A nano lamella NbTi-NiTi composite with high strength

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Jiang Jiang
  • Daqiang Jiang
  • Shijie Hao
  • Cun Yu
  • Junsong Zhang
  • Deping Lu
  • Shifang Xie
  • Lishan Cui

Detail(s)

Original languageEnglish
Pages (from-to)121-124
Journal / PublicationMaterials Science and Engineering A
Volume633
Publication statusPublished - 1 May 2015
Externally publishedYes

Abstract

A hypereutectic Nb60Ti24Ni16 (at%) alloy was prepared by vacuum induction melting, and a nano lamellae NbTi-NiTi composite was obtained by hot-forging and wire-drawing of the ingot. Microscopic analysis showed that NbTi and NiTi nano lamellae distributed alternatively in the composite, and aligned along the wire axial direction, with a high volume fraction (~70%) of NbTi nano lamellae. In situ synchrotron X-ray diffraction analysis revealed that stress induced martensitic transformation occurred upon loading, which would effectively weaken the stress concentration at the interface and avoid the introduction of defects into the nano reinforced phase. Then the embedded NbTi nano lamellae exhibited a high elastic strain up to 2.72%, 1.5 times as high as that of the Nb nanowires embedded in a conventional plastic matrix, and the corresponding stress carried by NbTi was evaluated as 2.53GPa. The high volume fraction of NbTi nano lamellae improved the translation of high strength from the nano reinforced phase into bulk properties of the composite, with a platform stress of ~1.7GPa and a fracture strength of ~1.9GPa.

Research Area(s)

  • In situ synchrotron X-ray diffraction, Martensitic transformation, Nano lamellae composite, NiTi, Shape memory alloy (SMA)

Bibliographic Note

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Citation Format(s)

A nano lamella NbTi-NiTi composite with high strength. / Jiang, Jiang; Jiang, Daqiang; Hao, Shijie et al.
In: Materials Science and Engineering A, Vol. 633, 01.05.2015, p. 121-124.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review