TY - JOUR
T1 - Casting in the semi-solid state of ZK60 magnesium alloy modified with rare earth addition
AU - Da Silva, Erenilton Pereira
AU - Batista, Larissa Fernandes
AU - Callegari, Bruna
AU - Feierabend, I
AU - Buzolin, Ricardo Henrique
AU - Coelho, Rodrigo Santiago
AU - Warchomicka, Fernando Gustavo
AU - Requena, Guillermo
AU - Pinto, Haroldo Cavalcanti
PY - 2014
Y1 - 2014
N2 - 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.
AB - 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.
UR - http://www.scientific.net/AMR.922.694
U2 - 10.4028/www.scientific.net/AMR.922.694
DO - 10.4028/www.scientific.net/AMR.922.694
M3 - Article
SN - 1662-8985
VL - 922
SP - 694
EP - 699
JO - Advanced Materials Research
JF - Advanced Materials Research
ER -