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Defect Recovery and Ordering in Ni3A1+B

Published online by Cambridge University Press:  22 February 2011

H. P. Karnthaler ,
R. Kozubski ,
W. Pfeiler  and
C. Rentenberger
H. P. Karnthaler
Affiliation:
Institut für Festkörperphysik, University of Vienna, Strudlhofgasse 4, A-1090 Vienna, Austria
R. Kozubski
Affiliation:
on leave from Institute of Physics, Jagellonian University, Reymonta 4, 30–059 Krakow, Poland
W. Pfeiler
Affiliation:
Institut für Festkörperphysik, University of Vienna, Strudlhofgasse 4, A-1090 Vienna, Austria
C. Rentenberger
Affiliation:
Institut für Festkörperphysik, University of Vienna, Strudlhofgasse 4, A-1090 Vienna, Austria
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Abstract

Defect recovery and long-range ordering (LRO) in Ni76Al24+0.19at.%B (400 wt.ppm) were studied by means of residual resistometry, TEM methods and microhardness testing. The material was cold-rolled with intermediate annealings and the samples were prepared from sheets exhibiting effective thickness reductions of 8 and 14%, respectively, achieved in the final rolling step.

By TEM two recovery processes were observed. Firstly, superlattice intrinsic stacking faults (SISF) of large density recovered almost completely in the temperature regime between 443 and 700 K showing that they are bounded by dislocations of opposite sign. This indicates that most of the SISF are formed by pulling out dipoles and not by dislocation interactions as recently suggested. Secondly, the recovery of antiphase-boundary (APB) dissociated superlattice dislocations occurred by the annihilation of dipoles within the whole temperature regime leading finally to a loss of all dislocations at 1273 K.

Despite some excess disorder caused by cold-rolling, the mechanical deformation did not influence qualitatively the LRO processes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 309
Copyright
Copyright © Materials Research Society 1995

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