Abstract: In-situ TiC particle reinforced 6061 aluminum matrix composites were manufactured by contact reaction. Phase analysis and microstructure observation of the in-situ TiCp/6061 composites were conducted by XRD and SEM, respectively. Taking the 6061 aluminum alloy matrix as comparison, the impact of the mass fraction of reinforcing particles on hardness, friction and wear behavior of the in-situ TiCp/6061 composites was explored. The contact reaction was carried out with Ti powder, C powder and Al powder as raw materials, the direct and in-situ formation of TiC particles could be achieved in 6061 aluminum alloy. The in-situ formed TiC particles presented regular polygons with a size of 0.5—1 μm. The increase of TiC particle content would give rise to a notable improvement in hardness of in-situ TiCp/6061 composites. After heat treatment of T6, the hardness of 5wt% TiCp/6061 composites reached 120.5HBS, 28.1% higher than that of 6061 aluminum alloy, which might be attributed to the combined action of dislocation strengthening and fine grain strengthening of the in-situ formed TiC particles on 6061 matrix materials. Meanwhile, the growing mass content of TiC particles would also bring about the enhancement in wear resistance of in-situ TiCp/6061 compo-sites. After heat treatment of T6, and grinding with GCR15 under constant pressures of 100 N for 300 s, the mass loss of matrix 6061 aluminum alloy was twice of that of the 5wt% TiCp/6061 composite. The reason of this phenomenon is that the increase of TiC particles content lead to the reduction of the effective contact area between the grinding material and the composites, thus the in-situ TiCp/6061 composites with higher TiC particle mass content perform satisfactory wear resistance.
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2019, Vol. 33 
