Abstract
Titanium aluminides have attractive properties at elevated temperatures. Recently, considerable effort has been directed toward determining the hydrogen susceptibility of Ti[sub 3]Al ([alpha][sub 2]) and TiAl ([gamma]) intermetallic compounds. It is known that the [alpha]-titanium, which is the low temperature phase of pure titanium, has a very low solubility for hydrogen and precipitates a hydride when the solubility limit is reached. From this aspect, the [alpha][sub 2] phase, whose titanium content is much more than that of the [gamma] phase, is considered to precipitate a hydride easily. This means that hydrogen embrittlement in [alpha][sub 2] based alloys occurs more easily than in [gamma] based alloys. There have been a number of recent reports on hydride in [alpha][sub 2] or [gamma] based alloys, but less in two-phase ([alpha][sub 2] + [gamma]) alloys. This report presents a preliminary result of the effect of hydrogen charging on the microstructures in two-phase ([alpha][sub 2] + [gamma]) titanium aluminides by cathodic charging.
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