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Effect of frequency on fatigue crack growth behavior of magnesium alloy AZ61 under immersed 3.5 mass% NaCl environment

Effect of frequency on fatigue crack growth behavior of magnesium alloy AZ61 under immersed 3.5 mass% NaCl environment,10.1016/j.msea.2010.12.048,Mate

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Effect of frequency on fatigue crack growth behavior of magnesium alloy AZ61 under immersed 3.5 mass% NaCl environment   (Citations: 1)
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Fatigue crack growth test of AZ61 magnesium alloy was carried out under immersed NaCl environment at frequencies of 15, 5 and 0.5Hz under a stress ratio of 0.1. In order to investigate the effect of frequency on fatigue crack growth behavior in detail, additional tests at frequencies ranged from 15 to 0.01Hz were conducted under a constant ΔK of 3.25MPam1/2. Effect of frequency was clearly observed in low ΔK region, where fatigue crack growth rate decreased with decreasing frequency. Crack closure would be a dominant factor for the frequency effect observed under immersed NaCl environment at frequencies ranged from 15 to 0.5Hz. However, fatigue crack growth rates at frequencies lower than 0.05Hz were higher than those at frequencies higher than 0.5Hz. The accelerated fatigue crack growth rates at frequencies lower than 0.05Hz would be attributed to the corrosion attack at the crack tip.
Journal: Materials Science and Engineering A-structural Materials Properties Microstructure and Processing - MATER SCI ENG A-STRUCT MATER , vol. 528, no. 6, pp. 2509-2516, 2011
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