Influence of Molybdenum on Structure of Alloy AlSi9Cu3
Processy litʹâ, 2020, Tom 141, №3, p.42-46
DOI:
https://doi.org/10.15407/plit2020.03.042Keywords:
Modification, silumins, AlSi9Cu3, molybdenum, structureAbstract
Received 21.08.2020
UDC 669.715’28: 66.046.516
The work is devoted to the study of the influence of molybdenum on the structural characteristics of the cast aluminum alloy AlSi9Cu3 (AK8M3). Among the large number of modifiers and microalloying additives used to improve the structural-phase characteristics and mechanical properties, the effect of molybdenum is still insufficiently investigated. The known data of the positive effect of molybdenum addition on the structure and properties of some cast aluminum alloys was analyzed. It was found that the studies concerned mainly on the castings quality and defects, as well as mechanical properties at elevated temperatures. Based on this, the aim of the work was to investigate the structural-phase state of the AlSi9Cu3 alloy after doping with molybdenum. As a modifier, a Al-Mo master alloy with a molybdenum content of 3.65% mass was used. The original alloy and the modified alloy were compared. The molybdenum-modified melt was poured into a heated graphite mold and cooled copper mold to investigate the effectiveness of the modifier at different rates of cooling and crystallization of the melt. In the course of research it was found that the modified alloy, compared to the original, pured in graphite form, has a coarser-grained structure and iron-containing phases of larger sizes. In this case, the eutectic of such a sample is more evenly distributed and contains more components of Al2Cu and molybdenum. The rapid crystallization of the modified melt led to the appearance of molybdenum in the solid solution based on aluminum and more efficient grinding of iron-containing phases. Thus, it was found that the modification of the Al-Si-Cu cast alloy system with molybdenum has a greater effect on the change of chemical composition, shape and size of individual phases and structural components and has no pronounced nucleating effect.
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