The constitution of the chromium-niobium-molybdenum system

Goldschmidt, H. J.; Brand, Jörg

doi:10.1016/0022-5088(61)90042-x

Cited by 78 publications

(17 citation statements)

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“…However, the low-temperature brittleness of Laves phase intermetallics often requires the incorporation of an additional, more ductile phase for practical applications [9]. Several two phase (bcc+Laves) alloys have been explored, and studies suggest that an optimized microstructure contain discrete Laves phases in a fine-grain structure [2,8,10,11]. The decomposition of a metastable precursor phase from rapid solidification in this study explores and demonstrates a methodology for achieving such microstructures.…”

Section: Introductionmentioning

confidence: 97%

“…The equilibrium two-phase product is being explored as a dual phase alloy for high-temperature structural applications [3,4,5]. The NbCr 2 Laves phase has been shown to have several desirable properties such as high melting temperature (~I730°C), high temperature strength [6], reasonable oxidation resistance [7,8], and appreciable creep resistance [7]. However, the low-temperature brittleness of Laves phase intermetallics often requires the incorporation of an additional, more ductile phase for practical applications [9].…”

Section: Introductionmentioning

confidence: 99%

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Formation of a Metastable BCC Solid Solution and Decomposition to aC15 Laves Phase in Melt-Spun CrNb₁₀Ti₁₀

et al. 1997

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A metastable, disordered bcc phase has been formed from the melt in a Cr-rich alloy of the Nb-Cr-Ti system, where large volume fractions of the Laves phase would develop under equilibrium solidification conditions. X-ray diffraction (XRD) studies and lattice constant determinations confirm that the melt-spun ribbons contain a bcc phase beyond its terminal solid solution limits. Solidification pathways are proposed based upon metastable and equilibrium phase diagrams. Microstructures have been studied using optical microscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Cross-sectional TEM reveals tiny, dispersed Laves phase precipitates within the metastable bcc grains near the chill (wheel) side. Away from the wheel, the microstructure changes to a dendritic structure of the bcc and C15 Laves phase. Annealing of the melt-spun ribbons produces a fine, two-phase microstructure of the equilibrium phases. Microstructures from the melt-spun and arc-melted processing conditions are compared. The microstructural control afforded through this metastable processing route enables a methodology to tailor phase distributions for optimized toughness in Laves phase alloys.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Formation of a Metastable BCC Solid Solution and Decomposition to aC15 Laves Phase in Melt-Spun CrNb₁₀Ti₁₀

et al. 1997

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“…For instance, in the Cr end (Cr 67 Nb 33 ) the formation of a metastable bcc phase has been achieved by mechanical alloying 3 , yielding a periodic structure which involved the presence of the Cr 2 Nb intermetallic. Typically, alloys which contain Cr 2 Nb are candidates for high-temperature structural applications 4 which require oxidation resistance 5 and for compositions up to approximately 37 at.% Nb, Cr 2 Nb is naturally derived as it is the only stable phase in the Cr-Nb phase diagram, crystallizing either into the cubic or the hexagonal lattice. However, the Nb-rich end of the Cr-Nb phase diagram may lead to both crystalline and amorphous phases, the structure of the latter mostly unexplored.…”

Section: Introductionmentioning

confidence: 99%

Short range order and stability of a mechanically alloyed Cr25Nb75 glass determined by total scattering and first principles

Antipas

2014

Mat. Res.

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“…However, the low-temperature brittleness of Laves phase intermetallics often requires the incorporation of an additional, more ductile phase for practical applications [9]. Several twophase (bcc+Laves) alloys have been explored, and studies suggest that an optimized microstructure contain discrete Laves phases in a fine-grain structure [2,8,10,11]. The decomposition of a metastable precursor phase from rapid solidification in this study explores and demonstrates a methodology for achieving such microstructures.…”

Section: Introductionmentioning

confidence: 99%

“…The equilibrium two-phase product is being explored as a dual phase alloy for hgh-temperature structural applications [3,4,5]. The NbCr, Laves phase has been shown to have several desirable properties such as high melting temperature (-1730°C), hightemperature strength [6], reasonable oxidation resistance [7,8], and appreciable creep resistance [7]. However, the low-temperature brittleness of Laves phase intermetallics often requires the incorporation of an additional, more ductile phase for practical applications [9].…”

Section: Introductionmentioning

confidence: 99%

Formation of a metastable bcc solid solution and decomposition to a C15 Laves phase in melt-spun CrNb{sub 10}Ti{sub 10}

Chen¹,

Kotula²,

Chu³

et al. 1998

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DISCLAIMERThis repon 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 employe#, 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, proc+ss, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, m mmendation, 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 thosc of the United States Government or any agency thereof. A metastable, disordered bcc phase has been formed from the melt in a Cr-rich alloy of the Nb-Cr-Ti system, where large volume fractions of the Laves phase would develop under equilibrium solidification conditions. X-ray diffraction (XRD) studies and lattice constant determinations confirm that the melt-spun ribbons contain a bcc phase beyond its terminal solid solution limits. Solidification pathways are proposed based upon metastable and equilibrium phase diagrams. Microstructures have been studied using optical microscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Cross-sectional TEM reveals tiny, dispersed Laves phase precipitates within the metastable bcc grains near the chill (wheel) side. Away fiom the wheel, the microstructure changes to a dendritic structure of the bcc and C15 Laves phase. Annealing of the melt-spun ribbons produces a fine, two-phase microstructure of the equilibrium phases. Microstructures fiom the melt-spun and arc-melted processing conditions are compared. The microstructural control afforded through this metastable processing route enables a methodology to tailor phase distributions for optimized toughness in Laves phase alloys. FORMATION OF A METASTABLE BCC SOLID SOLUTION AND DECOMPOSITION TO A C15 LAVES PHASE IN MELT-SPUN

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The constitution of the chromium-niobium-molybdenum system

Cited by 78 publications

References 2 publications

Formation of a Metastable BCC Solid Solution and Decomposition to aC15 Laves Phase in Melt-Spun CrNb₁₀Ti₁₀

Formation of a Metastable BCC Solid Solution and Decomposition to aC15 Laves Phase in Melt-Spun CrNb₁₀Ti₁₀

Short range order and stability of a mechanically alloyed Cr25Nb75 glass determined by total scattering and first principles

Formation of a metastable bcc solid solution and decomposition to a C15 Laves phase in melt-spun CrNb{sub 10}Ti{sub 10}

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The constitution of the chromium-niobium-molybdenum system

Cited by 78 publications

References 2 publications

Formation of a Metastable BCC Solid Solution and Decomposition to aC15 Laves Phase in Melt-Spun CrNb10Ti10

Formation of a Metastable BCC Solid Solution and Decomposition to aC15 Laves Phase in Melt-Spun CrNb10Ti10

Short range order and stability of a mechanically alloyed Cr25Nb75 glass determined by total scattering and first principles

Formation of a metastable bcc solid solution and decomposition to a C15 Laves phase in melt-spun CrNb{sub 10}Ti{sub 10}

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Formation of a Metastable BCC Solid Solution and Decomposition to aC15 Laves Phase in Melt-Spun CrNb₁₀Ti₁₀

Formation of a Metastable BCC Solid Solution and Decomposition to aC15 Laves Phase in Melt-Spun CrNb₁₀Ti₁₀