Effect of aging time and aging temperature on fatigue and fracture behavior of 6063 aluminum alloy under seawater influence

Heat treatment effect on thermo-mechanical fatigue and low cycle fatigue behaviors of A356.0 aluminum alloy

“…These fine particles/clusters will pin dislocations and strengthen the material for under-aged to peak-aged temperatures. As the temperature increases (more than peak-aged temperature which is about 180°C), the fine particles grow and coalesce which leads to reduce their pinning effectiveness, and thereby the strength decreases [9,18,[26][27][28]. Chan et al [26] reported that the dissolution of Mg 2 Si may take place at the temperatures over 300°C and so that the softening of A356.0 alloy and the recovery of the ductility may occur in solution-treated, naturalaged and peak-aged alloys.…”

“…As mentioned in the literature, the ageing parameters (the temperature and the time) were optimized by Siddiqui et al [9] for 6063 aluminum alloy under fatigue loadings. They concluded that the best precipitation hardening temperature is 180°C when 6063 alloy is aged for 9 h and has achieved a maximum fatigue resistance property.…”

“…They showed that although T6 and T7 heat treatments appeared to be highly beneficial for the thermal fatigue performance, but T7 treatment could not improve the material performance more than T6 treatment. The effect of ageing time and temperature on fatigue and fracture behaviors of 6063 aluminum alloy was studied by Siddiqui et al [9] under seawater conditions. They demonstrated that the increase in the fatigue resistance property with ageing time was linked with the vacancies assisted diffusion mechanism and also by the hindering of dislocation movement by impure atoms.…”

Fatigue strength dependence on the ultimate tensile strength and hardness in magnesium alloys

“…The increasing use of magnesium castings in structural applications has drawn considerable interest in their fatigue properties [3,[10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Like many other metal castings, magnesium castings generally demonstrate easy fatigue crack initiation in the presence of casting defects such as gas pores, oxide films and shrinkages at or below the casting surface [11][12][13][14][15][16][17].…”

“…The fatigue life of cast magnesium alloys is determined by the maximum flaw size in the stressed areas [13][14][15][16][17]. In addition to casting defects, the fatigue properties of cast magnesium alloys also depend on microstructure constituents including grain size, second-phase particles, solid solution matrix and precipitates, which are determined by alloy composition, casting and heat treatment conditions [18][19][20][21][22][23]. As an example, the effects of Zr (for grain refinement) and Nd addition (for solution strengthening or precipitation strengthening) as well as heat treatment conditions (T4-and T6-treated conditions) on the tensile and high cycle fatigue strengths of the Mg-3Nd-0.2Z n-xZr (abbrev.…”