Abstract
Abstract Three ternary L12Ni3(Si,Ti) alloys were tensile tested in various environments at room temperature to evaluate the effect of stoichiometry on the severity of hydrogen embrittlement. In addition, three quaternary alloys, each containing 1 at% Cr were also similarly tested to verify previously reported beneficial effects of the Cr addition. The embrittlement sensitivity to hydrogen partial pressure was studied. The results of this study showed that the severity of embrittlement is strongly dependent on alloy stoichiometry, that Cr addition does not provide any direct benefit, that embrittlement is a function of the hydrogen partial pressure in the environment, and that molecular hydrogen dissociation is more critical than water vapor dissociation. Based on the data, it is argued that hydrogen ‘wetting’ of the crack tip and hydrogen penetration play a role in embrittling the alloys, the relative importance being stoichiometry-dependent.
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