Effect of Mechanical Activation on the In Situ Formation of TiB2 Particulates in the Powder Mixture of TiH2 and FeB

The in situ formation of TiB particulates via an interface reaction between Ti and FeB powders was studied. The effects of mechanical activation by high-energy milling on the decomposition of TiH and the interface reactions between Ti and FeB powders to form TiB were investigated. Powder mixtures we...

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Bibliographic Details
Published in:Archives of metallurgy and materials 2017-06, Vol.62 (2), p.1393-1398
Main Authors: Huynh, X.-K., Kim, B.-W., Kim, J.S.
Format: Article
Language:English
Subjects:
Activation analysis
Activation energy
Ball milling
Decomposition reactions
Dispersion
Energy consumption
Energy measurement
Fe-matrix
in situ formation
Interface reactions
mechanical activation
Mechanical alloying
Microstructure
particulate
Particulates
Power consumption
Size reduction
specific ball-milling energy
TiB
TiB2 particulate
Titanium diboride
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Summary:The in situ formation of TiB particulates via an interface reaction between Ti and FeB powders was studied. The effects of mechanical activation by high-energy milling on the decomposition of TiH and the interface reactions between Ti and FeB powders to form TiB were investigated. Powder mixtures were fabricated using planetary ball-milling under various milling conditions. The specific ball-milling energy was calculated from the measured electrical power consumption during milling process. High specific milling energy (152.6 kJ/g) resulted in a size reduction and homogeneous dispersion of constituent powders. This resulted in a decrease in the decomposition temperature of TiH and an increase in the formation reaction of TiB particulates in the Fe matrix, resulting in a homogeneous microstructure of nanoscale TiB evenly distributed within the Fe matrix. In contrast, the powder mixture milled with low specific milling energy (36.5 kJ/g) showed an inhomogeneous microstructure composed of relatively large Fe-Fe B particles surrounded by a thin layer of Fe-TiB within a finely dispersed Fe-TiB matrix region.
ISSN:2300-1909
1733-3490
2300-1909
DOI:10.1515/amm-2017-0215