Al, Al-7%Mg 合金薄膜の疲労き裂先端近傍の転位組織

概要

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To clarify the fatigue crack propagation process, thin foils of annealed and 90% rolled, aluminum and aluminum-7% magnesium alloy are fatigued and their dislocation structures near the fatigue cracks are observed by a transmission electron microscope at 2000 Kv. Within about l〜2μ from the fatigue crack, fine subgrains less than 1μ^φ are observed. The size of these subgrains in the annealed specimen is similar to that formed in the rolled specimen of the same material, but the average size of these subgrains formed in aluminum specimen is larger than that in aluminurn-7% magnesium alloy specimen. In the region more than 2μ away from the fatigue crack, the different structures of subgrains are obviously observed in the annealed and in the rolled specimens, and this region might be responsible for the difference in the mode of fatigue crack propagation of these specimens.
社団法人日本材料学会の論文
1975-01-15