204
M. S. Dani and I. B. Dave
Fig. 14 Optical and SEM micrographs of 380 rpm DP with aluminum powder
Fig. 15 Optical and SEM micrographs of 545 rpm DP with aluminum powder
0
2
4
6
8
10
12
14
Die Cast AZ91
Mg alloy
AZ91 FSP 380
SP without Al
AZ91 FSP 545
SP without Al
AZ91 FSP 380
DP without Al
AZ91 FSP 545
DP without Al
Grain size No
Grain Size Measurment
Fig. 16 Comparison of grain size number of FSPed AZ91 Mg alloy without aluminum powder SP
and DP with 380 and 545 rpm with untreated die-cast AZ91 Mg alloy
Thus, due to FSP, refining of grains can be observed by microstructures analysis.
In stir zone of FSP region, more refinement of grains observed because of dynamic
recrystallization which is a specific feature of FSP has been referred and reported by
so many authors [10–15].
M. S. Dani and I. B. Dave
Fig. 14 Optical and SEM micrographs of 380 rpm DP with aluminum powder
Fig. 15 Optical and SEM micrographs of 545 rpm DP with aluminum powder
0
2
4
6
8
10
12
14
Die Cast AZ91
Mg alloy
AZ91 FSP 380
SP without Al
AZ91 FSP 545
SP without Al
AZ91 FSP 380
DP without Al
AZ91 FSP 545
DP without Al
Grain size No
Grain Size Measurment
Fig. 16 Comparison of grain size number of FSPed AZ91 Mg alloy without aluminum powder SP
and DP with 380 and 545 rpm with untreated die-cast AZ91 Mg alloy
Thus, due to FSP, refining of grains can be observed by microstructures analysis.
In stir zone of FSP region, more refinement of grains observed because of dynamic
recrystallization which is a specific feature of FSP has been referred and reported by
so many authors [10–15].