Influence of the structure of charge billets, overheating, and holding time of melts on the properties of Al-5 wt % Cu alloys in liquid and solid states

• Published in: Russian journal of non-ferrous metals Vol. 56; no. 2; pp. 165 - 170
• Main Authors: Nikitin, K. V., Nikitin, V. I., Timoshkin, I. Yu, Krivopalov, D. S., Chernikov, D. G.
• Format: Journal Article
• Language: English
• Published: New York Allerton Press 01.03.2015; Springer Nature B.V
• Subjects: Alloys; Billets; Charge; Charge density; Charge preparation; Chemistry and Materials Science; Density; Electric charge; Foundry; Materials Science; Melts; Metallic Materials; Overheating; alloys of the Al-Cu system; density of melts; aluminum alloys; charge metals and alloys; deformed waste; structural heredity
• ISSN: 1067-8212; 1934-970X
• DOI: 10.3103/S1067821215020157

The influence of the structure of charge bars, overheating temperatures, and isothermal holding time of Al-5 wt % Cu melts on their properties in solid and liquid states is investigated. It is revealed using the express method that the density of melts prepared from fine-crystalline charge bars (F-c charge) has reduced values compared with the melts prepared from coarse-crystalline charge bars (C-c charge). This peculiarity is retained over the entire studied range of overheating temperatures (760–1060°C). The influence of the structure of initial charge bars manifests itself in the second generation (after melting and crystallization from the corresponding overheating temperatures): alloys fabricated from the F-c charge have a smaller dendritic parameter α-Al and increased density and electrical conductivity compared with the alloys made from the C-c charge. It is shown that the involvement of deformed aluminum and copper waste into the charge composition provides a finely dispersed structure and increased density of Al-5 wt % Cu alloys in the solid and liquid states.