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논문 기본 정보

자료유형
학술저널
저자정보
Y. Galindez (Universidad de Antioquia UdeA) E. Correa (Universidad de Medellín) A. A. Zuleta (Universidad Pontificia Bolivariana) A. Valencia‑Escobar (Universidad Pontificia Bolivariana) D. Calderon (Universidad de Antioquia UdeA) L. Toro (Universidad de Antioquia UdeA) P. Chacón (Universidad Pontificia Bolivariana) F. Echeverría E. (Universidad de Antioquia UdeA)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.5
발행연도
2021.1
수록면
1,113 - 1,130 (18page)

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Powders of commercially pure magnesium (c.p. Mg), AZ91 magnesium alloy and zinc were milled using a high-energy mill.The effect of high energy milling (HEM) on powders morphology, chemical composition, crystallite size and compactionof different powders mixtures were studied. After compaction, samples were thermally treated at 450 °C and both densityand hardness were evaluated. It was found that as milling speed and time increases, the AZ91 alloy and c.p. Mg particleswere deformed and fractured up to sizes below 10 μm. X-ray diffraction patterns for both the c.p. Mg and the AZ91 powdersrevealed that the milling process induced changes in both the α-Mg and the β-Mg17Al12 phases. By increasing the millingspeed, the crystallite size decreases by up to 70% for AZ91 powders and by 80% for magnesium powders. The relativedensities of the compacted AZ samples were greater than 85% and this parameter increased for all samples after thermaltreatment at 450 °C, obtaining densities higher than 88%. Hardness measurements disclosed values as high as 84.3 HR15T.Theoretical calculations of mechanical strength were obtained for all samples based on the hardness values measured, findingvery encouraging results for the three Mg alloys.

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