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Cu 첨가가 ZK60 마그네슘 합금 압출재의 미세조직 및 기계적 성질에 미치는 영향
박성혁 ( Sung Hyuk Park ),여휘 ( Hui Yu ),김하식 ( Ha Sik Kim ),배준호 ( Jun Ho Bae ),임창동 ( Chang Dong Yim ),유봉선 ( Bong Sun You ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.3
The effects of copper (Cu) addition on the microstructure and mechanical properties of ZK60 alloy were investigated using an optical microscope (OM), a scanning electron microscope (SEM), and electron backscatter diffraction (EBSD) and by performing tensile tests of indirect-extruded ZK60 alloys with 0.5, 1.0, and 1.5 wt% Cu contents. The results revealed that the as-extruded ZK60 alloy had a bimodal grain structure composed of fine recrystallized grains and coarse unrecrystallized grains. The homogeneity of the microstructure was increased by Cu addition due to the promotion of dynamic recrystallization (DRX) by particle stimulated nucleation (PSN) at the Mg-Zn-Cu particles. This enhanced DRX behavior resulted in the reduction of the average grain size and weakening of the basal fiber texture of the as-extruded alloys. The yield and tensile strengths were improved by the Cu addition owing to the decreased grain size and increased number of particles, while the elongation was decreased due to the hard Mg-Zn-Cu particles.
박찬호 ( Chan Ho Park ),정후영 ( Hu Young Jeong ),엄갑식 ( Gab Sik Eom ),손현택 ( Hyeon Taek Son ),여휘 ( Hui Yu ),박성수 ( Sung Soo Park ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.1
Abstract: Two Al-Mg alloys were subjected to extrusion for fabricating ferrules and the mechanical behavior of the extruded ferrules was investigated. To estimate the proper extrusion conditions, the power dissipation efficiency and plastic instability of the Al-Mg alloys were assessed by the construction of deformation processing maps. The Al-1.5Mg alloy ferrule had a higher work hardening capacity than the Al-0.9Mg alloy ferrule, which resulted in a higher load bearing capacity in the former during the extension test of wire rope slings.