COMPUTER SIMULATION FOR PRECIPITATION PROCESSO Ni_<75>Al_<2.5>V_<22.5> ALLOY WITH THE MICROSCOPIC PHASE-FIELD METHOD

概要

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With the microscopic phase-field model, the precipitation process of aged alloys was explored by computer simulation, which could help us clarify some discussional views on precipitation mechanisms of alloys. In this paper, the precipitation process of Ni_<75>Al_<2.5>V_<22.5> alloy was studied. From simulated microscopic behavior and calculated order parameters of different precipitates, it's found that θ ordered phase precipitated earlier than γ' ordered phase by congruent ordering + spinodal decomposition mechanism and thus produced a nonstoicheometric θ single ordered phase. Then, the nonstoicheometric γ' phase precipitated by a non-classical nucleation and growth, mechanism at the APBS of θ phases. Meanwhile, both of them transformed to stoicheometric ordered phases.
一般社団法人日本機械学会の論文
2004-11-17