X-ray and microstructural investigation of NiTiPt alloys homogenised at intermediate to high temperatures

L. O'Donoghue, A. A. Gandhi, J. Butler, W. Redington, P. Tiernan, T. McGloughlin, J. C. Carlson, S. Lavelle, S. A.M. Tofail

Research output: Contribution to journalArticlepeer-review

Abstract

The structural evolution of a Ni-rich NiTiPt alloy (Ni50Ti42.5Pt7.5) is studied here as a function of homogenisation temperature. The biphasic microstructure of the as-cast Ni50Ti42.5Pt7.5 alloy consisted of a high-Pt lath type structure that was dispersed in a martensitic NiTiPt matrix. Homogenisation of the as-cast structure at intermediate temperatures (825-925 °C) resulted in the redistribution of the dendritic second phase into a faceted structure. The hardness of the alloy decreased with increasing temperatures within this intermediate homogenisation temperature range due to breaking of the as-cast structure. Homogenisation of the alloys at higher temperatures e.g. 1100 and 1200 °C, resulted in the reformation of a lathed structure with an associated precipitation hardening due to the due to the formation of fine Ni-rich precipitates.

Original languageEnglish
Pages (from-to)287-290
Number of pages4
JournalNuclear Inst. and Methods in Physics Research, B
Volume268
Issue number3-4
DOIs
Publication statusPublished - Feb 2010

Keywords

  • DTA
  • Hardness
  • Microstructure
  • Nitinol
  • NiTiPt
  • XRD

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