Synthesis and Microstructure Investigation of Ni40Ti50Cu10 Intermetallic Shape Memory Alloys by Self-Propagating Combustion Method


Keskin B., Bassani P., BAKAN F., SEZEN M., Derin B.

TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS, vol.75, no.11, pp.2749-2758, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 75 Issue: 11
  • Publication Date: 2022
  • Doi Number: 10.1007/s12666-022-02657-8
  • Journal Name: TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Aerospace Database, Communication Abstracts, INSPEC, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.2749-2758
  • Keywords: Shape memory alloy, NiTiCu, Factsage, Characterization, SHS, HIGH-TEMPERATURE SYNTHESIS, MARTENSITIC-TRANSFORMATION, MECHANISM
  • Istanbul Technical University Affiliated: Yes

Abstract

This study concerns the substitution of copper for nickel in the Ni-Ti system in order to obtain a molar ratio of Ni40Ti50Cu10. Effects of preheating temperature were studied to understand the morphology, phase transformation, and microstructure of the samples by using self-propagating high-temperature synthesis. Therefore, three distinct preheating temperatures (230 degrees C, 320 degrees C, and 410 degrees C) were used for the study. The thermochemical calculations performed with FactS age presented similar results with the experimental data in terms of solid-liquid ratios and adiabatic temperature during the reactions. An increase in the preheating temperature very slightly changed the transformation temperature, but it was shown to be insignificant. B2 crystal structure was found as the main phase besides a small amount of martensite, Ti2Ni(Cu), and Ni(Cu)(2)Ti-Ni(Cu)(3)Ti by various characterization methods. The monoclinic twinned martensitic (B19') structure was encountered in transmission electron microscopy analyses.