Microstructure and residual stresses in a friction stir welded butt joint of as-cast ZK60 alloy containing rare earths - Silva, Erenilton Pereira da; Oliveira, Verona Biancardi; Ferreira, Victor Ferrinho; Maluf, Omar; Buzolin, Ricardo Henrique; Pinto, Haroldo Cavalcanti (Materials Research: revista ibero-americana de materiais, 2017)