A study of dynamic embrittlement in bicrystals of Cu-7%Sn

Part I: Anisotropy of cracking from oxygen-induced dynamic embrittlement in bicrystals of IN718

“…The present results are essentially identical to those found previously for bicrystals of a Cu-Sn alloy [5], in which the embrittling element was the surface-active indigenous element Sn. Here, the embrittling element oxygen came from the vapor phase and was therefore exogenous to the alloy.…”

“…A later study of cracking of bicrystals of this alloy having symmetrical˙= 5 (013) tilt boundaries showed that it occurred much more rapidly along the tilt axis (i.e., the fast-diffusion direction) than perpendicular to the tilt axis [5]. This supported the proposition that the phenomenon involves diffusive penetration by the surface element into the core of a sharp crack and that the atomic configuration along the grain boundary would play a decisive role.…”

The relationship between hot ductility and intergranular fracture in a CuSn6P alloy at elevated temperatures

“…It has been found that the observed embrittlement of copper and its alloys is in the investigated conditions usually the result of the effect of intergranular cavitation, induced by grain-boundary sliding [7,8]. The loss of plasticity in the DMT range may also be conditioned by the intergranular segregation of alloying components or impurities [9].…”