The effect of A5TB refiner on the fatigue strength of 6063AL alloy

The study focuses on the influence of aluminium titanium boron (A5TB) master alloy on the fatigue behaviour of 6063Al alloy. Cylindrical cast rods of 6063Al alloy containing different proportions of A5TB ranging from 0 - 0.11 wt.% were produced and were machined to conform to a standard fatigue specimen. The test specimens prepared were tested for fatigue strength at various stress levels, and results obtained were compared. The resistance to fatigue failure was observed to decrease as the stress level increased. It was also noted that irrespective of stress level, the optimum fatigue strength was obtained when the A5TB content was about 0.06 wt.%. It was found that 6063Al alloy to which A5TB master alloy have been added was most suitable for the design of components meant to operate under cyclic loading at low stresses below about 3.02 kN/m2.Keywords: Refiner, Fatigue, Aluminium Alloy, Cyclic Loading, Stress levelJournal of Applied Science, Engineering and Technology, Volume 1

High-velocity deformation of Al0.3CoCrFeNi high-entropy alloy: Remarkable resistance to shear failure

The mechanical behavior of a single phase (fcc) Al(0.3)CoCrFeNi high-entropy alloy (HEA) was studied in the low and high strain-rate regimes. The combination of multiple strengthening mechanisms such as solid solution hardening, forest dislocation hardening, as well as mechanical twinning leads to a high work hardening rate, which is significantly larger than that for Al and is retained in the dynamic regime. The resistance to shear localization was studied by dynamically-loading hat-shaped specimens to induce forced shear localization. However, no adiabatic shear band could be observed. It is therefore proposed that the excellent strain hardening ability gives rise to remarkable resistance to shear localization, which makes this material an excellent candidate for penetration protection applications such as armors