Abstract
The brief development history of intermetallic alloys as structural materials has led to several examples which illustrate the important effects of alloy chemistry on the flow and fracture properties of these alloys. Several recent investigations have begun to investigate the theoretical basis underlying such phenomena. However, such treatments have typically not addressed the aspects of these property variations which may be driven by solute-dislocation interactions. Within dilute substitutional solid solutions of intermetallic alloys, several distinct glide systems can often be identified over a range of deformation temperatures. For each of these the distinct solute-dislocation interactions must be quantitatively described, related to the mobility of dislocation loop segments, and then combined in a general way to describe the observed alloy behavior. Within the present manuscript, several examples of chemically-dependent deformation phenomena are reviewed. Following this, solute hardening effects in Ni3Al alloys are reviewed to illustrate specific mechanisms which must be investigated and described by solute-strengthening theory. Finally, some results from anisotropic elasticity calculations and atomistic simulations within the embedded atom formalism, of solute-dislocation interactions in Ni3Al alloys, are presented and discussed.
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Dimiduk, D.M., Parthasarathy, T.A., Rao, S., Woodward, C. (1992). Solute-Dislocation Interactions and Solid-Solution Strengthening Mechanisms in Ordered Alloys. 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_17
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DOI: https://doi.org/10.1007/978-94-011-2534-5_17
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