Microstructure and Residual Stress Formation during Friction-Stir Welding of Semi-Solid Cast ZK60-RE Magnesium Alloy

E.P. Silva; Larissa Fernandes Batista; Bruna Callegari; Victor Ferrinho Pereira; Ricardo Henrique Buzolin; Rodrigo Santiago Coelho; Fernando Gustavo Warchomicka; Guillermo C. Requena; Antonio José Ramirez; Haroldo Pinto

doi:10.4028/www.scientific.net/AMR.922.688

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 922Microstructure and Residual Stress Formation...

Microstructure and Residual Stress Formation during Friction-Stir Welding of Semi-Solid Cast ZK60-RE Magnesium Alloy

Abstract:

In this work, we report on the friction stir weldability of a semi-solid cast ZK60 alloy modified with 1.5 wt% mischmetall in the lap-joint configuration using a 120WV4 steel tool with concave shoulder and conical pin. The coarser solidification microstructure in the semi-solid cast ZK60-1.5%RE alloy requires low strain rates and increased heat input to produce lap-joints without inner defects. This was achieved with 250 rpm tool rotation and 50 mm/min welding speed. Friction stir welding results in a very fine grained microstructure in the stir zone probably due to dynamic recrystallization. In the thermomechanically affected zones dynamic recrystallization seems to occur within the solute enriched intergranular zones. The distribution of longitudinal residual stresses exhibit stress maxima at both thermomechanically affected zones. A compression peak is observed at the retreating side, whereas a tensile stress maximum occurs at the advancing side.

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Periodical:

Advanced Materials Research (Volume 922)

Pages:

688-693

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.922.688

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Online since:

May 2014

Authors:

E.P. Silva*, Larissa Fernandes Batista, Bruna Callegari, Victor Ferrinho Pereira, Ricardo Henrique Buzolin, Rodrigo Santiago Coelho, Fernando Gustavo Warchomicka, Guillermo C. Requena, Antonio José Ramirez, Haroldo Pinto

Keywords:

Friction Stir Welding (FSW), Magnesium, Rare Earth, Residual Stress

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* - Corresponding Author

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