Abstract
The requirements of high-strength, wear-resistance and lightweight of brake drums have been continually increasing in recent years and any specific aluminum alloy or particle-reinforced aluminum matrix composites may not satisfy all the demands. Combining dissimilar materials to play their respective advantages is a solution to this problem. In this study, a compound casting method was used to combine solid SiCp/A357 composite and a liquid 7050 aluminum alloy to prepare an aluminum matrix composite with a layered structure. The ProCAST numerical simulation software was used to predict the heat transfer in compound casting process and guide the preheating temperature of the wear-resistant ring in the experiment. An Optical Microscope (OM) and Scanning Electron Microscope (SEM) were used to observe microstructures around the solid–liquid bonding interface, the element distribution and phase component of which were analyzed by Energy Dispersive Spectroscopy (EDS) and mechanical properties were evaluated by microhardness and shear tests. The results showed that the interface of the layered aluminum matrix composite prepared by this method achieved complete metallurgical bonding and a transition zone formed on the solid surface. After T6 heat treatment, the average shear strength of the interface increased from 19.8 MPa to 33.8 MPa.
Highlights
Aluminum alloys are widely used in automotive and aerospace industries as lightweight materials with the greatest potential to replace steel [1,2,3]
In order to prepare SiCp /A357-7050 layered composite brake drums, 15 wt.%SiCp /A357 composite was used as solid wear-resistant outer layer and 7050 alloy as high strength inner layer
Itofcan be seen from the results that when the composite ring was short, two hot spots appeared in the casting, respectively in the middle and top of the rim of the brake drum
Summary
Aluminum alloys are widely used in automotive and aerospace industries as lightweight materials with the greatest potential to replace steel [1,2,3]. By combining two kinds of metal materials with different properties by special means, the layered composite material can give full play to the advantages of the two materials and overcome their disadvantages to meet the performance requirements of complex working conditions. Rolling can combine plate-like heterogeneous materials at certain temperatures and pressures, such as cold rolling or hot rolling [10]. These methods can obtain a good interface of different metal materials, their application in some composite parts is restricted by complex process and geometric shape [11,12,13]
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