Finite-Element Modeling of Titanium Powder Densification |
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Authors: | Bing Ye Marc R Matsen David C Dunand |
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Affiliation: | (1) Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA;(2) Boeing Research and Technology, The Boeing Company, Seattle, WA 98124, USA; |
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Abstract: | A powder-level, finite-element model is created to describe densification, as a function of applied stress during uniaxial
hot pressing, of CP-Ti and Ti-6Al-4V powders with spherical or spheroidal shapes for various packing geometries. Two cases
are considered: (1) isothermal densification (in the α- or β-fields of CP-Ti and in the β-field of Ti-6Al-4V) where power-law creep dominates and (2) thermal cycling densification (across the α/β-phase transformation of Ti-6Al-4V) where transformation mismatch plasticity controls deformation at low stresses. Reasonable
agreement is achieved between numerical results and previously published experimental measurements and continuum modeling
predictions. |
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