Dilatometric study of transformations in the Ti--V and Ti--Al--V alloy system (in Russian)
A study was carried out on binary titanium alloys containing omega and BETA ) after quenching and from the BETA -region, and also on ternary alloys with the same vanadium contents but with various aluminum contents (3 and 6%). Besides dilatometric analysis, x-ray and metallographic analyses were also used. After annealing the structure of all alloys was represented by alpha and BETA phases, and after quenching by the following phases: alpha ' (Ti + 4% V, Ti + 3% Al +4% V, Ti +6% Al +4% V); alpha '' (Ti +10% V, Ti 13% Al + 10% V, Ti +6% Al +10% V); BETA + omega (Ti +16% V), BETA (Ti +25% V, Ti +3% Al + 16% V, Ti +3% Al +25% V, Ti +6% Al +18% V, Ti + 6% Al +25% V). In binary alloys of the Ti- V system breakdown of martensite alpha ' is not accompanied by noticeable volumetric effects, but breakdown of martensite alpha '' is accompanied by a contraction effect at temperatures above 400 deg C. Alloying of martensite alloys in the Ti-V + 3% Al system leads to an increase in volumetric effects accompanying the breakdown of martensite alpha ' and alpha '' on heating, while alloying with 6% Al leads to almost complete disappearance of these volumetric effects. These effects indicate the breakdown of an unstable BETA -solution in Ti --V alloys, and indicate that essentially different processes are taking place in these alloys above and below 280 deg C. Aluminum decreases the volumetric effects caused by the formation and transformation of an omega phase. In the presence of aluminum, a significant contraction effect is observed at temperatures above 500 deg C which is associated with a redistribution of aluminum between the alpha and BETA phases. (SJR)
- Research Organization:
- Moscow Aviation Technology Inst.
- NSA Number:
- NSA-29-027362
- OSTI ID:
- 4336496
- Journal Information:
- Izv. Vyssh. Ucheb. Zaved., Tsvet. Met., no. 4, pp. 127-131, Journal Name: Izv. Vyssh. Ucheb. Zaved., Tsvet. Met., no. 4, pp. 127-131; ISSN IVUTA
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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