Dr. Zhizhong Dong Profile

Dr. Zhizhong Dong

at NIMS

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Proceedings Article | 21 July 2004 Paper

High-corrosion-resistance Fe-Mn-Si-based alloys exhibiting nearly perfect shape memory effects

Zhizhong Dong, Setsuo Kajiwara, Takehiko Kikuchi, Norio Shinya

Proceedings Volume 5387, (2004) https://doi.org/10.1117/12.543496

KEYWORDS: Shape memory alloys, Atomic force microscopy, Transmission electron microscopy, Corrosion, Polishing, Particles, Resistance, Niobium, Temperature metrology, Photomicroscopy

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Recently our group has succeeded, by producing very small particles of NbC carbides in austenite, in improvement of shape memory effect (SME) of the low-cost conventional Fe-Mn-Si based SMAs to such an extent that the so-called "training" treatment is no longer necessary. It was also found that the shape memory properties of the Fe-Mn-Si based SMAs were further improved by pre-rolling at 870K. The present paper describes similar improvement of shape memory properties of an Fe-15Mn-5Si-9Cr-5Ni-0.5NbC (mass %) by more convenient way of pre-extension at room temperature. This alloy is high corrosion-resistant (equivalent to SUS430) as well as low cost material, which is also one of the important requisites for industry application in various fields. A nearly perfect shape recover (90%) of an initial 4% strain was achieved when the alloy was pre-extended 12% at room temperature and then aged at 1070K for 10min. The origin of this improvement of SME has been studied by atomic force microscopy (AFM) and trasmission electron microscopy (TEM). It is concluded that uniform distribution of fine martensite plates with the same variant on the primary system is the key factor to obtain a perfect shape memory recovery.

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