Kinetic study of static recrystallization in an Fe–Al–O ultra-fine-grained nanocomposite

0482161 - ÚFM 2018 RIV GB eng J - Journal Article
Bártková, Denisa - Šmíd, Miroslav - Mašek, B. - Svoboda, Jiří - Šiška, Filip
Kinetic study of static recrystallization in an Fe–Al–O ultra-fine-grained nanocomposite.
Philosophical Magazine Letters. Roč. 97, č. 10 (2017), s. 379-385. ISSN 0950-0839. E-ISSN 1362-3036
R&D Projects: GA ČR GJ15-21292Y; GA MŠMT LM2015069
Institutional support: RVO:68081723
Keywords : recrystallization * dislocation structures * nanoscale precipitates * microstructure * abrupt grain coarsening
OECD category: Audio engineering, reliability analysis
Impact factor: 1.194, year: 2017

A nearly abrupt coarsening of grains is observed in a newly developed Fe–Al–O ultra-fine-grained nanocomposite with a significant volume fraction (4%) of alumina nano-precipitates. The microstructure of the alloy was analysed in different states (as-received and annealed) by means of scanning electron microscopy, transmission electron microscopy (TEM) and hardness. The initial grain size 150–200 nm increases up to 50 micrometers during annealing 1000 °C/8 h and thereafter demonstrates saturation. A linear correlation between volume fraction of coarse grains and hardness was found. It was identified by TEM that alumina nano-precipitates stabilize the dislocation microstructure against recovery very effectively and the grain coarsening is due to fast growth of very few dislocation free grains. Thus, the observed grain coarsening has the attributes of static recrystallization.
Permanent Link: http://hdl.handle.net/11104/0277707