Influence of hot forming modes on the structure, mechanical and tribotechnical properties of powder composites of the AL-TIC system

In this work were investigated the structure, phase composition, mechanical and tribotechnical properties of aluminium matrix composites obtained by hot forging. The results of local phase analysis showed that the hot forgin aluminum-matrix composites consist of an aluminium matrix and dispersed titanium carbide inclusions. The HRB hardness values range from 69.1 to 80 (for samples with 45-50 Al (wt. %)) and up to 73.7-76 (55-60 Al (wt. %)) and compressive strengths are σb = 450 - 600 MPa; σ0.2=350 - 509 MPa depending on the composition and preheating temperature. AMCs with sufficiently high strength are capable of plastic deformation ε-5.3-9.19%. The results of tribotechnical studies have shown that when testing a composite paired with copper, the samples without excess carbon wear out intensively due to the mutual adhesion of the aluminium matrix of the composite and the copper. In turn, the composites containing residual carbon showed a resistance of more than 100 times in relation to the compositions without excess carbon.