Blum, W. ; Eisenlohr, P. ; Prell, M. ; Durst, Karsten (2015)
Thermally activated flow in soft and hard regions: Getting information on work hardening strain and recovery strain from rate change tests.
In: KOVOVE MATERIALY-METALLIC MATERIALS, 53 (4)
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The investigation of thermally activated glide processes by stress reduction tests is reviewed. The tests reveal that two mechanisms of inelastic deformation are superimposed, namely dislocation glide connected with work hardening by defect storage and recovery strain related with relaxation of internal stresses and defect recovery. The coupling of the two is proposed to be modeled within the composite model. A new kind of transient testing is proposed that combines the conventional rate change test with an intermediate stress reduction. Its application to nanocrystalline Ni shows similarity of the main parameters of thermally activated dislocation glide and recovery strain found for conventional pure single and polycrystals: spacings of thermal obstacles in units of free dislocation spacing approximate to 1, back flow starting after approximate to 20 % stress reduction, similar magnitude of relative contribution and stress dependence of recovery strain.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2015 |
| Autor(en): | Blum, W. ; Eisenlohr, P. ; Prell, M. ; Durst, Karsten |
| Art des Eintrags: | Bibliographie |
| Titel: | Thermally activated flow in soft and hard regions: Getting information on work hardening strain and recovery strain from rate change tests |
| Sprache: | Englisch |
| Publikationsjahr: | 2015 |
| Verlag: | REDAKCIA KOVOVE MATERIALY, Slovakia |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | KOVOVE MATERIALY-METALLIC MATERIALS |
| Jahrgang/Volume einer Zeitschrift: | 53 |
| (Heft-)Nummer: | 4 |
| Kurzbeschreibung (Abstract): | The investigation of thermally activated glide processes by stress reduction tests is reviewed. The tests reveal that two mechanisms of inelastic deformation are superimposed, namely dislocation glide connected with work hardening by defect storage and recovery strain related with relaxation of internal stresses and defect recovery. The coupling of the two is proposed to be modeled within the composite model. A new kind of transient testing is proposed that combines the conventional rate change test with an intermediate stress reduction. Its application to nanocrystalline Ni shows similarity of the main parameters of thermally activated dislocation glide and recovery strain found for conventional pure single and polycrystals: spacings of thermal obstacles in units of free dislocation spacing approximate to 1, back flow starting after approximate to 20 % stress reduction, similar magnitude of relative contribution and stress dependence of recovery strain. |
| Freie Schlagworte: | thermally activated flow, activation area, composite model, subgrain boundaries, dislocations, recovery |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Physikalische Metallkunde 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 25 Jan 2016 11:38 |
| Letzte Änderung: | 25 Jan 2016 11:38 |
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