RAS, Tomsk, 634055, Russia and National Research Tomsk Polytechnic University, Tomsk, 634050 (Russian Federation)
2. Institute of Strength Physics and Materials Science SB RAS, Tomsk, 634055 (Russian Federation)
3. National Research Tomsk Polytechnic University, Tomsk, 634050 (Russian Federation)
4. Institute for Metals Superplasticity Problems RAS, Ufa, 450001 (Russian Federation)

Positron annihilation and X-ray diffraction analysis have been used to study submicrocrystalline nickel samples prepared by equal channel angular pressing. In the as-prepared samples the positrons are trapped at dislocation-type defects and in vacancy clusters that can include up to 5 vacancies. The study has revealed that the main positron trap centers at the annealing temperature of ΔT= 20°C-180°C are low-angle boundaries enriched by impurities. At ΔT = 180°C-360°C, the trap centers are low-angle boundaries providing the grain growth due to recrystallization in-situ.

• OSTI ID: 22390418
• Journal Information: AIP Conference Proceedings, Vol. 1623, Issue 1; Conference: International Conference on Physical Mesomechanics of Multilevel Systems 2014, Tomsk (Russian Federation), 3-5 Sep 2014; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANNEALING
ANNIHILATION
DISLOCATIONS
GRAIN GROWTH
NICKEL
POSITRONS
PRESSING
RECRYSTALLIZATION
SPECTROSCOPY
TRAPPING
TRAPS
VACANCIES
X-RAY DIFFRACTION