The Role of Grain Boundary Chemistry and the Environment on Intergranular Fracture.
MASSACHUSETTS INST OF TECH CAMBRIDGE CORROSION LAB
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In this discussion the influence of grain boundary segregates and their interaction with the environment will be discussed with particular reference to hydrogen-induced intergranular embrittlement. Many of the elements which are found segregated at grain boundaries i.e., the metalloid elements are catalyst poisons for the hydrogen evolution reaction in electrolytes and, hence, stimulate hydrogen absorption. The use of glassy metal alloys transition metal-metalloid type as grain boundary analogs in studying hydrogen absorption and permeation is explored. Likewise, permeation experiments which distinguish between lattice, grain boundary and dislocation transport mechanisms will be discussed. Author