Determination of the Nb–Cr–Si phase diagram using diffusion multiples

Zhao, Ji‐Cheng; Jackson, M. R.; Peluso, L. A.

doi:10.1016/j.actamat.2003.08.007

Cited by 100 publications

(82 citation statements)

References 25 publications

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“…Within the diffusion layers the equilibrium phases occur, whereas at the interface only local equilibrium takes place [23]. However, the diffusion couple approach is not infallible, and when it is used to determine phase diagrams, one should always consider the possibility of missing phases [20,23]. This may occur because the nucleation of these phases can be so slow that the formed diffusion layers are too thin to be detected by EPMA.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In the solid-solid diffusion couples or diffusion multiples, there are no problems associated with melting or powder contamination since all the phases form by diffusion reactions of the bulk constituents at the temperature of interest [23]. Within the diffusion layers the equilibrium phases occur, whereas at the interface only local equilibrium takes place [23]. However, the diffusion couple approach is not infallible, and when it is used to determine phase diagrams, one should always consider the possibility of missing phases [20,23].…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of the Ca–Mg–Zn system using diffusion couples and key alloys

Zhang

Kevorkov

Bridier

et al. 2011

Science and Technology of Advanced Materials

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Nine diffusion couples and 32 key samples were prepared to map the phase diagram of the Ca-Mg-Zn system. Phase relations and solubility limits were determined for binary and ternary compounds using scanning electron microscopy, electron probe microanalysis and x-ray diffraction (XRD). The crystal structure of the ternary compounds was studied by XRD and electron backscatter diffraction. Four ternary intermetallic (IM) compounds were identified in this system: Ca 3 Mg x Zn 15−x (4.6 x 12 at 335• C, IM1), Ca 14.5 Mg 15.8 Zn 69.7 (IM2), Ca 2 Mg 5 Zn 13 (IM3) and Ca 1.5 Mg 55.3 Zn 43.2 (IM4). Three binary compounds were found to have extended solid solubility into ternary systems: CaZn 11 , CaZn 13 and Mg 2 Ca form substitutional solid solutions where Mg substitutes for Zn atoms in the first two compounds, and Zn substitutes for both Ca and Mg atoms in Mg 2 Ca. The isothermal section of the Ca-Mg-Zn phase diagram at 335• C was constructed on the basis of the obtained experimental results. The morphologies of the diffusion couples in the Ca-Mg-Zn phase diagram at 335• C were studied. Depending on the terminal compositions of the diffusion couples, the two-phase regions in the diffusion zone have either a tooth-like morphology or contain a matrix phase with isolated and/or dendritic precipitates.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental study of the Ca–Mg–Zn system using diffusion couples and key alloys

Zhang

Kevorkov

Bridier

et al. 2011

Science and Technology of Advanced Materials

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show abstract

“…Within the diffusion layers the equilibrium phases occur, whereas at the interface local equilibrium takes place [23]. However, one should always consider the possibility of missing phases [23,24] while using the diffusion couple for determining the phase diagram. This may occur because of the slow nucleation of the phase which prevents formation of the diffusion layer.…”

Section: Methodsmentioning

confidence: 99%

Experimental Study of the Mg-Ni-Y System at 673 K Using Diffusion Couples and Key Alloys

Mezbahul-Islam

Kevorkov

Medraj

2015

Metals

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Three solid-solid and two solid-liquid diffusion couples together with 32 key samples were used to construct the isothermal section of the Mg-Ni-Y system at 673 K. The present investigation revealed 12 ternary intermetallic compounds. Crystal structures of two ternary compounds τ1 (Gd4RhIn prototype with lattice parameter of a = 1.3666 nm) and τ2 (Mo2FeB2 prototype with lattice parameters of a = 0.7395 nm and c = 0.3736 nm) were determined. The phase relations and ternary solubility of the binary and ternary compounds at 673 K were determined using scanning electron microscopy (SEM), wave dispersive X-ray spectrometer (WDS) and X-ray diffraction (XRD) analysis.

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“…A diffusion-multiple technique for the mapping of ternary phase diagrams was recently proposed by Zhao et al [1,2] A diffusion-multiple is a dense assembly of three or more different metal pieces. This multiple is subjected to high temperatures to allow interdiffusion reactions along two-dimensional composition gradients.…”

Section: Introductionmentioning

confidence: 99%

Phase Diagram Mapping of the Fe3Al-Cr-Mo-C Pseudo-Quaternary System at 800 °C Using a New Diffusion-Multiple Technique

Kobayashi

Zaefferer

2008

J Phs Eqil and Diff

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A new diffusion-multiple technique was used for mapping the phase diagram in the pseudoquaternary Fe 3 Al-Cr-Mo-C system at 800°C. The following five carbide phases were formed in an Fe 3 Al matrix phase (B2) with composition gradients of Cr, Mo, and C in the diffusionmultiple samples: j-Fe 3 AlC, M 5 C, M 6 C, Cr 7 C 3 , and M 2 C (M: Mo, Cr, Al, and Fe). It was assumed that B2 phase is in equilibrium with j, M 5 C, M 6 C, and Cr 7 C 3 but not with M 2 C phase at 800°C. Complex phase equilibria among those phases were efficiently mapped by the diffusion-multiple technique. The results from the technique were consistent with those obtained from the conventional bulk alloy method.

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Determination of the Nb–Cr–Si phase diagram using diffusion multiples

Cited by 100 publications

References 25 publications

Experimental study of the Ca–Mg–Zn system using diffusion couples and key alloys

Experimental study of the Ca–Mg–Zn system using diffusion couples and key alloys

Experimental Study of the Mg-Ni-Y System at 673 K Using Diffusion Couples and Key Alloys

Phase Diagram Mapping of the Fe3Al-Cr-Mo-C Pseudo-Quaternary System at 800 °C Using a New Diffusion-Multiple Technique

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