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Full-Text Articles in Engineering
Experimental Investigation Of Effect Of Environment Temperature On Freeze-Form Extrusion Fabrication, Xiyue Zhao, Michael S. Mason, Tieshu Huang, Ming-Chuan Leu, Robert G. Landers, Greg Hilmas, Samuel J. Easley, Michael W. Hayes
Experimental Investigation Of Effect Of Environment Temperature On Freeze-Form Extrusion Fabrication, Xiyue Zhao, Michael S. Mason, Tieshu Huang, Ming-Chuan Leu, Robert G. Landers, Greg Hilmas, Samuel J. Easley, Michael W. Hayes
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Freeze-form Extrusion Fabrication (FEF) is an additive manufacturing technique that extrudes ceramic loaded aqueous pastes layer by layer below the paste freezing temperature for component fabrication. A computer controlled 3-D gantry system has been developed for the FEF process. The system includes a temperature control subsystem that allows for fabrication of components below the paste freezing temperature. The low temperature environment allows for larger component fabrication. Comparisons in terms of layer thickness, self-sustaining ability, and system response were performed between 0⁰C and -20⁰C for alumina sample fabrications. The minimum deposition angles without use of support material have been determined for …
Grain Size, Misorientation, And Texture Evolution Of Copper Processed By Equal Channel Angular Extrusion And The Validity Of The Hall-Petch Relationship, Florian H. Dalla Torre, Azdiar A. Gazder, Cheng F. Gu, Christopher H.J. Davies, E V. Pereloma
Grain Size, Misorientation, And Texture Evolution Of Copper Processed By Equal Channel Angular Extrusion And The Validity Of The Hall-Petch Relationship, Florian H. Dalla Torre, Azdiar A. Gazder, Cheng F. Gu, Christopher H.J. Davies, E V. Pereloma
Faculty of Engineering - Papers (Archive)
The microstructure and texture of copper subjected to equal channel angular extrusion (ECAE) via route B C for up to 16 passes have been assessed using electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), X-ray diffraction (XRD) peak broadening, and texture analysis. The differences in grain size measured by these techniques allows for an understanding of microstructural evolution. A gradual decrease in grain size occurs with an increasing number of passes, while the subgrain size remains approximately constant. Up to four passes, the fraction of high-angle grain boundaries (HAGBs) (>15 deg) increases from 15 to 45 pct, but remains …