Microstructure, mechanical response and fractography of AZ91E/Al2O3 (p) nano composite fabricated by semi solid stir casting method

Influence of ultrasonication power on grain refinement, mechanical properties and wear behaviour of AZ91D/nano-Al2O3 composites

“…At higher UST power, the hard reinforcement particles distributed uniformly which increased the capacity of composites for load-bearing. Also, nano-sized hard reinforcement particles restrict matrix deformation by limiting the dislocation movements [25,37]. Besides, the heterogeneous nucleation and grain refinement due to the presence of fine nanoparticles (25 nm) contributed to the improvement in hardness [28].…”

“…From figure 8(b), a slight increase in the % of elongation from 2.4 to 2.7 with respect to increase in UST power is evident. This can be attributed to the obstruction to the formation of fracture by nanoparticles while applying the tensile load [25]. Uniformly distributed nano alumina particles reduced the stress concentration in UST assisted composites compared to the untreated composite.…”

“…Sameer Kumar et al studied the effects of the addition of different wt% of n-Al 2 O 3 particles in AZ91E alloy through use of the semi-solid stir casting method. The study revealed an increase in macro hardness and tensile strength of the composite up to 22.5% and 26.54% respectively compared to base alloy [25]. Xinbao Liu et al and Deming Gao et al examined the microstructure and mechanical properties of UST assisted AZ91 alloy.…”

Optimization of dry sliding wear properties ofAZ91E/ nano Al2O3 reinforced metal matrix composite with grey relational analysis

“…The casting methodology and the basic characterisation was reported in the earlier work (Sameerkumar et al, 2016;Tarasasanka et al, 2016). To determine the wear behaviour of the proposed composite,i.e design of experiments methodology is used in the present study.…”

“…mechanical properties (Yao et al, 2010;Girish et al, 2015). It has been observed that the addition of Al 2 O 3 to AZ91E matrix by semi solid stir casting method yielded improved properties than monolithic material, still the wear behaviour is an issue in overall product development (Sameerkumar et al, 2016). It is observed that more purposeful factors on mechanical as well as wear properties of composites are brought forth when reinforced with the same quantity of nano sized particles than micron ranged particles (Lim et al, 2005;Cao et al, 2008).…”