Effect of orientation on the peak temperature of the yield-stress anomaly in single crystals of the Ni3Ge alloy

Abzaev, Yu. A.; Старенченко, В. А.; Solov’eva, Yu. V.; Козлов, Э. В.

doi:10.1134/s0031918x06060111

Cited by 3 publications

(4 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

See 1 more Smart Citation

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

Gao

Wang

et al. 2018

Crystals

View full text Add to dashboard Cite

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.

show abstract

Section: {010}mentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…In the present work, the temperature variations during plastic deformation of the Ni 3 Ge alloy single crystals with the [ 2 3 4] orientation of the deformation axis are investigated. Their mechanical properties and defect structure were studied in [11][12][13][14].…”

mentioning

confidence: 99%

“…The Ni 3 Ge alloy for which we performed extensive cycle of investigations [8][9][10][11][12][13][14] is among them. The study of the Ni 3 Ge single crystals with the L1 2 ordered superstructure demonstrated that the Cottrell−Stokes law was valid for samples deformed along the [001] [15] and [ 1 3 9] axes [16].…”

mentioning

confidence: 99%

Cottrell−Stokes Law for Ni3Ge Intermetallic Single Crystals with the [ 2 ¯ $$ \overline{2} $$ 3 4] Compression Axis

et al. 2015

Self Cite

View full text Add to dashboard Cite

In an experiment on the temperature variation during plastic deformation of Ni 3 Ge alloy single crystals with the [ 2 3 4] orientation of the deformation axis, a dependence of the stress jump on the applied stress is investigated. It is elucidated that under conditions of cubic slip, the dependence is linear and is similar to that observed for pure metals (the Cottrell−Stokes law). The anomalous temperature dependence of the flow stress during cubic slip is confirmed in experiments on the variation of the deformation temperature.Metal alloys are widely used in all fields of technical and scientific activity. They possess a wide spectrum of operational characteristics allowing them to be used at different temperatures and stresses. The temperature variation during deformation impact leads to the change of the material state and to the occurrence of stress jumps. It was established that the stress jumps attendant to the temperature variation depend on the stress and temperature. This dependence is well described by the linear relationship of the formThis interrelation called the Cottrell−Stokes law [1] was established for pure metals and disordered solid solutions. Whereas in pure metals and disordered solid solutions the standard behavior with temperature increase is associated with decreased mechanical characteristics, a positive temperature dependence of the flow stress [2-5] called in the literature the temperature anomaly of the mechanical properties is manifested for a number of alloys with the L1 2 superstructure. This anomalous mechanical behavior is caused by superdislocations existing in the alloys, their motion, and self-blocking [6,7]. The temperature influences on the resistance to dislocation motion in two ways. On the one hand, thermal fluctuations help the applied stress to move dislocations through obstacles, and from the other hand, they activate superdislocation self-blocking. The change of the plastic deformation carriers changes also the mechanisms of the deformation processes; therefore, the patterns of these processes can also change. In this regard, it is interesting to elucidate whether the Cottrell−Stokes law is valid for ordered alloys.It is expedient to investigate the influence of temperature variation during the deformation on the ordered alloys well studied in different aspects. The Ni 3 Ge alloy for which we performed extensive cycle of investigations [8][9][10][11][12][13][14] is among them. The study of the Ni 3 Ge single crystals with the L1 2 ordered superstructure demonstrated that the Cottrell−Stokes law was valid for samples deformed along the [001] [15] and [ 1 3 9] axes [16]. However, it is necessary to find whether this law is valid for other orientations and to elucidate conditions under which it is valid.

show abstract

Cottrell–Stokes Law for Ni3Ge Single Crystals with Different Orientations of the Axis of Deformation

Solov’eva

Starenchenko

Solov’ev

et al. 2018

Bull. Russ. Acad. Sci. Phys.

View full text Add to dashboard Cite

Effect of orientation on the peak temperature of the yield-stress anomaly in single crystals of the Ni3Ge alloy

Cited by 3 publications

References 8 publications

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

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

Cottrell−Stokes Law for Ni3Ge Intermetallic Single Crystals with the [ 2 ¯ $$ \overline{2} $$ 3 4] Compression Axis

Cottrell–Stokes Law for Ni3Ge Single Crystals with Different Orientations of the Axis of Deformation

Contact Info

Product

Resources

About