Paper Title:
Phase Diagram and Precipitation Behaviour in Ni-Rich Region of Ni-Ta-Al Ternary System
  Abstract

Tantalum (Ta) addition is one of the promising method for increasing the strength of Ni-based wrought alloys such as Inconel 718, because Ta is an element having a high melting temperature. For wrought alloys, it is necessary to make clear the phase relationships at 700~1000°C, but there is a few report on phase diagrams of Ni-Ta and Ni-Ta-Al systems at those temperatures. In this study, the phase diagram in Ni-rich region of Ni-Ta-Al system at 800°C, which is the important temperature for the practical use of the wrought alloys, was investigated. The equilibrium relations of each phase were examined by a conventional XRD, SEM/EDX and TEM observations. It was found that the γ-phase region expanded considerably towards Ta-rich compositional region in Ni-Ta-Al system at 800°C. Also, it was observed that the γ phase precipitated secondarily in the primary precipitated γ’ phase in Ni-10.5mol%Ta-5.5mol%Al alloy. Ni8Ta phase was not detected even in Ni-Ta binary system in this study, although this phase was reported previously.

  Info
Periodical
Materials Science Forum (Volumes 561-565)
Main Theme
Edited by
Young Won Chang, Nack J. Kim and Chong Soo Lee
Pages
2329-2332
DOI
10.4028/www.scientific.net/MSF.561-565.2329
Citation
Y. Tsukada, K. Hasuike, Y. Murata, M. Morinaga , "Phase Diagram and Precipitation Behaviour in Ni-Rich Region of Ni-Ta-Al Ternary System", Materials Science Forum, Vols. 561-565, pp. 2329-2332, 2007
Online since
October 2007
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