Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.13087/1125
Title: Mechanical properties of Mg-based materials fabricated by mechanical milling and spark plasma sintering
Authors: Karasoğlu, Mutlu
Karaoğlu, Serdar
Arslan, Gürsoy
Keywords: Magnesium
mechanical milling
spark plasma sintering
nanostructures
mechanical behavior
Issue Date: 2019
Publisher: Sage Publications Ltd
Abstract: In this work, magnesium powders of different grain sizes were synthesized by mechanical milling for periods ranging from 0.5 to 30 h. Subsequent to milling, powders were consolidated by spark plasma sintering at 550 celcius for 10 min. Before and after sintering, microstructural changes were investigated by analytical methods including X-ray diffraction (XRD), X-ray spectrometer, optical and electron microscopy. Analyses showed that nanocrystalline sizes were achieved by mechanical milling for milling times exceeding 5 h. Additionally, it was recognized that grain growth occurred during sintering, but to a limited extent. Mechanical test results displayed reasonable improvements in both compressive yield strength and hardness values with increasing milling times up to 5 h, where these reached their maximum values (245.5 MPa and 75.9 HV). The enhancement in these properties with increased milling time up to 5 h was attributed to both the extent of grain refinement and the formation of MgO together with incorporation of Fe particles, originating from the milling process, into the matrix. On the other hand, a substantial decrease in yield strength and hardness values in the samples milled in excess of 5 h were recorded, which in turn was related to the accompanying decline in bulk density of the samples. Microstructural analysis of the deformed samples revealed that grain size reduction suppressed twin formation, which elucidates the enhancement in ductility with decreasing grain size.
URI: https://doi.org/10.1177/1464420718805119
https://hdl.handle.net/20.500.13087/1125
ISSN: 1464-4207
2041-3076
Appears in Collections:Scopus İndeksli Yayınlar Koleksiyonu
WoS İndeksli Yayınlar Koleksiyonu

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