A Study on the Nano-Deformation Characteristics of Grain-Size Controlled Rheology Material Surfaces for Surface Crack Prediction

표면크랙 예측을 위한 결정립 제어 레오로지 소재 표면의 나노 변형특성에 관한 연구

In this study, the deformation characteristics of grain-size controlled rheology materials surfaces were investigated as a part of the research on the surface crack prediction in semi-solid formed automobile components. The microstructure of rheology Al-Si alloys consists of primary and eutectic regions. In eutectic regions the crack initiation begins with initial fracture of the eutectic silicon particles and inside other intermetallic phases. Nano-deformation characteristics in the eutectic and primary region of semi-solid aluminum alloys (356 alloy and 319 alloy) were investigated through the nanoindentation/scratch experiments and the AFM observation.