TY - JOUR
T1 - On the origin of work softening of Ni3Al deformed along [001] above the peak temperature
AU - Rentenberger, Christian
AU - Karnthaler, Hans-Peter
N1 - DOI: 10.1016/S0921-5093(01)01022-X
Affiliations: Institute of Materials Physics, University of Vienna, Boltzmanngasse 5, Vienna A-1090, Austria
Adressen: Rentenberger, C.; Institute of Materials Physics; University of Vienna; Boltzmanngasse 5 Vienna A-1090, Austria; email: [email protected]
Import aus Scopus: 2-s2.0-10644259939
04.12.2007: Datenanforderung 2001 (Import Sachbearbeiter)
PY - 2001
Y1 - 2001
N2 - Single crystalline specimens of Ni3Al were compressed along [001] at three different temperatures (600, 835 and 920 °C). Above the peak temperature (Tp = 800 °C), the stress-strain curves show a yield drop caused by work softening. Transmission electron microscopy (TEM) methods were used to analyse the structures of the superlattice dislocations formed at different deformation temperatures showing that the Burgers vector and glide plane do not change (‘ a111). Below Tp, screws and screw dipoles consisting of Kear-Wilsdorf (KW) locks are dominating. Above Tp, screw dipoles are not observed indicating their dynamic recovery. Above Tp, dislocations of all characters contain antiphase boundary (APB) faults that lie inclined to their glide plane. It is proposed that their motion occurs by APB fault dragging. Calculations were carried out to model the work-softening behaviour observed above Tp. It is concluded that both the yield stress and yield drop are governed by the value of the mobile dislocation density and its evolution with strain. Œ 2001 Elsevier Science B.V. All rights reserved.
AB - Single crystalline specimens of Ni3Al were compressed along [001] at three different temperatures (600, 835 and 920 °C). Above the peak temperature (Tp = 800 °C), the stress-strain curves show a yield drop caused by work softening. Transmission electron microscopy (TEM) methods were used to analyse the structures of the superlattice dislocations formed at different deformation temperatures showing that the Burgers vector and glide plane do not change (‘ a111). Below Tp, screws and screw dipoles consisting of Kear-Wilsdorf (KW) locks are dominating. Above Tp, screw dipoles are not observed indicating their dynamic recovery. Above Tp, dislocations of all characters contain antiphase boundary (APB) faults that lie inclined to their glide plane. It is proposed that their motion occurs by APB fault dragging. Calculations were carried out to model the work-softening behaviour observed above Tp. It is concluded that both the yield stress and yield drop are governed by the value of the mobile dislocation density and its evolution with strain. Œ 2001 Elsevier Science B.V. All rights reserved.
U2 - 10.1016/S0921-5093(01)01022-X
DO - 10.1016/S0921-5093(01)01022-X
M3 - Article
SN - 0921-5093
VL - 319-321
SP - 347
EP - 351
JO - Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing
JF - Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing
ER -