The effect of iron, gallium and molybdenum on the room temperature tensile ductility of NiAl

Darolia, R.; Lahrman, D.F.; Field, R. D.

doi:10.1016/0956-716x(92)90221-y

Cited by 190 publications

(64 citation statements)

References 4 publications

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“…Alloying is considered to be effective to improve mechanical and chemical properties of intermetallic compounds, such as creep strength, 101,102) tensile ductility, 103,104) oxidation resistance 105) and corrosion resistance. 106) It is, however, anticipated that the addition of alloying elements may degrade the conductivity of the intermetallic compounds 107) as is the case for pure elements.…”

Section: Thermal Conductivity Of Intermetallic Compounds With Third Ementioning

confidence: 99%

Thermal Conductivity of Intermetallic Compounds with Metallic Bonding

et al. 2002

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Thermal conductivity is one of the key parameters required for high-temperature structural applications of metallic materials. In this overview, the thermal conductivity of intermetallic compounds are extensively described based mainly on our past works, since there had been less works in this research field. Emphasis is placed on the B2 and the L1 2 compounds with metallic bonding such as NiAl, Ni 3 Al, etc., which have been attracting attention for engineering applications at higher temperatures. The thermal conductivity data have been accumulated for the intermetallic compounds, and the phenomenological aspects are reviewed in detail as a function of alloy composition, constituent and temperature. The Wiedemann-Franz law is applicable to the intermetallic compounds, indicating that the carrier of thermal conduction is an electron rather than a phonon. The thermal conductivity of an intermetallic compound with the ordered crystal structure is characterized as an enhancement due to ordering with reference to the basic contribution of solid solution with the disordered crystal structure. It is demonstrated that the thermal conductivity of intermetallic compounds is reduced by the addition of a third element, and this subject is also covered.

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Section: Thermal Conductivity Of Intermetallic Compounds With Third Ementioning

confidence: 99%

Thermal Conductivity of Intermetallic Compounds with Metallic Bonding

et al. 2002

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“…It is assumed that similar effects, as already discussed by Darolia et al, 21 are responsible for the increase of the ductility due to Fe. These are first of all the interaction of Fe with interstitial impurities such as O, C, N, and S. These elements are known to have a detrimental influence on the room temperature toughness of NiAl.…”

Section: Discussionmentioning

confidence: 63%

Fracture toughness evaluation of NiAl single crystals by microcantilevers—a new continuous J-integral method

et al. 2016

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The fracture toughness of NiAl single crystals is evaluated with a new method based on the Jintegral concept. The new technique allows the measurement of continuous crack resistance curves at the microscale by continuously recording the stiffness of the microcantilevers with a nanoindenter. The experimental procedure allows the determination of the fracture toughness directly at the onset of stable crack growth. Experiments were performed on notched microcantilevers which were prepared by focused ion beam milling from NiAl single crystals. Stoichiometric NiAl crystals and NiAl crystals containing 0.14 wt% Fe were investigated in the so-called "hard" orientation. The fracture toughness was evaluated to be 6.4 6 0.5 MPa m 1/2 for the stoichiometric sample and 7.1 6 0.5 MPa m 1/2 for the iron containing sample, indicating that the addition of iron enhances the ductility. This effect is intensified with ongoing crack propagation where the Fe-containing sample exhibits a stronger crack resistance behavior than the stoichiometric NiAl single crystal. These findings are in good agreement with macroscopic fracture toughness measurements, and validate the new micromechanical testing approach.

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“…The ALCHEMI analysis of the Fe-doped NiAl alloys [26] also identifies a unique sitesubstitution behavior for an alloy that is within the composition range that Darolia et al have reported as exhibiting enhanced ductility [28]. Enhanced ductility was reported for alloys in the Al-deficient series with alloying levels in the range 0.1 I x I 0.25.…”

Section: Understanding the Properties Of Ordered Intermetallic Alloysmentioning

confidence: 65%

The role of ALCHEMI in understanding the properties of ordered intermetallic alloys

Anderson¹

1998

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RECEIVED ABSTRACT Jut 0 1 1998 O S T IAfter one and one-half decades of development, ALCHEMI is approaching the status of an established analytical technique. Many of the problems that have plagued ALCHEMI, especially for the analysis of ordered intermetallic alloys, are now well understood, and accurate site-distributions can be extracted from a variety of intermetallic alloys. This paper begins with an overview of the factors that can lead to large systematic errors or gross misinterpretations of ALCHEMI data, with illustrations from a variety of ordered intermetallic alloys. The paper concludes with a discussion of ALCHEMI in the broader context of understanding the properties of ordered intermetallic alloys. The results of systematic studies are used to illustrate the role of ALCHEMI in determining the competing effects of thermodynamic and kinetic factors during alloy processing and the correlation of alloy properties with the atomic site distributions on which the properties ultimately depend.

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The effect of iron, gallium and molybdenum on the room temperature tensile ductility of NiAl

Cited by 190 publications

References 4 publications

Thermal Conductivity of Intermetallic Compounds with Metallic Bonding

Thermal Conductivity of Intermetallic Compounds with Metallic Bonding

Fracture toughness evaluation of NiAl single crystals by microcantilevers—a new continuous J-integral method

The role of ALCHEMI in understanding the properties of ordered intermetallic alloys

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