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급냉응고/분말야금법으로 제조된 Al-Fe-V-Si 합금의 기계적 성질 (2) : 파괴기구에 관한 연구 Micromechanism of Fracture
이종철,이두영,이성학,김낙준 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.4
This study is concerned with a correlation between the microstructure and the micromechanism of fracture processes in an RSP/PM Al-8.5Fe-1.3V-1.7Si alloy. The specimens were exposed to the temperatures ranging from 150℃ to 480℃ for 100 hours, followed by room temperature tensile tests, fracture toughness tests and void initiation tests. This RSP/PM Al alloy did not show any significant change in room temperature tensile strength, tensile elongation and fracture toughness even after exposure up to 425℃ for 100 hours. However, tensile elongation and fracture toughness decreased significantly after exposed to 480℃ for 100 hours. Detailed microstructructural analyses showed that the alloy ahs a band structure due to non-uniform distribution of the silicide dispersoids. After exposure to 480℃, the formation of θ-Al₃Fe phases occurs at band structure boundaries by the dissolution of coarse silicide dispersoids, resulting in a loss of ductility and fracture toughness. The micromechanical processes involved in void and microcrack formation were identified and quantified. The results are interpreted using a simplified ductile fracture initiation model based on the basic assumption that crack extention starts to occur at a certain critical strain over a microsturcturally significant critical distance. This model enables us to correlate fracture toughness and microstructure, confirming that the formation of θ-Al₃Fe phases is the main metallurgical factor which contributes to the embrittlement phenomenon after exposure to 480℃ for 100 hours.
일엽초(Lepisorus thunbergianus)의 부탕올 추출물이 생체 지질 과산화에 미치는 영향
정연봉,안문규,이종철 慶星大學校 1993 論文集 Vol.14 No.4
In this study, we examined the anti-lipid peroxidative effects of lepisorus thunbergianus on CCl₄ induced lipid peroxidation in rats, and elucidated the anti-lipid peroxidative mechanism. In rat liver homogenate intoxicated with CCl₄(0.5ml/100g), BuOH fraction of Lepisorus thunbergianus (100mg/Kg/day) exhibited 84.90% anti-lipid peroxidative effect but in serum 79.63% inhibitory effects, respectively. In mitochondrial and microsomal fraction showed inhibition of 55.32% and 61.05%, respectively. In order to elucidate the mechanism of anti-lipid peroxidation effects of Lepisorus thunbergianus, enzymatic(NADPH dependent) and non-enzymatic(Ascorbic acid catalyzed) reaction, in vitro, were performed. In enzymatic reaction, Lepisorus thunbergianus exhibited 60.64% anti-lipid peroxidation effects, but in non-enzymatic reaction exhibited 47.92% inhibition. Therefore, it is noteworthy that antioxidative power of them may mainly results from the inhibition by enzymatic reaction.