Kim, H.J. Jee, K.K. Kang, H.W. Lee, J.K. Yang, G.S. Jang, W.Y. 2024-01-12T06:56:36Z 2024-01-12T06:56:36Z 2022-03-07 2012-02 1022-6680 https://pubs.kist.re.kr/handle/201004/80424 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. ？ (2012) Trans Tech Publications. English ICKEM Effect of grain size on the shape recovery in a melt-spun Fe-24%Mn-4%Si-5%Cr-5%Co SMA ribbon Conference 10.4028/www.scientific.net/AMR.488-489.315 1 2012 2nd International Conference on Key Engineering Materials, ICKEM 2012, pp.315 - 320 2012 2nd International Conference on Key Engineering Materials, ICKEM 2012 315 320 SZ Singapore 2012-02-26 Advanced Materials Research 2-s2.0-84859028742