Abstract
Magnesium alloys containing rare earth elements offer excellent strength at room temperature as well as at elevated temperatures and are distinguished by a high ignition-resistance. However, with regard to cost efficiency and the conversation of resources, these alloys are not suitable for commercial industrial applications. Therefore, the research project SubSEEMag at the Institute of Metal Forming/Technische Universität Bergakademie Freiberg focusses on the development of alternative alloy compositions, which meet the requirements on materials properties of magnesium alloys for industrial applications and production costs. Several magnesium alloys containing zinc, aluminum, manganese and calcium were poured in cylindrical molds at the Helmholtz-Zentrum Geesthacht. The characterization of the as-cast condition was carried out by light and scanning electron microscopy. Phase compositions were determined using EDX analysis. The Mg alloys were homogenized at different temperatures. Afterwards, hot rolling to a final thickness of 2.7 mm was conducted. The influence of temperature and time of the annealing on the microstructure and the mechanical properties of the hot rolled condition have been investigated. The results were discussed in comparison to commercial available Mg-RE alloys.
Highlights
Magnesium alloys, especially magnesium-rare earth systems (Mg-RE), offer attractive properties for applications in the aerospace and automotive industries
Characterization of the Initial State: Optical (Fig. 3) and scanning electron microscopy (Fig. 4) were carried out in order to characterize the microstructure of the investigated magnesium alloys in the as-cast condition (Fig. 2)
The microstructure of the MX21 (Fig. 3c) alloy comprises fine grains of the α-magnesium with secondary phase precipitation arranged along the grain boundaries
Summary
Especially magnesium-rare earth systems (Mg-RE), offer attractive properties for applications in the aerospace and automotive industries. For structural parts the development of magnesium wrought alloys with high strength, good corrosion resistance and enhanced formability is required. The above alloys are characterized by good strength properties at room temperature as well as at elevated temperatures, sufficient weldability and high creep resistance. The increased strength properties of magnesium alloys with RE addition are mainly attributed to two major strengthening mechanisms: precipitation hardening and solid solution strengthening. G. aluminum or zinc, the effect of solid solution strengthening by gadolinium or yttrium is much higher. Calcium, manganese and zinc seem to be potential candidates for developing alternative magnesium alloys, which offer a comparable
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