STRUCTURE OF HYDRIDES IN HIGHLY HYDROGENATED Ti-6Al-4V ALLOY

摘要

The microstrueture and various hydrides precipitated in Ti-6A1-4V alloys containinghydrogen 0.16,0.58,0.87,1.49 wt-%,respectively,have been studied by means of TEM andX-ray diffraction.The Ti3Al phase may precipitate when H over 0.58 wt-%.In the sametime,the morphology of hydrides gradually changed from rugged sheets to narrow laths asH contents increased.The microstructure of highly H-doped alloys is obviously fine.A mas-sive hydride and the hydride with tetragonal lattice were observed in the specimen containing1.49 wt-%H.The twin hydrides were found in the alloys with different H contents and theelectron diffraction patterns of the twin hydrides can be served as a simple criterion for distin-guishing the cubic and tetragonal structures.