硬さ測定による金属基傾斜機能材料の組成傾斜評価

抄録

Micro-Vickers hardness measurement is used to establish a method for determining the composition in a functionally graded material (FGM). Materials used in the present study are Al-SiC, Al Shirasu and Al-Al₃Ni systems, which are manufacured by a centrifugal method. The hardness of aluminum matrix markedly increases with an increase of volume fraction of particles in the case of Al-SiC FGM. However the tendency is not soclear for Al-Shirasu and Al-Al₃Ni FGMs. Plastic strain energy due to thermal misfit between matrix and distributed particles is calculated based on the elastoplastic analysis by applying a shell theory after Lee et. al. The hardness is correlated theoretically with composition gradient through the mean plastic strain energy that generates higher disiocation density. It is concluded that the evaluation of the composition gradient of metal-based FGM can be achieved from hardness measurement.