Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2015 - zeszyt 5

Effects of mechanical alloying conditions on the properties of Mg-based nanomaterials

10.15199/28.2015.5.5

nr katalogowy: 94642
10.15199/28.2015.5.5

Various methods can be used to improve properties of Mg-based materials. These modifications include alterations of the chemical composition or microstructure modification. Nanostructured Mg-based alloy powders were produced by mechanical alloying method. The effect of different milling conditions on the microstructure evolution during mechanical alloying of Mg-type alloys with a nominal composition Mg-4Y-5.5Dy-0.5Zr, Mg-1Zn-1Mn-0.3Zr was studied. Bulk nanostructured Mg-type materials were finally obtained by the application of powder metallurgy. The evolution of microstructure and mechanical properties of Mg-based alloys were investigated. Compared to microcrystalline magnesium synthesized samples exhibit higher microhardness. This effect is directly associated with structure refinement and obtaining a nanostructure. Data concerning corrosion of nanostructured Mg-type alloys are scarce. In this paper, the corrosion behaviour of synthesized bulk Mg-based alloys containing different elements were investigated by immersion test in 0.1 M NaCl. The potentiodynamic corrosion test results indicate that addition of alloying elements shifts the corrosion potential to the less negative values. Nanocrystalline Mg-based alloy with enhanced mechanical and corrosion properties can be used in the automotive and marine industries. Key words: magnesium, mechanical alloying, nanostructure.1. INTRODUCTION Nanocrystalline materials produced by the application of non-equilibrium processing techniques, such as mechanical alloying (MA) or severe plastic deformation (SPD) demonstrate novel properties compared to conventional (microcrystalline) materials [1, 2]. Nanomaterials can include metals, ceramics, and composite materials, and they demonstrate novel properties compared to conventional (microcrystalline) materials because of their nanoscale features. Mechanical alloying is a powder processing technique that enables the production of nanomaterials starting [...]

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