Transition from positive to negative temperature dependence of the strength in Ni3Ge-Fe3Ge solid solution

Suzuki, Tomoo; Oya, Yoshihiro; Wee, Dang-Moon

doi:10.1016/0001-6160(80)90165-0

Cited by 96 publications

(23 citation statements)

References 40 publications

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“…The transition from a positive to a negative temperature dependence of strength has been reported in a series of polycrystalline (Ni, Fe)3Ge ternary alloys with the L12 structure by the present authors [10]. In order to describe the weakly-positive temperature dependence of strength of (Ni, Fe)~Ge alloys, they have proposed a refined method for the derivation of the activation constant of the anomalous behaviour [9].…”

Section: Derivation Of the Activation Constantmentioning

confidence: 64%

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The temperature dependence of the strength of pseudo-binary platinum-based L12 alloys with B-subgroup elements

Suzuki

Oya

1981

J Mater Sci

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The notable effect of atomic radius ratio of the components of L12-0rdered alloys on the temperature dependence of their strength has been demonstrated using suitable alloys and alloying elements. Pt3 In and Pt3Sn were chosen and partial substitutions were made of the minor components with Ga and TI, and with Ge and Pb, respectively, keeping the electron concentration of the system constant. The positive temperature dependence was generally found to be strengthened by the smaller substituting atoms and to be weakened by the larger atoms. On the other hand, the substitution of In was found to strengthen the anomalous behaviour of Pt3 Ga. Thus, a maximum anomalous strengthening is achieved with an In-rich Pt3(I n, Ga) alloy, which forms a continuous solid solution with a L12 structure. All these effects are consistent with the model obtained previously by experiments on binary L12 alloys and are correlated to the radiusratio rule, which leads to the change of phase stability of L12 alloys.

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Section: Derivation Of the Activation Constantmentioning

confidence: 64%

“…X-ray analysis was carried out using mostly MoKa and CrKa radiations using a Shimadzu diffractometer. The details of the experimental methods have been given previously [8][9][10].…”

mentioning

confidence: 99%

The temperature dependence of the strength of pseudo-binary platinum-based L12 alloys with B-subgroup elements

Suzuki

Oya

1981

J Mater Sci

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“…Again, the fit of equation (9) to the data in literature is shown in Figure 6. [14][15][16][17][18] Note that the orientation dependence (Schmid factor violation) is not included in the model.…”

Section: Matrix and Precipitate Friction Stressesmentioning

confidence: 99%

A Fast Spreadsheet Model for the Yield Strength of Superalloys

Parthasarathy¹,

Rao²,

Dimiduk³

2004

Superalloys 2004 (Tenth International Symposium)

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Simulation methods allow the possibility of overcoming some of the deficiencies of analytical models. In a recent work, we have developed a numerical model (the details of which are published elsewhere 7 ) that considers the actual microstructure of a superalloy and uses accurate descriptions of dislocation behavior to predict the critical resolved shear stress for a given microstructure. This numerical model captures the physics of the problem accurately (for cutting via single APB-coupled dislocation pairs and bowing-assisted cutting), but is computationally expensive. In this work, we present an approach that uses the numerical discrete dislocation (DD) model to build a fast spreadsheet model that may be of industrial use.A methodology to rapidly evaluate the yield strength of superalloys using a fast spreadsheet model was explored. The results from a physics-based discrete dislocation simulation model were fit to polynomials. These were used along with appropriate heuristic logic, to develop a spreadsheet that can predict the yield strength from the composition, and microstructural parameters of an alloy. The model was compared with data available for a series of superalloys and found to have good correspondence. IntroductionThe nickel-based superalloys are a metallurgical marvel and have benefited from several decades of evolutionary changes. It is generally agreed by metallurgists that even in this class of the most evolved and complex alloys, the mechanical behavior is dictated almost entirely by the microstructure and chemistry of the phases. However it is also generally agreed that the ability to predict mechanical behavior poses great difficulties even when the microstructure and chemistry are well characterized in a given alloy. Of the various mechanical properties of design interest, the yield strength is likely the easiest to predict. There have been published works in which semi-empirical models were built using data from well-designed experiments with reasonable success. (see for example, Schirra 1 ) However for alloy design, and for studying effects of a wider range of variables, physics-based models are desired. The present work is an attempt at such a model. We begin with a brief description of the status of physicsbased models, to bring out the novelty of the present work.The paper is organized as follows. We start with a description of the microstructure as represented in the model, and a brief overview of the approach used to derive the spreadsheet model. We then present elements of this derivation, which include the numerical DD model. Next the results of a parametric study conducted using the physics-based numerical model is presented. The predicted dependence of the yield strength of superalloys on various microstrucutral parameters is shown. Finally the derivation of the spreadsheet model from these parametric studies is presented; the predictions of the spreadsheet model are shown compared with experimental data. Superalloy Microstructure Considered by the ModelThe focus of this...

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“…L1 2 structure Ni 3 Al is the first material reported to have this property [11,[26][27][28][29]. L1 2 structure Ni 3 Ge [30][31][32], Ni 3 Si [33][34][35] Ni 3 Ga [36][37][38] and Al 3 Ti [39] are also found to have this property. Geng et al [40] provided a quantitative method to confirm the increase of yield strength of Ni-base superalloys at elevated temperature which is in agreement with the results of experiments.…”

Section: {010}mentioning

confidence: 99%

“…This can give a more accurate description of the anomalous yield stress than predictions at 0 K. Pressure also has important effects on elastic constants and stacking fault energy. Therefore, it is interesting to study the pressure dependent p-factor for typical L1 2 intermetallics, such as Ni 3 Al [27][28][29], Ni 3 Ge [30][31][32], Ni 3 Si [33][34][35], Ni 3 Ga [36] and Al 3 Ti [39] which have the YSA properties. To make comparisons, we also choose Al 3 Sc which has the normal behavior.…”

Section: {010}mentioning

confidence: 99%

Effects of Alloying Atoms on Antiphase Boundary Energy and Yield Stress Anomaly of L12 Intermetallics: First-Principles Study

Gao

Wang

et al. 2018

Crystals

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Abstract:The antiphase boundary energies of {111} and {010} planes in L1 2 intermetallics (Ni 3 Ge, Ni 3 Si, Al 3 Sc, Ni 3 Al, Ni 3 Ga and Al 3 Ti) under different pressure are presented using first-principle methods. The yield stress anomaly is predicted by the energy criterion p-factor based on the anisotropy of antiphase boundary energies and elasticity. These L1 2 intermetallics exhibit anomalous yield stress behavior except Al 3 Sc. It is found that pressure cannot introduce the transition between anomalous and normal behavior. In order to investigate the transition, Al 3 Sc, Ni 3 Si and Ni 3 Ge with substituting atoms are investigated in detail due to p-factors of them are close to the critical value p c = √ 3. Al 3 Sc can change to anomalous when Sc atoms in {010} planes are substituted by Ti with plane concentration 25%. When Li substitutes Al in {111} planes, anomalous Al 3 Sc will change to normal. Ni 3 Si and Ni 3 Ge can exhibit normal yield stress behavior when Ge and Si in {111} planes are substituted by alloying atoms with plane concentrations 12.5% and 25%. When Ga and Al substitute in {010} planes, normal Ni 3 Si and Ni 3 Ge will revert to anomalous behavior. Therefore, transparent transition between normal and anomalous yield stress behavior in L1 2 intermetallics can be introduced by alloying atoms.

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Transition from positive to negative temperature dependence of the strength in Ni3Ge-Fe3Ge solid solution

Cited by 96 publications

References 40 publications

The temperature dependence of the strength of pseudo-binary platinum-based L12 alloys with B-subgroup elements

The temperature dependence of the strength of pseudo-binary platinum-based L12 alloys with B-subgroup elements

A Fast Spreadsheet Model for the Yield Strength of Superalloys

Effects of Alloying Atoms on Antiphase Boundary Energy and Yield Stress Anomaly of L12 Intermetallics: First-Principles Study

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