Özet:

There are limiting factors for the use of magnesium in powder metallurgy. Powdered Mg can oxidize quickly in contact with air and it has the risk of ignition even from friction caused by the contact of powders to each other in processes such as mixing. There is a need to provide measures to make the production of Mg alloys by powder metallurgy method easier and to produce new Mg alloys by these methods. In this study, Mg7Sn2Zn-xMn magnesium alloys with different ratios of Mn content were successfully produced by hot pressing method and the effect of Mn addition on microstructure and mechanical properties was investigated. Coating technique was applied to Mg alloys before mixing the powders. Hot pressing and graphite mold system are used in the production of alloys. Sintering processes were carried out in argon protective gas atmosphere. Density measurement, metallographic analysis and tensile tests were applied to the produced Mg alloys. According to the results obtained, the density values measured from the alloys produced by the hot pressing method are very close to the theoretical density values (relative densities with 98.97% and above). Alloys with non-porous microstructure were produced due to the simultaneous application of pressure and sintering processes. Secondary intermetallic phases were determined in the microstructure and it was noticed that these phases were concentrated at the grain boundaries. Both the strength and ductility properties of the alloys are developed depending on the increasing Mn ratio. The maximum tensile strength (217.2 MPa) was obtained from TZM720-B alloy.

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