MATERIALS GENOMIC DESIGN OF NOVEL ALLOYS WITH CALPHAD TOOLS

摘要

Integrated Computational Materials Engineering (ICME) technologies and Accelerated Insertion of Materials (AIM) methodologies have been developed and applied to the design of novel alloys for customized properties to meet performance requirement in critical applications. Genomic CALPHAD databases for multicomponent systems have been developed. PrecipiCalc® simulations were performed to optimize the heat treatment process for alloys which incorporate nanoscale precipitates to achieve required strength levels. The comparison of the simulation results with the experimental observations of the microstructure and phase compositions serves as the validation of the databases and models used in the genomic design. After the success with lab-scale buttons, full-scale prototypes of the innovative alloy designs have been produced to accelerate the qualification and to assess the full potential of the novel material. A newly invented high-strength wear-resistant Co-base alloy, as a replacement for Cu-Be alloys in aerospace bushing applications, demonstrates the ICME-based genomic design and AIM-based methodology, with the use of various CALPHAD tools.