

Author: Rettig Ralf Ritter Nils C Helmer Harald E Neumeier Steffen Singer Robert F
Publisher: IOP Publishing
E-ISSN: 1361-651X|23|3|35004-35027
ISSN: 0965-0393
Source: Modelling and Simulation in Materials Science and Engineering, Vol.23, Iss.3, 2015-04, pp. : 35004-35027
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Abstract
A method for finding the optimum alloy compositions considering a large number of property requirements and constraints by systematic exploration of large composition spaces is proposed. It is based on a numerical multi-criteria global optimization algorithm (multistart solver using Sequential Quadratic Programming), which delivers the exact optimum considering all constraints. The CALPHAD method is used to provide the thermodynamic equilibrium properties, and the creep strength of the alloys is predicted based on a qualitative numerical model considering the solid solution strengthening of the matrix by the elements Re, Mo and W and the optimum morphology and fraction of the
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