Cleavage in Ti-8Al-1Mo-1V caused by hydrogen gas
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Fig. 4--Selectedarea diffractionpattern of Fig. 3 showing superlattice reflections of L]2 type. Electronbeam axis: 001.
Cleavage in Ti-8AI-1Mo-IV Caused by Hydrogen Gas D. A. MEYN
HYDROGEN
gas causes cleavage cracking in titanium alloys under staticI-4 and cyclic2'S'6 loading (fatigue). New observations show that such cleavage in Ti-8AI-IMo-IVpropagates in regular, minute increments under both loading conditions, on a plane 9 deg from {10l-0}a. Because stress corrosion cracking (SCC),7'a sustained load cracking (SLC) in inert environments, s'9 and low amplitude corrosion fatigue cracking~~in this alloy propagate on a markedly different set of cleavage planes (near (0001}a) without similar signs of incremental propagation, doubt is cast on the hydrogen-embrittlement mechanisms proposed to explain them. ~~ The starting material for the hydrogen cracking experiments was 0.265 in. thick mill annealed Ti8AI-1Mo-IV plate.7'~~Three single-edge-notched tensile specimens'~ were vacuum annealed, Table I, to eliminate susceptibility to SLC in vacuum, thus to more clearly register the isolated effects of H2. R-7VI and R-7V2 were tested in commercial ultrapurity Hz (99.999 pct) containing
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