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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Cast Shop Technology
Presentation Title Microstructural modification of a high-pressure die-cast A380 alloy through friction stir processing and its effect on mechanical properties
Author(s) Avik Samanta, Hrishikesh Das, David Garcia, Robert J. Seffens, Timothy J. Roosendaal, Anthony Guzman, Glenn J. Grant, Saumyadeep Jana
On-Site Speaker (Planned) Avik Samanta
Abstract Scope Aluminum alloy A380 is one of the major high-pressure die-cast (HPDC) alloys fabricated in the die casting sector. However, microstructural features such as shrinkage and gas porosity, entrapped oxide inclusions, change in the morphology of eutectic Si particles as a function of casting location, and the presence of multiple second phase particulates, especially Fe-bearing phases in HPDC A380 alloy results in limited ductility, thus, affecting its structural application. However, through proper modification of the as-cast microstructure, it is possible to improve the mechanical performance of alloy A380. In this study, we report the effect of friction stir processing (FSP), a well-known severe plastic deformation (SPD) and thermomechanical processing tool for selective microstructural modification, on A380. FSP effectively refines the as-cast microstructure and breaks down the coarse Si particles, creating a homogenized distribution of equiaxed Si particles in the aluminum matrix. Additionally, FSP eliminates porosity that acts as crack initiation sites, leading to improved mechanical strength and ductility.
Proceedings Inclusion? Planned: Light Metals


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