Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 755, Issue -, Pages 278-288Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2019.04.013
Keywords
ShAPE; Friction extrusion; Friction stir extrusion; Friction stir back extrusion; Magnesium; Grain refinement
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Funding
- U.S. Department of Energy Vehicle Technologies Office (DOE/VTO)
- MS3 (Materials Synthesis and Simulation Across Scales) Initiative at Pacific Northwest National Laboratory
- United States Department of Energy [DE-AC06-76LO1830]
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ZK60 Magnesium tubing has been friction extruded from as-cast billets and T5 conditioned bars using Shear Assisted Processing and Extrusion (ShAPE). Tubes having an outer diameter of 50.8 mm and wall thickness of 1.9 mm were extruded with > 20 times less ram force compared to conventional extrusion due to the unique shearing conditions and tooling inherent to ShAPE. Microstructures of the as-cast billet and T5 bar feedstock materials were significantly different from each other in terms of grain size, texture, and second phase distribution; yet the resulting microstructures after ShAPE were remarkably similar. An average grain size of 4-5 mu m, 20 degrees tilt of basal texture away from the extrusion axis, and refined second phases having a uniform distribution were achieved independent of the feedstock material. Hardness for as-extruded and artificially aged tubes are presented with isotropic behavior explained by detailed microstructural analysis. This work suggests that bulk ZK60 magnesium alloys extrusions may be fabricated in a single step, with microstructures that are unobtainable with conventional extrusion.
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