Abstract
Abstract Slow strain rate (tensile) tests (SSRTs) and fatigue tests were performed in air, liquid mercury, and while dynamically charging with hydrogen. The test variables included strain rate, grain size, cold work, and the charging conditions. Mercury embrittled Nickel 200 less than hydrogen did, but in a similar manner. Crack initiation was easier in hydrogen, but cracks propagated more readily in mercury. Tensile testing led to predominantly transgranular (TG) cracking that exhibited a diversity of features, including slip band separations and those resembling cleavage. Extensive intergranular (IG) cracking occurred during fatigue testing. Cracks initiated only after considerable plastic strain, and crack initiation did not immediately lead to failure.
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