AFM Study on Crack Initiation and Growth Behavior in an Extruded Aluminum Alloy 2024-T3
抄録
In the present study, rotating bending fatigue tests were performed on an extruded aluminum alloy 2024-T3 to study a crack initiation and growth behavior on the smooth un-notched specimen. Effect of microstructure of the material on the crack initiation and growth behavior was also studied using an atomic force microscope, AFM. Small crack with a length of 1-2μm initiates at grain boundary in the very early stage of fatigue life, N/N_f=6-10%. So the fatigue life is almost considered as a crack propagation life. The initiated crack propagated very slowly along the grain boundary especially at the lower stress amplitude region. The S-N curve can be estimated from an integration of the relation da/dN vs. M, the parameter proposed by authors.
雑誌名
日本機械学會論文集. A編 = Transactions of the Japan Society of Mechanical Engineers. A
原子間力顕微鏡によるアルミニウム合金押出材2024-T3の疲労き裂発生と進展挙動の観察
機械論文A05-479.pdf
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