Abstract
It is argued that the improvement in the ductility of Ni3Al, Ni3Ga, Ni3Si and Ni3Ge through the addition of boron (in the ppm range) and of Zr3Al through fast neutron irradiation is related to an increase in the transmission of slip across the grain boundaries. The transmittal mechanism is dislocation nucleation at the heads of pile-ups, and this is made easier through the disordering of the boundaries. The evidence supporting this view is reviewed. It is suggested that grain boundary disorder may be a general requirement for ductility.
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Schulson, E.M., Baker, I. (1992). The Brittle to Ductile Transition and the Transmission of Slip across Grain Boundaries in L12 Intermetallic Compounds. In: Liu, C.T., Cahn, R.W., Sauthoff, G. (eds) Ordered Intermetallics — Physical Metallurgy and Mechanical Behaviour. NATO ASI Series, vol 213. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2534-5_24
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