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Metallurgical and Materials Transactions A

, Volume 46, Issue 12, pp 5887–5899 | Cite as

An In Situ Study of Sintering Behavior and Phase Transformation Kinetics in NiTi Using Neutron Diffraction

  • Gang Chen
  • Klaus-Dieter Liss
  • Peng Cao
Article

Abstract

The powder sintering behavior of NiTi from an elemental powder mixture of Ni/Ti has been investigated, using an in situ neutron diffraction technique. In the sintered alloys, the overall porosity ranges from 9.2 to 15.6 pct, while the open-to-overall porosity ratio is between 8.3 and 63.7 pct and largely depends on the sintering temperature. In comparison to powder compacts sintered at 1223 K and 1373 K (950 °C and 1100 °C), the powder compact sintered at 1153 K (880 °C) shows a much smaller pore size, a higher open-to-overall porosity ratio but smaller shrinkage and a lower density. Direct evidence of eutectoid transformation in the binary Ni-Ti system during furnace cooling to ca. 890 K (617 °C) is provided by in situ neutron diffraction. The intensities of the B2-NiTi reflections decrease during the holding stage at 1373 K (1100 °C), which has been elaborated as an extinction effect according to the dynamical theory of neutron diffraction, when distorted crystallites gradually recover to perfect crystals. The analysis on the first five reflections clarifies the non-existence of any order–disorder transition in the NiTi phase from B2-to-BCC structure.

Keywords

Neutron Diffraction Ni3Ti NiTi Alloy Superlattice Reflection Disorder Transition 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We thank the financial support from Ministry of Business Innovation and Employment (MBIE), New Zealand. Gang Chen acknowledges the China Scholarship Council (CSC) for providing his doctoral scholarship. We also appreciate the support of the Bragg Institute, Australian Nuclear Science and Technology Organisation (ANSTO) and Australian Institute of Nuclear Science and Engineering (AINSE) Ltd for providing the beamtime and financial assistance (Award No.: P2716) for the neutron diffraction work conducted on the WOMBAT instrument. We also appreciate the funding from Shaanxi Science and Technology Co-ordination and Innovation Project (No.: 2014KTZB01-02-04).

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2015

Authors and Affiliations

  1. 1.Department of Chemical and Materials EngineeringThe University of AucklandAucklandNew Zealand
  2. 2.State Key Laboratory of Porous Metal MaterialsNorthwest Institute for Nonferrous Metal ResearchXi’anP.R. China
  3. 3.Australian Nuclear Science and Technology OrganisationLucas HeightsAustralia
  4. 4.Quantum Beam Science DirectorateJapan Atomic Energy AgencyNaka-gunJapan

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