Effect of ternary additions on the intrinsic ductility of Ni3Al alloys

A. Chiba, S. Hanada, S. Watanabe

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)

Abstract

Ductility of binary and ternary Ni3Al alloys with conventional purity, fabricated by isothermal hot-forging, was examined by tensile tests in dry oxygen to eliminate environmental embrittlement. Recrystallized Ni-23Al doped with approximately 0.4 mol% X(X=Hf, Nb, and Zr) alloys exhibits pronounced ductility, whereas recrystallized Ni-23Al-2X alloys exhibits elongation of less than 3%. Ductility of a highly purified binary Ni-23Al alloy was also examined and showed remarkable ductility, resulting in transgranular fracture. This indicates that a Ni-rich Ni3Al alloy inherently exhibits marked ductility without intergranular fracture if impurity atoms and other extrinsic factors(e.g., environmental effect and internal microcracks) are eliminated in the alloy. Thus it is found that Hf, Nb and Zr in the significant ductilization of Ni-23Al can act as a scavenger of harmful impurities when added in a small amount. With further increasing amount of additions of Hf, Nb and Zr, elongation decreases rapidly and reaches almost no ductility at 2 mol% additions, indicating that Hf, Nb and Zr lower the intrinsic ductility of Ni3Al alloy.

Original languageEnglish
Pages (from-to)843-848
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume364
Issue number2
Publication statusPublished - 1995 Jan 1
Externally publishedYes
EventProceedings of the 1994 MRS Fall Meeting - Boston, MA, USA
Duration: 1994 Nov 281994 Nov 30

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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