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Srinivasan, V. P.
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article
Analysis of Cast Aluminium-Zinc Alloy Surface Fatigue Crack Formation Growth Characteristics
Abstract
<jats:p><div class="section abstract"><div class="htmlview paragraph">Utilizing a scanning electron microscope, research was conducted on the formationof fatigue microcracks in a cast AF620 alloy. The results of fatigue microcrackpropagation under escalating levels of stress indicate that the interdendriticor grain boundaries of Al grains are crucial for microcrack propagation. InAl78Zn25 regions, fatigue fractures frequently form within the grains, but ifthe stress concentration is high enough, they can also form at the base of thecrevice on the grain boundaries. The fatigue fracture propagates in a wave-likepattern under a microscope. It was proposed that the length of the crack and therate of formation of fatigue microcracks could be correlated to ascertain theopening displacement at the tip of the crack.</div></div></jats:p>