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Metallurgical and shape memory characteristics of grain-refined Cu-Zn-Al shape memory alloys
Published in
2002
Volume: 5062
   
Issue: 2
Pages: 899 - 905
Abstract
Copper-based shape memory alloys (SMAs) are prone for grain growth during thermomechanical and betatising treatments. The grain growth of the alloy leads to intergranular cracking on quenching to form martensite in the alloy, which in turn leads to poor mechanical properties including corrosion resistance of the alloy. In the present work, grain refinement of a CuZnAl shape memory alloy was done by adding 0.2 to 0.4 wt.% of zirconium, titanium and boron as grain refiners. The effect of these additions on the microstructure and shape memory properties of the alloys were studied. The results show that the Zr and Ti additions reduce the grain size from 1.5 mm to 200 μm and 500 μm respectively. The Zr-added alloy shows good strain recovery and corrosion resistance compared with the alloy in the other conditions.
About the journal
JournalProceedings of SPIE - The International Society for Optical Engineering
Open AccessNo
Concepts (16)
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    Copper alloys
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    Corrosion resistance
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    Crack initiation
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    ELASTICITY
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    Grain growth
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    Grain size and shape
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    Martensite
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    Metallographic microstructure
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    Strain
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    Thermomechanical treatment
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    COPPER ZINC ALUMINUM SHAPE MEMORY ALLOYS
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    Grain refinement
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    Pseudoelasticity
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    SHAPE MEMORY PROPERTIES
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    Superelasticity
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    Shape memory effect