表面改質Mg合金鋳物の軽量化設計法の構築と安全性保証 : HAE陽極酸化処理を施したAZ91D材の疲労強度に及ぼす極硬質スピネル皮膜の影響(<小特集>材料・構造の衝撃問題)

概要

論文の詳細を見る
The fatigue properties of magnesium alloy casting, AZ91D, and the same material with HAE anodized, were investigated with a special view of mesoscopic fracture analysis. The main results obtained are as follows : (1) The fatigue strength of magnesium alloy casting was improved by HAE anodizing. Futhermore, the fatigue strength ratio, that is strength/density, of magnesium alloy casting was higher than that of aluminum alloy casting. (2) Through fractography using SEM, it was found that the crack initiated at casting defect under the film in anodized material. (3) The mesoscopic factors of fracture origin, consisted of defects and matrix microstructure, could be quantitatively related to the fracture mechanism. It could be concluded that the improvement in the fatigue strength of anodized material would be caused by the retardation of growth of "meso-crack"due to which had been formed from a casting defect under film.
社団法人日本機械学会の論文
1997-12-25