Quenched-in vacancies and hardening of Fe-Al intermetallics

0541075 - ÚFP 2021 RIV PL eng J - Journal Article
Prochazka, I. - Vlasák, T. - Čízek, J. - Lukáč, František - Liedke, M. O. - Anwand, W. - Jirásková, Y. - Janičkovič, D.
Quenched-in vacancies and hardening of Fe-Al intermetallics.
Acta Physica Polonica A. Roč. 137, č. 2 (2020), s. 255-259. ISSN 0587-4246. E-ISSN 1898-794X
Institutional support: RVO:61389021
Keywords : Fe-Al Intermetallics * Hardening * Quenched-in Vacancies
OECD category: Materials engineering
Impact factor: 0.577, year: 2020
Method of publishing: Open access
http://przyrbwn.icm.edu.pl/APP/PDF/137/app137z2p41.pdf

The role of vacancies in hardening of Fe-Al intermetallic alloys were studied in the present work for a wide range of Al concentrations from 20 to 50 at%. The alloys quenched from 1000 °C as well as those annealed subsequently at 520 °C for 1 h were subject to study. Slow-positron beam experiments combined with Vicker's microhardness tests were utilised. Hardness of Fe-Al alloys exhibited a somewhat complex dependence on Al content which could not be fully explained purely by consideration of intermetallic phases formed. This happens due to additional hardening effect caused by quenched-in vacancies. The concentrations of vacancies were estimated from positron back-diffusion data and found to rise for Al content above 25 at%. Correlation of vacancy concentrations with hardness data for the quenched and annealed alloys has revealed that hardening of alloys with a low Al content (< 30 at%) is originated predominantly by anti-phase boundaries while hardening induced by quenched-in vacancies dominates for alloys with a higher Al content (30-50 at%).
Permanent Link: http://hdl.handle.net/11104/0318655