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Effect of thermal processing on microstructure and shape-memory characteristics of a copper-zinc-aluminum shape-memory alloy
Published in
2007
Volume: 22
   
Issue: 1
Pages: 9 - 14
Abstract
Although Cu-based shape-memory alloys possess higher transformation temperatures compared with Ni-Ti shape-memory alloys and a higher magnitude of strain recovery, they are still not used extensively in commercial applications since they suffer from some inherent drawbacks, such as a lack of ductility and stabilization of martensite. Cu-Zn-Al alloys in particular are more prone to stabilization. In the present work, therefore, a Cu-Zn-Al alloy with a low Al content (<3 wt%) prepared by ingot metallurgy was thermally processed by subjecting it to different quenching treatments, such as direct quenching, up-quenching and step-quenching using water, oil and brine solution as the quenchants. The effect of different methods of quenching as well as the quenchants themselves on the microstructure, transformation temperatures and shape-memory characteristics of the alloy was investigated and the results obtained have been interpreted. The study reveals that quenching in a brine solution results in 100% martensite, thereby getting rid of the deleterious effects of aging. The characteristic transformation temperatures are also modified by variations in the rate of quenching.
About the journal
JournalMaterials and Manufacturing Processes
ISSN10426914
Open AccessNo
Concepts (12)
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    Aging of materials
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    Copper alloys
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    Heat treatment
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    Martensitic transformations
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    Microstructure
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    Quenching
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    Stabilization
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    Thermal effects
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    QUENCHANTS
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    THERMAL PROCESSING
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    TRANSFORMATION TEMPERATURES
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    Shape memory effect