Investigation of structure, mechanical properties and corrosion resistance of semi-products from Al—5Mg wrought alloys alloyed by Sc, rare earth and transition metals


I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Electron Microscopy and Strength of Materials - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2014, #20


The methods for improving the mechanical characteristics of the 3 mm sheets Al—5Mg alloy, with high corrosion resistance due to alloying by Sc, Zr, Ti, Ce, Nb were studied. It is shown that in the structure of sheets are not recrystallization due to coherent with the matrix particles Al3(Sc, Zr). Conclusion about the effect of scandium on the increase of internal stress and saving of strain hardening was made on the basis of studies of the physical broadening of the diffraction lines. Developed alloys have satisfactory plasticity and strength characteristics on 17—47% higher than standard Al—5Mg alloys without scandium. Fracture of these alloys occurs by ductile pit mechanism. It has been established that the alloy with scandium in an initial state has a corrosion rate lower than unalloyed. After annealing at 175 °C during 10 hours alloy with scandium has twice higher level of corrosion resistance than the base alloy. Full text download