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Vol.15, No.4, 338 ~ 353, 1977
Title
Diffusion of Hydrogen in Alpha Ti - Al Alloys
박용기 , 이재영 , 김종희 Yong Ki Park , Jai Young Lee & Chong Hee Kim
Abstract
Kinetics of the reaction of hydrogen with titanium and Ti-Al alloys have been studied in the temperature range of 670℃-800℃ at % Torr hydrogen pressure using thermogravimetric method. It is found that the reaction controlling step of the two systems is hydrogen diffusion in metals. The diffusion coefficients of hydrogen in pure titanium and Ti-6 at.% Al alloy are D(㎠/sec)=3.70×10^(-2)exp-(14,400±450)/RT) and D(㎠/sec)=2.79×10^(-2)exp-(17,400±410)/RT) respectively. Aluminum decreases makedly the diffusion coefficient of hydrogen. It can be probable explained by that aluminum decreases the interstitial site of titanium lattice.
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