Abstract: When the optimization of material selection for components made of multiphase materials is performed with the help of genetic algorithm, the prematurity of algorithm is easy to be produced and the global optimization solution cannot be obtained, because the initial population is very few. An improved genetic algorithm based on “family tree” is put forward, in which “family tree” is used to evaluate the kinship of chromosomes and reduce the probability of chromosome inbreeding. Validation examples show that the problems mentioned previously are solved and the algorithm developed here is suitable for the optimization of material selection of components made of multiphase components.

Key words: Components made of multiphase materials, Family tree, Improved genetic algorithm, Optimization of material selection, Anti-phase, Coordination control, Inner-inhibition, Outer-interaction, Hip joints motion assist