Investigation of the compressibility and sinterabilty of AZ91 powder production and particle production by gas atomisation method

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dc.authoridAKKAS, Mehmet/0000-0002-0359-4743
dc.contributor.authorAkkas, Mehmet
dc.contributor.authorBoz, Mustafa
dc.date.accessioned2024-09-29T15:57:40Z
dc.date.available2024-09-29T15:57:40Z
dc.date.issued2019
dc.departmentKarabük Üniversitesien_US
dc.description.abstractThis study intends to determine the pressability and sinterability of AZ91 powder production by gas atomisation method and that of the produced powder for partial production. Therefore, first, a gas atomisation unit has been designed and manufactured in the laboratories of the Karabuk University, Department of Manufacturing Engineering. Atomised powder production has been achieved at a temperature of 795 degrees C, with nozzle diameters of 2 and 4 mm and four different gas pressures (5, 15, 25, 35 bars). Argon gas has been used for atomisation and as a protective gas atmosphere. Scanning electron microscope (SEM) is used to determine the shape of the produced AZ91 powder, and a laser particle size analyzer is used to analyze the powder size. Additionally, a microhardness (HV0.025) measurement has been conducted to determine the hardness of the produced powders. To achieve a homogeneous distribution, the produced powders are mixed in a three-dimensional moving turbulator for 30 min. Mixed powders have been pressed at 300, 400, 500 and 600MPa and have been sintered at 500 degrees C, 550 degrees C and 600 degrees C. Additionally, the density values have been determined before and after sintering of the materials. SEM images have been obtained from the fractured surfaces of the samples before and after sintering. XRD and EDX analyses have been performed to determine the chemical composition. Further, microhardness (HV0.5) is obtained from the pressure surfaces of the samples to determine the effects of the pressing pressure and the sintering temperature on the hardness. As a result of the experimental studies, it has been observed that the powder size decreases with the increase in gas pressure and that the powder shape generally changes from ligament and complex shape to droplet and spherical shape. From the XRD, XRF and EDX results, it has been determined that the structure comprises an alpha phase (Mg main matrix) and Mg17Al12 interphase, which is beta phase, and very small amounts of MgO have been observed. The hardness of the produced powders increased based on the increase in gas pressure. The densities of the samples increased with both increasing pressing pressure and sintering temperature. It has been observed from the fractured surface SEM images that the number of pores formed in the samples decrease with an increase in the pressing pressure. It has been determined that the post-sintering structure exhibits a typical dendritic structure. In addition to the alpha-Mg matrix phase, beta (Mg17Al12) intermetallic and alpha + beta eutectic were formed in the structure. The microhardness values of the samples decreased depending on the sintering temperature; the highest hardness value was measured as 64,02 HV0.5 at a pressing pressure of 300 MPa and a sintering temperature of 500 degrees C, whereas the lowest hardness value was measured as 54,86 HV0.5 at a pressing pressure of 600 MPa and a sintering temperature of 600 degrees C. (C) 2019 Published by Elsevier B.V. on behalf of Chongqing University.en_US
dc.identifier.doi10.1016/j.jma.2019.05.007
dc.identifier.endpage413en_US
dc.identifier.issn2213-9567
dc.identifier.issue3en_US
dc.identifier.scopus2-s2.0-85070106270en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage400en_US
dc.identifier.urihttps://doi.org/10.1016/j.jma.2019.05.007
dc.identifier.urihttps://hdl.handle.net/20.500.14619/4931
dc.identifier.volume7en_US
dc.identifier.wosWOS:000487287600005en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherKeai Publishing Ltden_US
dc.relation.ispartofJournal of Magnesium and Alloysen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectGas atomisationen_US
dc.subjectAZ91 alloy powderen_US
dc.subjectGas pressureen_US
dc.subjectNozzle diameteren_US
dc.subjectPressingen_US
dc.subjectSinteringen_US
dc.titleInvestigation of the compressibility and sinterabilty of AZ91 powder production and particle production by gas atomisation methoden_US
dc.typeArticleen_US

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