Microstructure, Mechanical Properties and Wear Resistance Performance of TiCp/7075 Matrix Composite by Vacuum Stirring
LIU Jingfu1, QI Li1, LI Guanglong2, QU Yingdong2
1 College of Materials Science and Engineering, Liaoning Technical University, Fuxin 123000, China 2 College of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110000, China
Abstract: TiCp/7075 composites were prepared by vacuum assisted stirring casting. Phase analysis and microstructure observation of the composite were carried out by XRD and SEM. The mechanical properties and wear resistance of the composite were studied. The investigation shows that the TiC particles are evenly distributed in the 7075 aluminum alloy, and the grain size of as cast 7075 aluminum alloy are significantly refined. TiC particles make the grains shape of the matrix alloy change from 200 μm dendrites to 100 μm equiaxed shape. The Brinell hardness and tensile strength of the composites are 163HBW and 362 MPa, respectively, which are 20.7% and 20.3% higher than that of the matrix. Strengthening mechanism of the composites is fine grain and particle load share mechanism. The wear resistance of the matrix can be improved effectively by addition of TiC particles. Under 10 N load, the wear loss of the composites is 2.9 mg, which is 54.7% lower than the matrix. During the process of wear test, the exposed TiC particles preferentially contact with the wear-resistant material, reducing the effective contact area between the composites and the wear-resistant material, and improving the wear resistance of the composites.
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2021, Vol. 35 
