NDLI: Positron annihilation lifetime (PAL) studies of the variations of microstructure during isochronal annealing of Cu-Zn (60/40) alloy

Content Provider	Springer Nature Link
Author	Taha, Alia S. Kahtany, ora A.
Copyright Year	2002
Abstract	The microstructure variations during isochronal annealing of the as-received and quenched Cu-Zn (60/40) alloy were studied in the temperature range from room temperature range (RT)-1173 K. The experimental information was basically obtained by means of positron annihilation lifetime spectroscopy and Vickers microhardness. The microstructure was studied by optical and scanning electron microscopy observations. The Arrhenius plot of the data produced by the analysis of the positron annihilation spectra according to the simple trapping model is valid only at certain temperatures. Two regions were selected. The first region was at lower temperatures and its activation energy was 0.55±0.02 eV, which may be attributed to the energy of vacancy formation. The second region (at higher temperatures) was characterized by an activation energy (1.23±0.03 eV) that suggested it was related to the activation energy of recrystallization in the bulk material. The analysis of positron lifetime indicated clear evidence of the existence of three-dimensional defects in addition to one-dimensional defects, thus it needs a modification to the simple trapping model to consider the inhomogeneous trapping.
Starting Page	332
Ending Page	339
Page Count	8
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	11
Issue Number	3
e-ISSN	15441024
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cu-Zn alloys phase transformation positron annihilation lifetime recrystallization three-dimensional defects Vickers microhardness Characterization and Evaluation of Materials Materials Science Tribology, Corrosion and Coatings Quality Control, Reliability, Safety and Risk Engineering Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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