Abstract
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.
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