The mechanical behavior of nonstoichiometric compounds Ni3Si, Ni3Ge, and Fe3Ga

Suzuki, Tomoo; Oya, Yoshihiro; Ochiai, Shouichi

doi:10.1007/bf02644399

Cited by 55 publications

(11 citation statements)

References 34 publications

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“…Nevertheless, some indications have been found to show this kind of effect caused by ternary addition of later transition metal elements on the mechanical anomaly of Ni3Al. At the majority component-rich side of stoichiometry where the excess atoms substitute for aluminum sites, it is observed that with increasing majority component the magnitude of the anomalous positive temperature dependence of strength is reduced (12)(32) (33). ‡W .…”

Section: The Magnitude Of the Positive Temperature Dependence Of Strementioning

confidence: 99%

Mechanical Properties of Ni<SUB>3</SUB>Al with Ternary Addition of Transition Metal Elements

et al. 1986

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A systematic investigation is carried out on the temperature dependence of strength in ternary Ni3Al compounds with additions of transition metal elements. The rate of solid solution hardening per one with the rate of lattice parameter change, da/dc, although a linear correlation has been found for the addition of B-subgroup elements. The rate of change in activation energy to provide the anomalous positive temperature dependence of strength per one atomic percent of the solute, du/dc, is then evaluated. Together with the results for the addition of B-subgroup elements, the apparent valence is assigned for each transition metal element by an analogy utilizing equi-valence contour determined for B-subgroup elements. Then it becomes possible to discuss the relative magnitude of the mechanical anomaly in Ni3Al in terms of the phase stability concept of L12 phase, in which e/a ratio as well as the atomic radius ratio of the compound, RB/RA, as affected by ternary addition is an important parameter to alter the stability of the phase against other geometrically close packed phases. (Received August 9, 1985) Keywords shown that the characteristic mechanical anomaly of the compound is enhanced by such additions as to increase the electron-atom ratio and/or the atomic radius ratio of the compound. Then the rate of change in activation energy for the thermally activated process to provide the mechanical anomaly per one atomic percent of solute, dU/dc, has been evaluated for a variety of ternary alloying elements in relation to the valence difference between a ternary B-subgroup element andshown that the rate of solid solution hardening seems to be proportional to that of change in lattice parameter by additions of the Bsubgroup element, da/dc.In the present investigation, a similar strategy is extended toward evaluating the role of ternary additions of transition elements into the compound in its mechanical properties. Practically information on the effects of ter-

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Section: The Magnitude Of the Positive Temperature Dependence Of Strementioning

confidence: 99%

Mechanical Properties of Ni<SUB>3</SUB>Al with Ternary Addition of Transition Metal Elements

et al. 1986

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“…The average Drain sizes were estimated to be 400 to 500 pm in Ni3Al and about 20 pm in I$i3Si [22]. Smaller grain size obtained in Ni3Si was attributed to the grain refinement associated with the polymorphic transformation in the silicide [22], which might have caused grain-boundary strengthening sufficiently high to obscure the descendin temperature region I. In Ni3A1, the bottom temperature is Peierls stress is important, is relatively very narrow.…”

Section: Yield Strength Anomalymentioning

confidence: 95%

“…are normalized to the elastic s x ear modulus, G, to be discussed, where the values of f c were obtained from a handbook [ l B 1, I Ni-BASE L12 ALLOYS Figure 2 ( a ) shows schematically the yield strength anomaly observed in polycrystalline Ni3Al [20] and Ni-rich Ni3Si [21]. The average Drain sizes were estimated to be 400 to 500 pm in Ni3Al and about 20 pm in I$i3Si [22]. Smaller grain size obtained in Ni3Si was attributed to the grain refinement associated with the polymorphic transformation in the silicide [22], which might have caused grain-boundary strengthening sufficiently high to obscure the descendin temperature region I.…”

Section: Yield Strength Anomalymentioning

confidence: 99%

Plastic Deformation of Ordered Intermetallic Alloys: Fundamental Aspects

Yoo¹

1995

KEM

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This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

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“…Several elements are soluble in this compound and occupy the Ni or AI or both atom sites, depending on the elements. According to Guard & Westbrook (1959) and Ochiai, Oya & Suzuki (1984), for alloying transition metals, Co and Cu substitute for Ni atoms, Ti, V, Nb, Mo, Hf, Ta, W substitute for AI atoms, and Fe, Cr, Mn substitute for both atoms. Such alloying yields large changes in the mechanical properties of the compound (Guard & Westbrook, 1959).…”

Section: Introductionmentioning

confidence: 99%

“…For example, the flow stress greatly varies with alloying (Noguchi, Oya & Suzuki, 1981). Interestingly, this compound exhibits an unusual temperature dependence of the flow stress; it increases with temperature, the opposite behaviour to that of most alloys (Guard & Westbrook, 1959;Rawlings & Staton-Bevan, 1957;Aoki & Izumi, 1975;Suzuki, Oya & Ochiai, 1984). Because of this superior hightemperature property Ni 3 A1 is the main strengthening phase of commercial heat-resisting Ni-based superalloys (Decker, 1969).…”

Section: Introductionmentioning

confidence: 99%

X-ray determination of static displacements of atoms in alloyed Ni₃Al

Morinaga¹,

Sone²,

Kamimura³

et al. 1988

J Appl Cryst

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Single crystals of Ni3(A1, M) were grown by the Bridgman method, where M is Ti, V, Cr, Mn, Fe, Nb, Mo and Ta. The composition was controlled to be about NivsA120M5 so that the alloying element, M, substitutes mainly for A1. With these crystals conventional X-ray structural analysis was performed. The measured static displacements of atoms from the average lattice points depended largely on the alloying elements and varied in the range 0-00-0.13 A for Ni atoms and 0"09-0.18 A for AI atoms. It was found that these atomic displacements correlated well with the atomic radius of the alloying element, M. For example, when the atomic radius of M is larger than that of A1, the static displacements are large for the atoms in the A1 sublattice but small for the atoms in the Ni sublattice. By contrast, when the atomic radius of M is smaller than that of AI, the displacements are more enhanced in the Ni sublattice than in the AI sublattice. Thus, there is an interesting correlation between the atomic displacements in both the AI and Ni sublattices in the presence of alloying elements. This seems to be one of the characteristics of alloyed compounds with several sublattices.

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The mechanical behavior of nonstoichiometric compounds Ni3Si, Ni3Ge, and Fe3Ga

Cited by 55 publications

References 34 publications

Mechanical Properties of Ni<SUB>3</SUB>Al with Ternary Addition of Transition Metal Elements

Mechanical Properties of Ni<SUB>3</SUB>Al with Ternary Addition of Transition Metal Elements

Plastic Deformation of Ordered Intermetallic Alloys: Fundamental Aspects

X-ray determination of static displacements of atoms in alloyed Ni₃Al

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The mechanical behavior of nonstoichiometric compounds Ni3Si, Ni3Ge, and Fe3Ga

Cited by 55 publications

References 34 publications

Mechanical Properties of Ni<SUB>3</SUB>Al with Ternary Addition of Transition Metal Elements

Mechanical Properties of Ni<SUB>3</SUB>Al with Ternary Addition of Transition Metal Elements

Plastic Deformation of Ordered Intermetallic Alloys: Fundamental Aspects

X-ray determination of static displacements of atoms in alloyed Ni3Al

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Product

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X-ray determination of static displacements of atoms in alloyed Ni₃Al