Мікроструктура Та Властивості Гарячештампованих Алюмінієвих Композитів З Карбідовмісткою Лігатурою Та Карбідом Титану

Abstract

A. (2018) Microstructure and properties of aluminum composites with carbide-containing master alloy and titanium carbide prepared by hot-forging 2(39), doi: 10.26909/csl.2.2018.4 For the production of alumino-matrix composites, three compositions of the master alloy are selected20Al-16C-64Ti (%, wt.) with the maximum carbon content and the fi nest titanium carbide particles formed after synthesis, 40Al-6C-54Ti (% , wt.) and 45Al-11C-44Ti (% wt.) with a maximum content of aluminum and with diff erent titanium and carbon ratios, to determine the eff ect of the composition of the master alloy on the mechanical properties of hot forged aluminosar composite materials. The Al-TiC composite was obtained to compare it properties with Al-master alloy composite materials. A technological scheme for the production of aluminum matrix composites by the method of hot forging was developed, the regularities of the processes of their structure formation in the volume of consolidated billets, physical and mechanical properties, tribotechnical properties and corrosion resistance have been investigated. The hardness and strength properties of the composites with master alloy are signifi cantly lower than those of samples with TiC, whereas the ductility of the latter is higher. The results of complex tribotechnical tests of hot forged aluminium composites have shown that the materials under study in a pair of friction with CT105 steel undergo signifi cant damage as a result of the implementation of the adhesive wear mechanism. Study of the corrosion resistance of the materials in a 3,5 % solution of NaCl have shown that their corrosion resistance is 1 point (absolutely stable), which signifi cantly exceeds the corrosion resistance of aluminum, Al-TiC composite and one of the most widely used aluminum alloys 1160.In a solution of 3 % NaCl + ml/l HCl, almost all investigated hot stamped aluminum matrix composite materials belong to a group of low-strength or lower-stable. For materials containing 15 % TiC -85 % corrosion resistance decreases to 9th ball, which translates them into a group of unstable. Such a signifi cant drop in corrosion resistance in the second solution is due to the fact that acids, like alkalis, destroy the oxide fi lm on aluminum, and the metal dissolves. This is especially true for acids containing halogens (hydrochloric, sulfuric, hydrofl uoric acid) -their aggressiveness increases with the growth of the mass of halogen.Thus, the corrosion resistance of the studied composite materials improves with the strengthening of their particles of titanium carbide and carbide-containing powdered ligatures of the Al-Ti-C system. However, unlike the 85 % Al-15 % (TiC) composite, samples with a diff erent ligation compound exhibit absolute resistance in a 3,5 % NaCl solution. Presintering slightly improves the corrosion resistance of 85 % Al-15% (TiC) composites, mainly due to the formation of a stronger contact between the matrix material and the reinforcing phase. In a solution of 3 % NaCl + ml/l HCl, these material...