Mechanical and corrosion properties of AlCu matrix hybrid composite materials

Abstract

In this study, AlCu matrix hybride composites with various ratios of boron carbide (B4C), hexagonal boron nitride (hBN), and graphite (Gr) were produced by using hotpressing method. The microstructure, density, mechanical and corrosion properties of these composites were investigated. Optical microscopy, scanning electron microscopy, and X-ray diffraction were used to characterize the microstructures, and the experimental densities of the composites were measured using a helium pycnometer. The mechanical properties including the hardness and transverse rupture strength were investigated using hardness and three-point bending tests, respectively. In addition, the hybrid composites were immersed in an aqueous solution of 3.5 wt.-percent NaCl at pH 3 for potentiodynamic and corrosion rate measurements. These tests revealed that a microstructure in which reinforcing particles are almost homogeneously dispersed in the matrix was obtained. Density measurements have shown that very dense and compact hybrid AMCs are produced. The hardness and transverse rupture strength of the composites were significantly increased by particulate addition to the matrix. Depending on the type and amount of reinforcement material, differences in the corrosion resistance of the hybrid composites have been determined. The results show that AlCu-8B 4 C-2Gr hybrid composite material has the highest corrosion resistance among the composite materials.

Characterization of Functionally Graded Bronze Matrix Ceramic Reinforced Composite Materials

“…Several factors cause a growth in hardness. The hardness of the composite elements, the dispersion strengthening effect and the effect of the hard particles on the movement of dislocations, depending on the mixture rule [25,26]. Since the composite layers are harder than the middle layer, the wear resistance of the composite layers is expected to increase.…”

Effect of hot pressing and reinforcement of TiC and WC on the mechanical properties and microstructure of AlCuFeCrNi HEAs alloy

“…H c = H m f m + H r f r where H c is the hardness of the alloy, H m is the hardness of the matrix, H r is the hardness of the reinforcement element, and f m , f r are the volumetric ratios of the matrix and the reinforcement element, respectively. Hard particles prevent the dislocation movement and increase the strength of the HEAs [37,38]. 4) HEA+TiC (15 wt%), ( 5) HEA+WC (5 wt%), ( 6) HEA+WC (10 wt%), ( 7) HEA+WC ( 15wt%), and (8) HEA+TiC (5 wt%)+WC (5 wt%).…”

Tribological and aging behavior of hybrid Al 7075 composite reinforced with B4C, SiC, and TiB2

“…If only the casting method is used in the production of the Al matrix and B 4 C type reinforcement composite, secondary sintering could be applied to achieve good distribution and wettability [30]. However, the hot pressing method is an effective method to attain good wettability and distribution of composite particles, which in turn lead to enhanced mechanical [31] and wear [32] properties. Kaner reported that materials having high surface energy should be used for good wettability.…”