Abstract
How to break through the serious effect of hard and coarse primary Si on the properties of alloy matrix has become a major challenge for motivating the application of high-Si Al alloy piston in automobile lightweight. Herein, we proposed a novel in-situ Si reinforced Al-matrix functionally graded material with Si-rich◎Si-poor coating structure (Si-rich◎Si-poor FGM) by controlling the graded distribution of primary Si under rotating magnetic field . The results show that the segregation behaviors of primary Si and intermetallics (Mg 2 Si, Al 9 FeNi, Al 7 Cu 4 Ni) were directionally controlled during solidification of the multi-component Al–20Si alloy under electromagnetic stirring . The Si-rich◎Si-poor FGM has successfully combined the high tensile strength (296 MPa for Si-poor region) while meeting the gradient design of the mechanical properties (Vickers/Brinell hardness of Si-rich layer was 527%/86% higher than that of Si-poor region). The Si-rich◎Si-poor FGM shows the superior wear resistance when the temperature is less than 300 °C, which meets the limited operating temperature of automotive engine piston. More importantly, the Si-rich◎Si-poor FGM can be further fabricated into complex parts and constructed continuously, which give rise to the large-scale production of high-Si Al alloy piston in automobile lightweight.
Published Version
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