Use of Friction Stir Processing for Improving Heat-Affected Zone Liquation Cracking Resistance of a Cast Magnesium Alloy AZ91D

• Published in: Metallurgical and materials transactions. B, Process metallurgy and materials processing science Vol. 48; no. 6; pp. 3270 - 3280
• Main Authors: Karthik, G. M., Janaki Ram, G. D., Kottada, Ravi Sankar
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.12.2017; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; CRACKING; DUCTILITY; Ductility tests; EUTECTICS; FRICTION; Friction resistance; Friction stir processing; Fusion welding; GRAIN SIZE; HEAT AFFECTED ZONE; MAGNESIUM ALLOYS; Magnesium base alloys; MATERIALS SCIENCE; MELTING; Metallic Materials; Microstructure; Nanotechnology; Pretreatment; REFINING; Structural Materials; Surfaces and Interfaces; Thin Films; WELDING; Cast Magnesium Alloy AZ91D; Friction Stir Processing (FSP); HAZ Liquation Cracking; Detailed Microstructural Studies; Fusion Welding
• ISSN: 1073-5615; 1543-1916
• DOI: 10.1007/s11663-017-1100-z

In this work, a cast magnesium alloy AZ91D was friction stir processed. Detailed microstructural studies and Gleeble hot ductility tests were conducted on the as-cast and the FSPed samples to comparatively assess their heat-affected zone liquation cracking behavior. The results show that the use of FSP as a pretreatment to fusion welding can strikingly improve the heat-affected zone liquation cracking resistance of alloy AZ91D by reducing the amount and size of the low-melting eutectic β (Mg 17 Al 12 ) as well as by refining the matrix grain size.