Influence of hydrogen on the diffusion of alloying elements in alloys based on titanium
- Tsiolkovskii Moscow Aviation Technology Univ. (Russian Federation)
The development of new treatment technologies based on the reversible alloying for titanium alloys with hydrogen is of interest to researchers because of the possibility of efficient control of the. structure of the alloys and the combination of their technological (hydrogen plasticization and hydrogen-mechanical treatment) and operational (thermal-hydrogen treatment) properties. At present, these methods are well justified from the scientific point of view; their technological schemes and treatment modes are well developed for some commercial titanium alloys. However, the problem of the influence of hydrogen on the parameters of diffusion of alloying elements in alloys based on titanium is still unresolved. It was conjectured that the diffusion mobility of substitutional elements increases in the presence of hydrogen. As a result, {open_quotes}titanium-alloying element-hydrogen{close_quotes} systems should attain equilibrium much faster. However, the results of subsequent investigations did not corroborate this hypothesis. It was shown that hydrogen introduced in Ti-Zr alloys increases the diffusion activation energy of substitutional atoms in bcc structures. At the same time, hydrogen introduced in Ti-V model alloys and in VT23, VT6, and other commercial titanium alloys sharply decreases the first critical cooling rate, i.e., the rate at which diffusion processes are suppressed, and the original high-temperature phase either undergoes the martensite transformation or is fixed at normal temperatures without changes in its composition.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 273941
- Journal Information:
- Materials Science, Vol. 30, Issue 4; Other Information: PBD: Jan 1995; TN: Translated from Fiziko-Khimicheskaya Mekhanika Materialov; 30: No. 4, 99-101(Jul-Aug 1994)
- Country of Publication:
- United States
- Language:
- English
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