288
G. Dharmalingam et al.
Fig. 1 Vacuum hot pressing
machine
3 Results and Discussion
3.1 Powder Discriminating of XRD Pattern with Different
Milling Time Intervals
XRD patterns of the aluminium-free (alloy A) and aluminium-containing ferritic
ODS steels (alloy B) are shown in Figs. 2 and 3 respectively. XRD pattern of alloy A
and B has the complete ferrite peaks for un-milled powders (0 h milled powder) sharp
peaks were observed. XRD patterns clearly revealed that milling time influences the
peak broadening with irrespective of compositions of both alloy A, alloy B longer
milling time (20 h) has driven more broadening of peaks, which indicates that nano
crystallite size of the composition was attained and broadening of α-Fe peak is shown
more clearly in 20 h of milling.
Intensity peak was decreased with increases milling time, at 20 h of milled powder
showed almost a flat peak was observed. A solid solution (alloying) formation was
follows Hume-Rothery rules which point out the parameters like atomic size, valance,
and electronegativity of elements on alloying. The electronic interactions of the solute
Fig. 2 XRD analysis of
milled powder alloy A
G. Dharmalingam et al.
Fig. 1 Vacuum hot pressing
machine
3 Results and Discussion
3.1 Powder Discriminating of XRD Pattern with Different
Milling Time Intervals
XRD patterns of the aluminium-free (alloy A) and aluminium-containing ferritic
ODS steels (alloy B) are shown in Figs. 2 and 3 respectively. XRD pattern of alloy A
and B has the complete ferrite peaks for un-milled powders (0 h milled powder) sharp
peaks were observed. XRD patterns clearly revealed that milling time influences the
peak broadening with irrespective of compositions of both alloy A, alloy B longer
milling time (20 h) has driven more broadening of peaks, which indicates that nano
crystallite size of the composition was attained and broadening of α-Fe peak is shown
more clearly in 20 h of milling.
Intensity peak was decreased with increases milling time, at 20 h of milled powder
showed almost a flat peak was observed. A solid solution (alloying) formation was
follows Hume-Rothery rules which point out the parameters like atomic size, valance,
and electronegativity of elements on alloying. The electronic interactions of the solute
Fig. 2 XRD analysis of
milled powder alloy A