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Journal of Materials Science

, Volume 43, Issue 17, pp 5905–5923 | Cite as

Combustion synthesis/quasi-isostatic pressing of TiC0.7–NiTi cermets: microstructure and transformation characteristics

  • E. R. Strutt
  • T. Radetic
  • E. A. Olevsky
  • M. A. MeyersEmail author
Article

Abstract

TiC0.7–NiTi cermets were produced by combustion synthesis followed by quasi-isostatic consolidation while the reaction products were still hot and ductile. The TiC0.7–NiTi cermets were characterized by differential scanning calorimetry, room temperature transmission electron microscopy (TEM), and in-situ TEM (temperature varied during observation). The matrix of the as-synthesized 20NiTi, 40NiTi, and 60NiTi composites contains both R and B19′ martensites at room temperature. No distinct R-phase morphology could be imaged. In the B19′ martensite, [011] Type II twinning, \( (11\bar 1) \) Type I twinning and (001) compound twinning modes were observed as the lattice invariant shear (LIS) of the R-B19′ transformation. The [011] Type II twinning is often reported as the LIS of the B2-B19′ transformation, but this is the first experimental confirmation of its predicted presence as a qualified LIS of the R-B19′ transformation. The (001) compound twinning mode is responsible for the fine structure of the martensite with a wavy morphology. Nanoscale structures with a thickness of 5 nm were obtained inside the twins. Twinning was also observed at the interface with carbide particles, which confirms that some stress relaxation of the elastic mismatch occurs. At room temperature, the matrix of the 80NiTi composite had the R-phase structure, which appeared with a needle-like morphology. Thermal cycling resulted in the suppression of the R-phase transformation. This is the opposite of the behavior observed in un-reinforced NiTi alloys.

Keywords

Martensite Differential Scanning Calorimetry Curve Carbide Particle Dark Field Image Select Area Diffraction Pattern 

Notes

Acknowledgement

This research was supported by the Director, Office of Science, Office of Basic Energy Sciences of the US Department of Energy under contract No. DE-AC03-76SF00098.

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • E. R. Strutt
    • 1
  • T. Radetic
    • 2
  • E. A. Olevsky
    • 3
  • M. A. Meyers
    • 1
    Email author
  1. 1.Materials Science and Engineering Program, Departments of Mechanical and Aerospace Engineering and NanoengineeringUniversity of California, San DiegoLa JollaUSA
  2. 2.National Center for Electron Microscopy, Lawrence Berkeley National LaboratoryUniversity of CaliforniaBerkeleyUSA
  3. 3.Department of Mechanical EngineeringSan Diego State UniversitySan DiegoUSA

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