The influence of microstructure on the martensitic transformation in Cu-Zn-Al melt-spun ribbons

The martensitic transformation was investigated in a set of twin roller melt-spun Cu-Zn-Al shape memory alloys, solidified at tangential wheel speeds between 20 and 40 m/s. The resulting microstructures were analyzed using X-ray diffraction, optical and transmission electron microscopy techniques. T...

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Bibliographic Details
Published in:Philosophical magazine (Abingdon, England) England), 2010-07, Vol.90 (20), p.2793-2805
Main Authors: Pelegrina, J.L., Fabietti, L.M., Condó, A.M., Pozo López, G., Urreta, S.E.
Format: Article
Language:English
Subjects:
Antiphase boundaries
antiphase boundary
BOUNDARIES
BRASSES
COPPER ZINC ALLOYS
Cross-disciplinary physics: materials science
rheology
Diffraction
Exact sciences and technology
grain size
martensitic transformation
MARTENSITIC TRANSFORMATIONS
Materials science
MATHEMATICAL ANALYSIS
Melt spinning
Microstructure
MICROSTRUCTURES
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
PHASE TRANSFORMATIONS
Physics
rapid solidification
Ribbons
Rollers
shape memory alloy
SPINNING
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Summary:The martensitic transformation was investigated in a set of twin roller melt-spun Cu-Zn-Al shape memory alloys, solidified at tangential wheel speeds between 20 and 40 m/s. The resulting microstructures were analyzed using X-ray diffraction, optical and transmission electron microscopy techniques. The characteristic martensitic transformation temperature, M S , was determined for each condition by conventional resistometric methods. The ribbons are homogeneous in shape and for each quenching rate they exhibit a quite uniform M S temperature. By proper thermal treatments, the different factors affecting M S could be separately examined and from temperature measurements, the contribution of L2 1 antiphase boundaries evaluated. A calculation of this contribution using pair interchange energies is in good agreement with the experimental results.
ISSN:1478-6435
1478-6443
DOI:10.1080/14786431003745401