Figure 3 Shows Experimental Observations Of Grain Refinement In Aluminium By Adding Nano Particles To Liquid Aluminium A 1 (313.04 KiB) Viewed 58 times
Figure 3 Shows Experimental Observations Of Grain Refinement In Aluminium By Adding Nano Particles To Liquid Aluminium A 2 (36.56 KiB) Viewed 58 times
Figure 3 shows experimental observations of grain refinement in aluminium by adding nano particles to liquid aluminium and cooling them to room temperature. Aluminium has a lattice size of 4.05 Å and the nano particles have a cubic lattice of lattice size 4.14 Å. (a) (b) (c) (d) nano particles 5.17 nm uvw-011AI 5 nm 200 200 m 200 um 200 m uvw-100CcB6 Figure 3: (a) Grain size in pure aluminium without the nano particles. (b-c) Grain sizes in aluminium with nano particles. (d) Nano particles embedded in aluminium.
(5 marks) Briefly explain why these nano particles can reduce the grain size? Note: the nanoparticles have much higher melting point than aluminium and remain as solid particle through the entire process.
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