Aluminum Alloys Sparingly Alloyed with Scandium
The development paths of Al-Mg-Sc alloys sparingly alloyed with scandium are described in the article. The main principle of the development of Al-Mg-Sc alloys sparingly alloyed with scandium is to introduce scandium together with zirconium in equal amounts (0.11-0.15 %). An increase in the zirconium content above this amount leads to the formation of undesirable primary intermetallic compounds (Al3Zr). To provide the further reduction of the scandium content, it is recommended to add hundredths of a percent of transition and rare-earth metals, which have a noticeable solubility in the Al3Sc phase and replace a part of the scandium. It is necessary to carry out appropriate experiments to select such metals and their amount. The actual properties of the Al-Mg-Mn-Sc-Zr alloy 01570-1 sparingly alloyed with equal contents of scandium and zirconium are given.