순 마그네슘 분말의 기계적 밀링 거동

• Published in: 대한금속·재료학회지, 53(10) Vol. 53; no. 10; pp. 721 - 728
• Main Authors: 구성모, Seoung Mo Koo, 김긍호, Gyung Ho Kim, 황대연, Dae Youn Hwang, 김혜성, Hye Sung Kim
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 05.10.2015; 대한금속·재료학회
• Subjects: mechanical alloying/milling; pure magnesium; TEM; transmission electron microscopy; X-ray diffraction; 재료공학
• ISSN: 1738-8228; 2288-8241
• DOI: 10.3365/KJMM.2015.53.10.721

The microstructural evolution and mechanical properties during mechanical milling of pure magnesium powders were investigated as a function of the milling time and processing control agent. Commercially pure magnesium powders were mechanically milled in a SPEX 8000 shaker Mixer/Mill in an inert atmosphere. From the TEM observations and the analysis of the X-ray diffraction patterns, the steady state grain size was approximately 75 nm regardless of the addition of a processing control agent, while the milling time to reach steady state was shorter when a processing control agent (1wt% stearic acid) was added to the pure magnesium. It is noteworthy that the steady state hardness of the pure magnesium with the processing control agent was hardly different from that of the pure magnesium milled without PCA. Hence, we conclude that the oxides present in the magnesium surface function the same as that of the PCA, and their effectiveness is dependent on the characteristics of the magnesium surface oxides broken by mechanical milling.