SYMPOSIA PAPER Published: 01 January 1989
STP18844S

Strain-Induced Hydrides and Hydrogen-Assisted Crack Growth in a Ti-6Al-4V Alloy

Source

The formation of strain-induced hydrides and the interaction of hydrides with crack growth in a Ti-6Al-4V alloy containing 790-ppm hydrogen have been studied by transmission electron microscopy (TEM) of thin-foil specimens stretched in situ. Three types of strain-induced hydrides were found: a crack tip hydride and two plate-like hydrides. The hydrides have either a face-centered tetragonal (fct) or a face-centered cubic (fcc) structure and are metastable. The formation and subsequent rupture of the hydrides at and in front of the crack tip were observed during crack growth. Hydrogen-assisted crack growth in Ti-6Al-4V alloys is discussed in terms of a hydride mechanism for cracking.

Author Information

Gao, S-J
Institute of Metal Research, Academia Sinica, Shenyang, People's Republic of China
Xiao, H-Z
Institute of Metal Research, Academia Sinica, Shenyang, People's Republic of China
Wan, X-J
Institute of Metal Research, Academia Sinica, Shenyang, People's Republic of China
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Details
Developed by Committee: E08
Pages: 569–580
DOI: 10.1520/STP18844S
ISBN-EB: 978-0-8031-5081-2
ISBN-13: 978-0-8031-1250-6