Melt hydrogenation has been used to hydrogenate the titanium alloys ingots. After being remelted in H-2/Ar gaseous mixture, the hydrogen atoms can be absorbed by Ti-6Al-4V (Ti64) alloy during the remelting process, and this process will modify the microstructure noticeably. beta phase volume fraction increased with the hydrogen content in Ti64 alloy. 8 hydride was found in the specimen with different hydrogen content. Compared with the unhydrogenated alloy, the hydrogenated alloy exhibited higher plasticity. With low hydrogen content, the alloy had a higher flow stress than that of the unhydrogenated alloy. Increasing the hydrogen content, the flow stress of hydrogenated alloy decreased quickly. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.