Abstract
Abstract The solute-dislocation (S-D) interaction energies for various kinds of transition-metal (TM) and of B-subgroup (B-sub) solutes in nickel (Ni) have been calculated using tight-binding theory, taking account of lattice relaxation around the solute atom. It turns out that the S-D interaction energy for TM solutes becomes almost equal to that for B-sub solutes at an equal value of size-misfit in nickel. This means that the extra contribution of TM solutes to the S-D interaction (which has been observed for certain alloy systems such as Ni3Al-based alloys) does not exist for Ni-based f.c.c. alloys. We will show that such a contribution depends very sensitively on the character of the solute-lattice-defect interaction and the materials; it can be expected to occur in intermetallic compounds like Ni3Al.
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