Original paper(Vol.49 No.4 pp.433)

Development of Al₂O₃/Cu functionally graded material based on residual stress analysis

Arai Masayuki; Iwata Uichi; Hasegawa Kenji; Kishimoto Kikuo

Abstract:In this study, Al₂O₃/Cu functionally graded materials were tried to fabricated based on the results obtained by numerical material design. Obtained results are summarized as follows.
(1)Residual stress fields in the functionally graded materials were analyzed by finite element analysis, based on actual fabricating process. From some analysis results, it was found that residual stress is reduced by fabricating the functionally graded material with thinner ceramic layer than metal layer.
(2)FGM fracture map, which includes crack initiation criterion obtained from bending strength of Al₂O₃/Cu composite materials, was proposed. It was shown that optimum functionally compositional profile can be found easily by using this map.
(3)It was shown that good functionally graded materials can be fabricated by the FGM fracture map.

Key Words:Functionally graded material, Al2O3/Cu composite material, Residual stress, Finite element analysis, FGM fracture map, Optimum functional composition profile and microstructure