Constitution of the Hf-Ni system up to 50 at.% Ni

Yeremenko, V. N.; Semenova, E. L.; Tret'yachenko, L. A.; Petyukh, V. М.

doi:10.1016/0925-8388(93)90281-q

Cited by 20 publications

(12 citation statements)

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“…Experiments performed by Yeremenko et al [18] in the Hf-Ni-Ti system suggests a complete solid solution between -NiTi and the high temperature NiHf phase through phase relations of quenched alloys and DTA measurements. However it was not possible for Yeremenko et al [18] to quench this phase from high temperature and only the low temperature B33 allotrope was ever resolved during experiments. There are also other experiments by Eremenko et al [24] which studied solid solutions between NiZr and NiHf.…”

Section: Experimental Evidence Of the B2 Phasementioning

confidence: 97%

“…Differential thermal analysis (DTA) of arc-melted samples was also used to tabulate the invariant reactions within this composition range. Svechnikov et al [11] and Yeremenko et al [18] both used DTA to measure the liquidus of the system from 0 to 100 and 0 to 50 at.% Ni, respectively. Yeremenko et al [18] reported performing additional equilibria measurements at 1473 K, 1373 K and 1273 K, but only data at 1375 K is reported.…”

Section: Equilibriamentioning

confidence: 99%

“…The large stability range of the B2-NiTi phase plays a role in the design of these alloys. It has been suggested that NiTi forms a complete solid solution with NiHf at high temperatures but the high temperature phase rich in Hf could not be analyzed after quenching [3]. Although it is likely that this phase has a B2 structure, no experiments have directly confirmed this.…”

Section: Introductionmentioning

confidence: 99%

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A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments

et al. 2018

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Hf-Ni is an important binary system for high temperature alloys and shape memory alloys which has been investigated several times in the literature but often using samples of Hf contaminated by Zr. The thermodynamics of this system are remodeled in this work based on first-principles calculations and additional experiments using Hf with relatively low Zr contamination (0.25 wt. %). Diffusion couples in the Ni-rich portion of the Hf-Ni system heat treated at 1173, 1273 and 1373 K are used to measure phase stability and Hf solubility in the fcc phase. The solubility observed in fcc Ni from Ni/Ni50Hf50 (at.%) diffusion couples is larger than that observed in previous experiments. These results are the only source fit to during modeling of the fcc solubility to mitigate effects from Zr contamination. Data in the literature suggests that the high temperature crystal structure of the B33 NiHf phase is, in fact, the B2 structure. High temperature synchrotron measurements provide confirmation of this crystal structure. Modeling of the B2 phase was aided by first-principles calculations using special quasi-random structures (SQS). The present CALPHAD model will prove useful when designing shape memory alloys containing Hf and when modeling the Hf activity in Ni-base high temperature alloys.

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Section: Experimental Evidence Of the B2 Phasementioning

confidence: 97%

Section: Equilibriamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments

et al. 2018

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“…While the binder phase in Ni-bonded cermets usually retains its face centred cubic structure, both Ti and Hf form stable intermetallic phases with the metal [7,8].…”

Section: Introductionmentioning

confidence: 99%

Crystal structure of the binder phase in a model HfC–TiC–Ni material

Heiligers

Neethling

2008

Journal of Alloys and Compounds

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“…The sections between TiNi equiatomic phases formed by Ti or Ni with the above metals are shown to be quasibinary [1][2][3][4]. The mononickelides of transient metals, which may form a quasibinary section by interacting with TiNi, include YNi in view of its thermodynamic properties.…”

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confidence: 99%

TiNi-YNi alloys. Interaction with hydrogen

Semenova

Khomko

Petyukh

2007

Powder Metall Met Ceram

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Phase equilibria in the Ti-Ni-Y system at the TiNi-YNi section are studied using physical and chemical methods (metallography, radiography, differential thermal and electron microprobe analyses). Data on hydrogen sorption and desorption by ternary system Y-Ni alloys are obtained. It is shown that the TiNiYNi section is quasibinary eutectic with the coordinates 990°C and ∼40 at.% Y. The solubility of Y and Ti in TiNi and YNi mononickelides is approximately <0.3 and 1 at.%. Equiatomic ternary (TiNiY) phase in the Ti-Ni-Y is not found. The alloy of equiatomic composition turns out to be ternary: + + . Based on sorption data, two hydrides may exist in the alloys with 30 to 40 at.% Y, which are thermally stable at 800°C and over a range of 300 to 600°C. It is revealed that the maximum amount of hydrogen at 0.1 MPa is absorbed by binary the YNi, YNi 2 , and YNi 5 phases at room temperature.We have previously studied the phase equilibria in ternary systems of TiNi with Sc, Zr, Hf, Rh, Ru, and Ir. The sections between TiNi equiatomic phases formed by Ti or Ni with the above metals are shown to be quasibinary [1][2][3][4]. The mononickelides of transient metals, which may form a quasibinary section by interacting with TiNi, include YNi in view of its thermodynamic properties. The Ni-Ti-Y system is of interest in that it has a component that, based on its position in the periodic table, should be similar to scandium (in the group) and zirconium (in the period) and whose alloys may show chemical and thermomechanical properties peculiar to Ni-Sc-Ti (Zr, Hf) systems.Published data on the interaction of components in the Ni-Ti-Y system are limited to the patented ternary alloy Ti-(50-60) at.% Ni-(0.001-0.05) at.% Y [5]. Yttrium admixtures promote the deoxidation of TiNi and improve its deformability, increase the martensitic transformation temperature, and constrict the temperature hysteresis.There are no published data on phase equilibria in the ternary system. Bounding binary systems were studied repeatedly, their phase diagrams have been plotted [6][7][8][9][10][11][12][13]. According to the experimental data obtained in [6] for distilled yttrium and iodide titanium as starting materials, the Ti-Y is a eutectic system with eutectic coordinates: L ↔ βTi (0.2 at.% Y) + αY, 18.7 at.% Ti, and 1355 ± 10°C. The metatectic reaction βY → αY + L occurs in yttrium-based alloys at 1440 ± 5°C.The Ti-Y phase diagram [6] differs from those in [7,8] that are based on less pure components only in transformation temperatures and composition of invariant points. Thermodynamic calculations of phase equilibria in the Ti-Y system based on the experimental data [6-8] and taking account of experimental uncertainties admit that the phase diagram may be plotted using the reaction temperatures from [6] but assume that immiscibility is possible in liquid state at ~19 to 70 at.% Ti [9].The Ni-Y system is rich in intermediate phases: there are nine of them and they have very limited homogeneity regions. Only two of them ⎯ Y...

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Constitution of the Hf-Ni system up to 50 at.% Ni

Cited by 20 publications

References 2 publications

A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments

A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments

Crystal structure of the binder phase in a model HfC–TiC–Ni material

TiNi-YNi alloys. Interaction with hydrogen

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