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PHASE DIAGRAMS FOR THE SYSTEMS CHROMIUM-NIOBIUM AND CHROMIUM-NIOBIUM-NICKEL

Journal Article · · Issled. po Zharoproch. Splavam, Akad. Nauk SSSR, Inst. Met.
OSTI ID:4714252
;
The Cr--Nb, quasibinary NbCr/sub 2/--Ni/sub 3/Nb, and Cr--Nb--Ni systems were studied in detail by differential thermal analysis x-ray diffraction. The phase diagrams derived are given. The Cr--Nb alloy containing 47.18% Nb was found to undergo an allotropic transformation at 1590 deg C, and to have a mp of 1720 deg C; the allotropic transformation is associated with a transition from a low temperature BETA structure of the MgCu/sub 2/ type to a high-temperature one ( epsilon ) of the MgZn/sub 2/ type with lattice parameters a = 4.92 and c = 8.10 kX. In the system Nb--Cr, a eutectoid transformation ( epsilon in equilibrium alpha + BETA ) occurs at 1585 deg C in Cr-rich alloys, while a peritectoid transformation takes place at 1625 deg C in Nb-rich alloys. The addition of > 5-6% Ni to the NbCr/sub 2/, with tempering at 1100 deg C, causes the formation of a new phase that is assumed to consist of a solid solution of Ni in the epsilon -modification of NbCr/sub 2/; the solubility of Ni in the epsilon -phase is 36% at 1100 deg . A four-phase peritectoid equilibrium gamma + epsilon in equilibrium alpha + delta (where delta is Ni/sub 3/Nb) exists at 1160 deg C in the Cr--Ni--Nb diagram, in the section confined within the Cr -- Ni -- Ni/sub 3/Nb -- NbCr/sub 2/ quadrangle; the composition of the peritectoid point is: 30.0% Cr, 23.5% Nb, 46.5% Ni. This quadrangle contains one quasibinary section only, namely, the NbCr/sub 2/--Ni/sub 3/Nb one. (OTS)
Research Organization:
Originating Research Org. not identified
NSA Number:
NSA-17-027825
OSTI ID:
4714252
Journal Information:
Issled. po Zharoproch. Splavam, Akad. Nauk SSSR, Inst. Met., Journal Name: Issled. po Zharoproch. Splavam, Akad. Nauk SSSR, Inst. Met. Vol. Vol: 8
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

ALLOTROPY
CHROMIUM ALLOYS
DIFFRACTION
DTA
EXPANSION
INTERMETALLIC COMPOUNDS
LATTICES
MELTING POINTS
METALS, CERAMICS, AND OTHER MATERIALS
NICKEL ALLOYS
NIOBIUM ALLOYS
PHASE DIAGRAMS
SOLID SOLUTIONS
SOLUBILITY
TEMPERATURE
TEMPERING
X RADIATION