Microstructural and Mechanical Characterization of Sintered …
413
3 Result and Discussion
3.1 Microstructure Study
Microstructure of samples depends upon the amount of reinforcements and its size.
Figure 1 shows aluminum AA2014 alloy (sample-1), AA2014 with addition of 5 wt%
TiB 2 (sample-2), and AA2014 with 5 wt% TiB 2 and 5 wt% Al 2 O 3 (sample-3). By
deep etching on the surface with Keller’s reagent, shape, size, and grain boundary of
particles were exposed. Porosity of samples was shown as black spot which reduces
mechanical properties. Porosity associated with grain boundary appears to be spherical shape later its change to oblate, these shape formed because of gas originated
within materials [25].
In sample-1, aluminum particles were dispersed randomly in aluminum AA2014
alloy. It is also confirmed that microstructure contains smaller, coarse grain particles of aluminum, copper, chromium, silica and magnesium. From Fig. 1, sample-2
titanium diboride particles were dispersed uniformly in aluminum AA2014 matrix.
TiB 2 particles are naturally hexagonal or typically spherical form clusters at grain
boundaries which reveal that it will facilitate grain refinement and strengthening
effect. Addition of TiB 2 particles in ductile matrix, which enhances diffusivity and
Fig. 1 Microstructure of a sample-1, b sample-2, c sample-3
413
3 Result and Discussion
3.1 Microstructure Study
Microstructure of samples depends upon the amount of reinforcements and its size.
Figure 1 shows aluminum AA2014 alloy (sample-1), AA2014 with addition of 5 wt%
TiB 2 (sample-2), and AA2014 with 5 wt% TiB 2 and 5 wt% Al 2 O 3 (sample-3). By
deep etching on the surface with Keller’s reagent, shape, size, and grain boundary of
particles were exposed. Porosity of samples was shown as black spot which reduces
mechanical properties. Porosity associated with grain boundary appears to be spherical shape later its change to oblate, these shape formed because of gas originated
within materials [25].
In sample-1, aluminum particles were dispersed randomly in aluminum AA2014
alloy. It is also confirmed that microstructure contains smaller, coarse grain particles of aluminum, copper, chromium, silica and magnesium. From Fig. 1, sample-2
titanium diboride particles were dispersed uniformly in aluminum AA2014 matrix.
TiB 2 particles are naturally hexagonal or typically spherical form clusters at grain
boundaries which reveal that it will facilitate grain refinement and strengthening
effect. Addition of TiB 2 particles in ductile matrix, which enhances diffusivity and
Fig. 1 Microstructure of a sample-1, b sample-2, c sample-3