Effect of hydrogen on the formation of the structure and phase composition in the Ti^sub 2^AlNb-based alloy

• Published in: Physics of metals and metallography Vol. 109; no. 2; p. 142
• Main Authors: Illarionov, A G, Grib, S V, Popov, A A, Demakov, S L, Karabanalov, M S, Khadzhieva, O G, Elkina, O A
• Format: Journal Article
• Language: English
• Published: Moscow Springer Nature B.V 01.02.2010
• ISSN: 0031-918X; 1555-6190
• DOI: 10.1134/S0031918X10020067

Methods of X-ray diffraction, electron microprobe analysis, electron microscopy, differential thermal analysis, and microdurometry were used to study the effect of alloying with 5.2 and 8.5 at % hydrogen on the occurrence of phase and structural transformations in the intermetallic alloy Ti--24.3 Al--24.8 Nb--1.0 Zr--1.4 V--0.6 Mo--0.3 Si (at %) upon heating in the temperature range of 700-1050°C. It has been established that hydrogen favors the stabilization of the ϒ solid solution, the suppression of the formation of the α ^sub 2^ phase, and the reduction of the temperature of heating for quenching, starting with which the formation of an ordered a phase is possible in the alloy structure. Procedures of calculation of the electron concentration in the alloys with hydrogen have been proposed. By the method of the differential scanning calorimetry, the temperatures of disordering have been determined in the alloys.[PUBLICATION ABSTRACT]