Nanocomposites and nanomaterials

Structure and properties of Al-Mg-Sc-Zr-Er alloy after nanoscale precipitation hardening
Ostash O.P.1, Polyvoda S.L.2, Chepil R.V.1, Vasyliv B.D.1, Podhurska V.Ya.1
1 Department of Hydrogen Technologies and Alternative Energy Materials, Karpenko Physico-Mechanical Institute of the NAS of Ukraine, 5 Naukova str., Lviv 79060, Ukraine.
E-mail: podhurskavika@gmail.com
2 Vacuum Technology Laboratory, Physico-Technological Institute of Metals and Alloys of the NAS of Ukraine, 34/1 Vernadskoho blvd., Kyiv 03142, Ukraine.

The morphology of the structure, phase composition and characteristics of strength and plasticity of the Al-4.5Mg-0.4Mn-0.3Sc-0.1Zr-0.05Er cast alloy, obtained using the technology of magnetohydrodynamic mixing of the melt, have been studied. The influence of micro- (1-30 µm) and nanosized (1-100 nm) intermetallics of Al, Sc, Zr, and Er on the mechanical and corrosion characteristics of the investigated alloy in cast and heat-treated (aging or homogenizing annealing) states was evaluated. It is shown that the cast alloy of the Al-Mg system after nanoscale precipitation hardening exhibits a 1.5-2-fold increase in strength without a significant decrease in plasticity. It was found that this slightly increases its sensitivity to the negative effects of the corrosive environment (3% NaCl aqueous solution).