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

Acta Metall Sin

1992, Vol. 28

Issue (4): 10-16 DOI:

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

ZHANG Caibei;BIAN Weimin;LAI Zuhan;GONG Bo Northeast University of Technology; Shenyang

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ZHANG Caibei;BIAN Weimin;LAI Zuhan;GONG Bo Northeast University of Technology; Shenyang. STRUCTURE OF HYDRIDES IN HIGHLY HYDROGENATED Ti-6Al-4V ALLOYS. Acta Metall Sin, 1992, 28(4): 10-16.

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Abstract The microstructure and various hydrides precipitated in Ti--6Al--4V alloys con-taining hydrogen 0.16, 0.58, 0.87, 1.49 wt--%, respectively, have been studied by means of TEMand X--ray diffraction. The Ti_3Al phase may precipitate when [H] over 0.58 wt--%. In thesame time, the morphology of hydrides gradually changed from rugged sheets to narrow laths as[H] 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.

Key words: titanium hydride microstructure twin hydride

Received: 18 April 1992

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