Open AccessStructural evolution and grain growth kinetics of the mechanically alloyed Fe42.5Al42.5Ti5B10 induced by annealing
Author(s) -
Rong Ren,
Yucheng Wu,
Wenming Tang,
Feng-tao Wang,
Zheng Zhi-xiang
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.5774
Subject(s) - materials science , feal , nanocrystalline material , annealing (glass) , grain growth , ball mill , activation energy , kinetics , solid solution , metallurgy , atomic diffusion , grain size , chemical engineering , crystallography , intermetallic , nanotechnology , chemistry , alloy , engineering , physics , quantum mechanics
The XRD and TEM techniques were used to study the structural evolution in the mechanical alloying and annealing of Fe42.5Al42.5Ti5B10. The mechanical alloying mechanism during ball milling and the grain growth mechanism during annealing of the powder are also discussed. The results show that the diffusion of AlTi and B atoms into Fe lattice occurs during millingleading to the formation of Fe(AlTiB) solid solution. The process is controlled by continuous diffusion mixing mechanism. The alloying reaction is completed after 50h and the final product is a powder composed of nanocrystalline Fe(AlTiB). Besides the relaxation of crystal defaults and lattice stressthe decomposition of Fe(AlTiB) occurs to form FeAl and TiB2 during heat treatment of the 50h milled powder. The activation energy for the nanocrystalline FeAl growth was calculated to be 525.6kJ/mol according to kinetics theory of nanocrystalline growth.