The influence of C and Si on the flow behavior of NiAl single crystals

Journal Article · Fri Mar 15 04:00:00 EST 1996 · Scripta Materialia

DOI:https://doi.org/10.1016/1359-6462(95)00590-0· OSTI ID:215371

Weaver, M L ^[1]; Noebe, R D ^[2]; Kaufman, M J ^[3]

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1. Florida A and M Univ., Tallahassee, FL (United States). Center for Nonlinear and Nonequilibrium Aeroscience
2. NASA Lewis Research Center, Cleveland, OH (United States)
3. Univ. of Florida, Gainesville, FL (United States). Dept. of Materials Science and Engineering

Alloys based on the intermetallic compound NiAl are considered potential replacements for Ni and Co-based superalloys in high temperature structural applications due to their excellent oxidation resistance, low densities, high thermal conductivities, and increased melting points. Unfortunately, NiAl exhibits low tensile ductility at room temperature and low strengths at elevated temperatures which have combined to hinder its development. The purpose of the present paper is to provide a preliminary assessment of the influence of common substitutional and interstitial impurities on the deformation behavior of NiAl. To accomplish this goal a series of NiAl single crystal alloys containing various interstitial solutes were prepared and their mechanical properties were evaluated between 77 and 1,100 K. Because Si is a common impurity in conventional purity single crystals grown by the Bridgman method, Si concentrations were also varied in order to determine the influence of this element.

• OSTI ID: 215371
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 6 Vol. 34; ISSN 1359-6462; ISSN XZ503X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
DEFORMATION
ELONGATION
FLOW STRESS
IMPURITIES
INTERMETALLIC COMPOUNDS
INTERSTITIALS
MECHANICAL PROPERTIES
NICKEL ALLOYS
STOICHIOMETRY
STRAIN AGING
STRAIN HARDENING
STRAIN RATE
STRESSES
YIELD STRENGTH