Effects of stoichiometry, microalloying and aging heat treatments on the compressive behavior of NiAl alloys

Journal Article · Sun Jun 15 04:00:00 EDT 1997 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(97)00040-7· OSTI ID:509215

Golberg, D ^[1]; Sauthoff, G ^[2]

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1. National Research Inst. for Metals, Tsukuba, Ibaraki (Japan)
2. Max-Planck-Inst fuer Eisenforschung, Duesseldorf (Germany)

The compressive properties of NiAl were found to be a sensitive function of Ni-content, solid solution hardening (by microalloying) and precipitate strengthening. The Ostwald ripening of the precipitates, which supposedly consist of the impurities C, B, O, N, Si, and S together with the extra getter metals Ti, Zr, and Hf or getter traces in the NiAl matrix, results in a specific yield stress decrease during aging at 573--973 K. The total amount of the intrinsic impurities in as-produced alloys has been found to be independent of stoichiometry and microalloying with a getter. Among the extra impurities studied, C was found to change the local electron density in a much more pronounced way compared to B or Si. Static strain-aging at 573 K and strain-rate sensitivity parameters at 473 K can be interpreted adequately by taking into account the less pronounced gettering in NiAl doped with Ti, and more pronounced gettering in NiAl doped with Hf and Zr.

• OSTI ID: 509215
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 12 Vol. 36; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
ALUMINIUM ALLOYS
COMPRESSION STRENGTH
IMPURITIES
INTERMETALLIC COMPOUNDS
NICKEL ALLOYS
PRECIPITATION
SOLID SOLUTIONS
STOICHIOMETRY