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SiCw 강화 2124 Al 기 복합재료의 제조 및 기계적 특성
이호인,유연철,전정식 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.3
Fabrication and tensile properties were studied on SiC whiskers reinforced 2124Al matrix composites. The composites were fabricated by vacuum hot pressing at 520℃ following hot extrusion at an extrusion ratio of 20 : 1 and at 470℃. After solution heat treatment at 495℃ and 4 hours the tensile tests were performed with aging heat treatment at 177±3℃. At peak aged condition(177±3℃, 5 hours), the tensile strength and elastic modulus were 700 MPa and 115 GPa, respectively. The fractures sources were found to be cavities initiated at the ends of SiC whiskers and fractured Mn-containing particles. On solution heat treated conditions the cleavaged fractures were predominant in matrix and cavities initiated at the sides of SiC whiskers, partialy.
Al-(0.6, 1.3) wt % Fe 합금의 고온변형 및 조직에 관한 연구
이호인,유연철,전정식,한형기 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.2
High temperature dynamic softening characteristics related to microstructures have been examined for Al-(0.6, 1.3)wt%Fe alloys deformed in torsion at temperatures between 300℃ and 500℃, and at strain rates of 2.65×10^(-2)/sec to 1.2/sec. The flow stress as a function of strain rose to a maximum value then gradually decreased towards a steady state deformation. The effect of temperature on the flow stress was more pronounce than that of strain rate in this experimental range. The high temperature restoration mechanism was found to be dynamic recrystallization(DRX). From the relations between flow stresses and microstructures including intermetallic compounds at specific points on a flow curve, it can be assumed that the intermetallic compounds promoted dynamic recrystallization and prohibited grains from growing during the high temperature deformation. The relation between Zenner-Hollomon parameter, Z, and the microstructure was also studied and the equiaxied DRX grains were shown at low value of Z range.