Effect of Grain Size on the Shape Recovery in a Melt-spun Fe-24%Mn-4%Si-5%Cr-5%Co SMA Ribbon

Title
Effect of Grain Size on the Shape Recovery in a Melt-spun Fe-24%Mn-4%Si-5%Cr-5%Co SMA Ribbon
Authors
김형준지광구강후원이종국양권승장우양
Keywords
Fe-Mn-Si based alloy; Melt-spun ribbon; Grain size; Microstructure; Shape recovery
Issue Date
2012-03
Publisher
Advanced materials research
Citation
VOL 488-489, 315-320
Abstract
Effect of grain size on microstructure, transformation characteristics and shape recovery has been studied in Fe-24%Mn-4%Si-5%Cr-5%Co shape memory ribbons fabricated by melt spinning. Mean grain size of the ribbons could be controlled by wheel speed; in case of ribbon manufactured in the wheel speed of 10 m/sec, mean grain size was more or less 20 μm, while the mean grain size in 50 m/sec was about 1 μm. Thermal ε-martensite in the shape of plate could be observed in austenite matrix and the volume fraction of that decreased in smaller grains because of grain constraint. As a grain size decreased, one-way and two-way shape recoveries were increased. A change in shape recovery of ribbons was closely related to deformation mode i.e., transformation-induced plasticity or slip according to grain size; it could be confirmed that reversible ε-martensite was induced in preference to irreversible slip in the ribbon with smaller grains during deformation by X-ray diffractometry. Not like in bulk specimen, ε-martensite being very thin in the width of 10 ~ 20 nm and lots of stacking faults being inferred from streaks of SAD patterns, were revealed in melt-spun ribbons manufactured in the wheel speed of 50 m/sec.
URI
http://pubs.kist.re.kr/handle/201004/42190
ISSN
10226680
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KIST Publication > Article
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