Eliminating Yield Anisotropy and Enhancing Ductility in Mg Alloys by Shear Assisted Processing and Extrusion

Conference · Mon Mar 01 04:00:00 EST 2021

OSTI ID:1808506

Darsell, Jens T. ^[1]; Zhang, Dalong ^[1]; Overman, Nicole R. ^[1]; Herling, Darrell R. ^[1]; Joshi, Vineet V. ^[1]

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1. BATTELLE (PACIFIC NW LAB)

Solid phase processing techniques such as friction stir welding, Shear assisted processing and extrusion (ShAPE)/ friction extrusion and cold spray have been successfully demonstrated as promising thermomechanical methods to produce metallic materials with enhanced performance. In this study, AZ series with and without silicon, ZK60 Mg alloys in as-received forms (as-cast or as-extruded) were processed using Shear Assisted Processing and Extrusion (ShAPE). Microstructural characterization was performed using EBSD and TEM and revealed that as compared to the feedstock materials/ billets, friction extruded Mg alloys had more uniform microstructure, equiaxed grains, finer and homogeneously distributed precipitates and chemical homogeneity. It was also observed that basal planes were not oriented parallel to extrusion axis. As a result, rod products exhibited significantly reduced (in some cases eliminated) yield asymmetry and achieved enhanced ductility, which were uncommon or difficult to attain using conventional processing techniques. In addition, modified texture likely suppressed deformation twinning under compressive deformation.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1808506
• Report Number(s): PNNL-SA-156766
• Country of Publication: United States
• Language: English

Related Subjects

Shear Assisted Processing and Extrusion
SHAPE
magnesium alloys
yield asymmetry