발간논문

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Vol.31, No.9, 1172 ~ 1181, 1993
Title
Effect of PFZ on the fracture toughness and Stress Corrosion Cracking of 7475 Aluminum Alloy
박희준Hee Jun Park, 곽희석Hee Seog Kwak, 신동혁Dong Hyuk Shin, 맹선재Sun Chae Maeng
Abstract
Effect of Precipitation free zone(PFZ) width on the fracture toughness and stress corrosion cracking(SCC) of 7475 aluminum alloy has been studied. The different PFZ width was obtained by controlling the cooling rate following solution treatment in the thermomechanical treatment of this study. PFZ width was also varied by aging treatment of different stages. By increasing the PFZ width stress intensity factor, K_(lc) has been increased in the under-and peak-aged conditions. Over-aged state has shown lower value of K_(lc) than the under-and peak-aged state when compared in the same level of PFZ width. However, when compared in the same over-aged condition, increased PFZ width resulted increased fracture toughness. The effect of PFZ width on the SCC has been studied in the under-aged condition by the crack-growth-rate test. Increased PFZ width resulted increased K_(lscc) and lower plateau velocity, which denotes the decrease of SCC sensitivity.
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