DefinePK

Abstract

The paper presents the research results of obtaining aluminum alloys modificators. Complex ligature AKCe (wt.%: 30 Al, 28 REM, 4 Ca, the rest is Ni), which is a traditional additive in cast irons, was used as ? metallurgical charge for obtaining new modifying alloys. The melting point of the master alloy used in the experiments is 1400 ° C. Modifying alloys from ligature were obtained in two ways. In the first way, aluminum (A7) was melted, and then different amounts of AKCe powder were added to the superheated (1400° C) aluminum melt. In the second method different amounts of aluminum (A7) were added to the molten (1400° C) master alloy. The melting was carried out in Tamman furnace where a protective atmosphere of technically pure argon was created. In both methods of producing the modifier, the component was added in the amount of 20% to 70% by weight. The element composition analysis of the resulting alloys showed that, when adding 60 wt. % (AKCe or A7) the element composition and melting point were not significantly different, regardless of the production method having been used. The micro-X-ray spectral analysis showed that the initial ligature alloy consisted of intermetallides Al-Ni-RZM, Al-Ni and Al-Ca. The obtained alloys, regardless of the method of their production, consisted of an a-solid solution of Ni in Al and intermetallides of Al-Ni, where instead of the intermetallic compound AlNi the intermetallide Al3Ni was formed which appeared to have a lower melting point and better plastic properties.