Casting in the Semi-Solid State of ZK60 Magnesium Alloy Modified with Rare Earth Addition

E.P. Silva; Larissa Fernandes Batista; Bruna Callegari; Ivan Feierabend; Ricardo Henrique Buzolin; Rodrigo Santiago Coelho; Fernando Gustavo Warchomicka; Guillermo C. Requena; Haroldo Pinto

doi:10.4028/www.scientific.net/AMR.922.694

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 922Casting in the Semi-Solid State of ZK60 Magnesium...

Casting in the Semi-Solid State of ZK60 Magnesium Alloy Modified with Rare Earth Addition

Abstract:

In this work, the casting process under mechanical agitation in the semi-solid state was investigated for the production of ZK60 magnesium alloy modified with the addition of 2.5% wt of mischmetal. The results show that this process enables the production of ingots with homogeneous chemical composition and free of shrinkage, inner defects and internal oxidation. The as-cast microstructure consists of an α-Mg matrix with globular grains reinforced by a grid of distinct intermetallics of Mg-Zn, Mg-Zn-RE and Mg-RE type along the grain boundaries. The yield strength at room temperature undergoes more than 50% increase during direct T5 aging, thus reaching 170 MPa. At 300°C, however, the dispersion of nanometric precipitates does not modify the hot deformation behavior of the aged alloy, which undergoes dynamic recrystallization in a similar manner to the as-cast alloy. DRX at 300°C is fastest for the alloy solution-treated at 500°C.

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Periodical:

Advanced Materials Research (Volume 922)

Pages:

694-699

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.922.694

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Online since:

May 2014

Authors:

E.P. Silva*, Larissa Fernandes Batista, Bruna Callegari, Ivan Feierabend, Ricardo Henrique Buzolin, Rodrigo Santiago Coelho, Fernando Gustavo Warchomicka, Guillermo C. Requena, Haroldo Pinto

Keywords:

Casting, Magnesium, Rare Earth, Semi-Solid

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