Large strain deformation of polycrystalline metals at low homologous temperatures |
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Authors: | J.E. Hockett O.D. Sherby |
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Affiliation: | Los Alamos Scientific Laboratory of the University of California, Los Alamos, New Mexico 87544, U.S.A.;Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, U.S.A. |
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Abstract: | Large strain compression data (true strains to about ?3.0) are presented for polycrystalline α U and α Fe at room temperature. The results, together with other published data at low homologous temperatures (≈0.2 Tm), where Tm is the absolute melting temperature, suggest that a steady-state flow stress σs is approached after extensive strain-hardening, α U exhibits a very high strain-hardening rate, with σs ≈ 2900 MPa (420 ksi) indicating that cold-working is a very potent method of strengthening this metal. All the data evaluated can be fit by the stress-strain relation σ = σs? exp (?(Nε)p)(σs? σy), where σy is the yield stess, p is a constant equal to a for the metals analyzed, N is a constant associated with the strain-hardening characteristics of a material, σ is true stress, and ε is true strain. |
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