High-temperature strength of Ni-doped IrAl with the B2 type ordered crystal structure

A. Chiba, T. Ono, X. G. Li, S. Takahashi

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Constant-velocity and constant-load compression tests have been conducted to examine the mechanical behavior of polycrystalline Ir1-xNixAl intermetallic compounds with x = 0 to 1·0 at elevated temperatures. Ductility of Ir1-xNixAl is improved with increasing x, while the strength decreases with increasing x in the intermediate temperature range. The specific strength of Ir1-xNixAl is almost independent of x at temperatures higher than approximately 1473 K. Secondary creep of IrAl and Ir0·2Ni0·8Al (i.e. modified NiAl) exhibits class II and class I behavior, respectively. Creep strength of Ir1-xNixAl is about a magnitude of four higher than that of single-phase and multi-phase NiAl at a given applied stress. The Ir1-xNixAl intermetallic compound is superior to binary IrAl as a high-temperature structural material from the viewpoint of the specific strength, ductility and resistance to oxidation, especially at temperatures higher than 1473 K. Published by Elsevier Science Limited. All rights reserved.

Original languageEnglish
Pages (from-to)35-42
Number of pages8
JournalIntermetallics
Volume6
Issue number1
DOIs
Publication statusPublished - 1998 Feb
Externally publishedYes

Keywords

  • A. intermetallics
  • B. creep
  • G. energy system
  • Mechanical properties at high temperature
  • Nickel aluminides based on NiAl

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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