THE CONSTITUTION DIAGRAM OF THE TUNGSTEN-OSMIUM BINARY SYSTEM

Journal Article · Tue Aug 01 04:00:00 EDT 1961 · J. Less-Common Metals

DOI:https://doi.org/10.1016/0022-5088(61)90025-X· OSTI ID:4842344

Taylor, A; Kagle, B J; Doyle, N J

The constitution diagram of the refractory alloy binary system tungsten-- osmium was determined using a combination of x-ray and micrographic techniques. The system contains three single-phase fields, namely: a body-centered cubic alpha --W primary solid solution which retains approximately 18.5 at % Os at the peritectic temperature of 2945 deg C, dropping to approximately 6 at% Os at 1200 deg C; a tetragonal sigma --phase which forms peritectically at 22 at% Os and at a temperature of 2945 deg C by reaction between alpha --W solid solution and liquid, the sigma --phase field opening out and extending at 1200 deg C from 21 to 35 at% Os; and a hexagonal close packed terminal solid solution based on theta --Os, whose solid solubility limit ranges from 46 at % Os at the eutectic temperature of 2725 deg C to 68 at % Os at 1200 deg C. Lattice parameters were evaluated for alpha -, sigma -, and theta -phase alloys along with their Vickers hardness values. Sigma--phase alloys were found to be extremely hard and brittle and scratch glass very easily. (auth)

• Research Organization: Westinghouse Electric Corp., Pittsburgh
• NSA Number: NSA-15-029749
• OSTI ID: 4842344
• Journal Information: J. Less-Common Metals, Journal Name: J. Less-Common Metals Vol. Vol: 3
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BRITTLENESS
EUTECTICS
HARDNESS
HIGH TEMPERATURE
LATTICES
LIQUID METALS
METALS, CERAMICS, AND OTHER MATERIALS
OSMIUM ALLOYS
PHASE DIAGRAMS
REFRACTORIES
SOLID SOLUTIONS
TUNGSTEN ALLOYS
X RADIATION