Abstract
The effects of additions of a small amount of boron and carbon on environmental embrittlement of a Ni 3 (Si, Ti) alloy are investigated by means of room temperature tensile tests in various kind of atmospheres and at various strain rates. The additions of boron and carbon to the Ni 3 (Si, Ti) alloy suppress the embrittlement in air and distilled water, and slightly reduce the embrittlement in H 2 gas. The benefiial effect of boron and carbon on environmental embrittlement may be attributed to the boron (and carbon) segregation to grain boundaries where these atoms compete their site occupation and/or their diffusion path with hydrogen atoms, resulting in the change in the fracture mode from intergranular to transgranular. Distinction in the embrittlement between air (or distilled water) and H 2 gas is considered to be due to the difference in the decomposition kinetics into hydrogen atoms
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