Positron beam studies on the irradiation response of FeCrCoNi upon He ion implantation

•Formation and growth of helium bubbles in FeCrCoNi studied using positron beam based Doppler broadening spectroscopy.•Positron lifetime and electron momentum distribution calculations in FeCrCoNi containing Hem-Vn complexes using MIKA code.•Positron beam results point out to higher bubble growth re...

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Bibliographic Details
Published in:Journal of alloys and compounds 2022-03, Vol.898, p.162776, Article 162776
Main Authors: Abhaya, S., Rajaraman, R., David, C.
Format: Article
Language:English
Subjects:
Annealing
Helium bubbles
Helium ions
High entropy alloys
Implantation induced defects
Ion implantation
Nickel
Nucleation
Parameter sensitivity
Positron beam
Positron beams
Rupture
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Summary:•Formation and growth of helium bubbles in FeCrCoNi studied using positron beam based Doppler broadening spectroscopy.•Positron lifetime and electron momentum distribution calculations in FeCrCoNi containing Hem-Vn complexes using MIKA code.•Positron beam results point out to higher bubble growth resistance in FeCrCoNi when compared to nickel. Positron beam-based Doppler broadening results on He ion-implanted FeCrCoNi show distinct changes in defect-sensitive S-parameter corresponding to the formation of helium-vacancy complexes, nucleation/ growth of helium bubbles, and finally the helium bubble rupture, with isochronal annealing. Data analyses of the positron beam-based ratio curves provide clear information on the kinetics of bubble growth and rupture. The difference data in S-parameter (ΔS), which corresponds to the bubble growth, displays a maximum at 1123 K, with annealing temperature. Comparing the ΔS value to that reported for nickel, it is concluded that FeCrCoNi has higher bubble growth resistance than nickel.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2021.162776