In situ X-ray diffraction study of deformation behavior in a Fe/NiTi composite

A Fe/NiTi composite wire fabricated by simple mechanical processing exhibits a singular deformation feature of strain recovery ratio increase with increasing tensile strain, which is diametrically opposite to that of conventional metal materials. Furthermore, the composite possesses a recoverable st...

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Veröffentlicht in:Applied Physics Letters 2012-11, Vol.101 (22)
Hauptverfasser: Hao, Shijie, Cui, Lishan, Shao, Yang, Jiang, Jiang, Jiang, Daqiang, Wang, Shan, Du, Minshu, Wang, Yandong, Brown, Dennis E., Ren, Yang
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Sprache:eng
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Zusammenfassung:A Fe/NiTi composite wire fabricated by simple mechanical processing exhibits a singular deformation feature of strain recovery ratio increase with increasing tensile strain, which is diametrically opposite to that of conventional metal materials. Furthermore, the composite possesses a recoverable strain of over 7% and a higher mechanical damping capability than that of the well-known high damping NiTi shape memory alloy. In-situ synchrotron X-ray diffraction reveals that these extraordinary features originate from the strong interaction between the soft Fe core and the superelastic NiTi tube during tensile cycling. This study offers in-depth understanding of the deformation behavior of the composites composed of soft metal and superelastic shape memory alloy.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4767993