Tensile properties and strengthening effects of 6061Al/12 wt%B4C composites reinforced with nano-Al2O3 particles

Mechanical and microstructural analysis of Al-Al2O3/B4C hybrid composites

“…A uniform dispersion of the particles into the matrix is an effective mechanism for strengthening which involves dislocations bowing/Orowan looping around the hard particles. 16,18 Dispersion of the particles creates loops around particles that leads to decreased mean particles spacing and thereafter restriction to dislocation movement and increase in strength. The incorporation of hard particles (B 4 C and Al 2 O 3 ) into Al matrix acts as a barrier that resists the movement of crack propagation by increasing the dislocation density.…”

“…A similar type of result as an increase in tensile properties by hybridization has already been reported in the past literature. 14,16–18…”

“…The thermal mismatch leads to plastic residual stress resulting in improved dislocation energy causing an increase in strength. 16,18,23…”

“…The tensile strength of 6061Al/12 wt.% B 4 C composites was improved owing to the incorporation of Al 2 O 3 particles that showed a positive effect of hybridization. 16 The Al-based hybrid composites were prepared by stir casting method with varying weight percentages of Al 2 O 3 (3, 6, 9 and 12), constant 1 wt.% of graphite and a higher flexural strength of hybrid composite was reported by Saravanakumar and Sasikumar. 17 Manikandan and Arjunan 18 reported higher mechanical properties of hybrid cow dung ash (CDA)–B 4 C MMC than matrix as well as single reinforced composites.…”

Metallic Additives Dispersed Polymer Composites for Irradiation Shielding- A Novel Critique

“…Gadolinium tops the list by holding a very high neutron absorption cross-section though researches are very limited regarding its application for structural ability. On the other hand cadmium being a traditional poisonous shielding material is reported the inability to be used widely owing to the threat for the health concern of the human workforce mainly during the manufacturing processes [27].It is possible for a radiation source to emit both neutron and gamma radiations and hence it is not necessary to maintain different sources for the emission of these radiations. However based on the application under consideration radiation source is possible to be selected.…”