PHASE DIAGRAM FOR THE SYSTEM TITANIUM-TIN (in Russian)
Differential thermal analysis, microstructural analyses, and determinations of hardness values and electric resistance were used to construct a diagram of state for the binary system Ti-Sn up to the composition of the compound Ti/sub 3/Sn (from 0 to 25 at.% Sn). Analyses of the thermograms showed that all conversions proceeding with the absorption of heat could be detected on the heating curves. Tin lowers the temperature of conversion of titunium with 5.0 at.% tin first to a minimum at 860 tained C which then increases to 890 tained C at higher tin contents. A peritectoid reaction ( alpha / sub 2/ were ob ore resistant t + ) takes place with a conversion temperature at 890 tained C. A HF-HNO/sub 3/-glycerin etch showed a single-phase homogeneous structure of an alpha -solid solution with alloys containing up to 9 at.% Q. The amount of a second -phase increases with increasing tin content until a single-phase structure of a -solid solution of the compound Ti/sub 3/Sn is noted with alloys containing 23 to 25 at.% Sn. Alloys containing 8 to 22.5 at.% Sn undergo a peritectoid reaction, at a temperature of 890 tained C as shown by thermal analyses and by microstructural analyses of samples quenched frorn above and below the conversion temperature. A study of the microstructure of quenched alloys showed that the solubility of tin in ore resistant t -titanium increases from 8 at.% Sn at 890 tained C to 10.5 at.% Sn at 1100 tained C. X-ray analyses of annealed samples of alloy showed only the lines of an alpha solid solution for 5, 8, 9 at.% Sn, a -solid solution for 23 at.% Sn (close to the composition Ti/sub 3/Sn), and an alpha and mixed phase for a 15 at.% Sn. Vickers hardness numbers were determined with a diamond pyramid at a loading of 10 kg. The hardness increases smoothly with increasing tin content to a maximum at the saturation solubility of the tin in the alpha - or ore resistant t -solid solution. The hardness decreases smoothly with the appearance of the -phase until it attains a minimum at the composition of the compound Ti/sub 3/Sn. The specific electric resistance increases with an increase of tin in the solid solution of alpha -titanium. The rate of increase of the specific electric resistance decreases markedly with the appearance of the -phase. The electric resistance of an alloy with 14.3 at.% Sn was studied as a function of temperature from room temperature to 1100 tained C in special vacuum equipment. A sharp drop in electric resistance a; 890 tained C confirmed the existence of a peritectoid reaction in the system Ti-Sn. (TTT)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-14-019472
- OSTI ID:
- 4182868
- Journal Information:
- Zhur. Neorg. Khim., Vol. Vol: 5; Other Information: Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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Related Subjects
ABSORPTION
ALCOHOLS
ALLOTROPY
CONFIGURATION
DIAGRAMS
DIAMONDS
ELECTRIC CONDUCTIVITY
ETCHING
EUTECTICS
EXPANSION
GLYCERIN
HARDNESS
HIGH TEMPERATURE
HYDROFLUORIC ACID
INTERMETALLIC COMPOUNDS
LABORATORY EQUIPMENT
METALLOGRAPHY
NITRIC ACID
PHASE DIAGRAMS
PRESSURE
QUANTITY RATIO
REACTION KINETICS
SAMPLING
SOLID SOLUTIONS
SOLUBILITY
TEMPERATURE
THERMAL ANALYSIS
THERMAL RADIATION
THERMODYNAMICS
TIN
TIN ALLOYS
TITANIUM
TITANIUM ALLOYS
TITANIUM-ALPHA
TITANIUM-BETA
VACUUM
VICKERS HARDNESS
X RADIATION