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Harper-dorn creep in pure metals

AuthorsRuano, Oscar Antonio; Wadsworth, J.; Sherby, O. D.
KeywordsDislocation creep process
Harper-Dorn creep
Model predicts
Issue Date1988
CitationActa Metallurgica 36(4) : 1117-1128 (1988)
AbstractEvidence is presented that Harper-Dora (H-D) viscous creep is a diffusion-controlled, dislocation creep process. The factors influencing H-D creep are the same as those influencing power-law creep, namely dislocation density, subgrain or grain size, stacking fault energy, and elastic modulus. H-D creep has been observed, and is analyzed, for seven different metals: Al, Pb, Sn, α-Zr, α-Ti, α-Fe, and β-Co. In addition, seven metals (α-Fe, Ni, Ag, β-Co, Cu, Mo, and Cr) which were originally believed to be controlled by diffusional (Nabarro-Herring) creep at low stresses, are shown to be controlled by Harper-Dorn creep. An internal stress assisted creep model is presented which correlates data in both the power-law and H-D creep regimes. The model predicts, quantitatively, the conditions under which H-D creep will dominate plastic flow.
Publisher version (URL)http://dx.doi.org/10.1016/0001-6160(88)90165-4
Appears in Collections:(CENIM) Artículos
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