An Investigation on Wear Resistance of SiCp-Reinforced Aluminium Composites Produced by Mechanical Alloying Method

Abstract

In this study, AI-SiC p composites were produced by a mechanical alloying method using SiC p powders up to 20 vol% as a reinforcement. The produced compositions were cold pressed at 630 MPa with a single action and sintered at 560°C for minutes under Ar gas atmosphere. The experimental result showed that the reinforcement phase SiC p was homogeneously dispersed in the Al matrix and the interface between Al matrix and SiC p was well formed. Wear tests were carried out under dry sliding conditions using a pin-on-disk type testing machine at three different loads of ION, 25N and SON and at a sliding speed of 2.08 m/s. Total sliding distance was selected as 400, 800, 1200 and 1600 m. After wear tests, the wear amount was determined by measuring the weight and dimension of specimens. It was seen that the wear rate increased with increasing the applied load from ION to 50N, sliding distance and decreased with increasing SiC p amount. Microstructures and worn surface of Al-SiC p composites were investigated by SEM.

Wear Behaviour of A356/TiAl3 in Situ Composites Produced by Mechanical Alloying

“…The hardness of the AMCs increased with increasing Ti amount. As it is known, the weight loss of a material in a wear test decreases with an increase in the hardness of the material [12,15]. Vencl et al [36] pointed out that the rate of reinforcement should be increased to reduce plastic deformation and to increase hardness of the material.…”

“…Another important method used to improve the mechanical properties of the alloy is to compose stable in situ intermetallic phases in the structure [6][7][8]. In the production of aluminum metal matrix composites (AMMC), which are defined as materials having superior tribological properties, the most common materials used as reinforcement phase are SiC [9][10][11][12][13][14], Al 2 O 3 [15,16], TiB 2 [17,18] and TiC [19]. In the production of many AMMC materials, ex situ techniques are preferred (supplements made to the matrix ex situ in order to increase strength).…”

The Effects of B4C Amount on Hardness and Wear Behaviours of 7075-B4C Composites Produced by Powder Metallurgy Method

“…There are many recent studies that used 7XXX Al alloys as matrix material, which have the highest resistance among all Al alloys [1,[7][8][9]. In these studies, various carbides and oxides (such as SiC, Al 2 O 3 B 4 C, TiC, AlN, TiN, Al 4 C 3 ) have been used as reinforcement phase [10][11][12][13]. Some recent studies used B 4 C as reinforcement phase due to its low density and higher hardness compared to SiC and Al 2 O 3 [10,14,15].…”

Synthesis, Characterization and Dry Sliding Wear Behavior of In-situ Formed TiAl3 Precipitate Reinforced A356 Alloy Produced by Mechanical Alloying Method

“…The hardness of the AMCs increased for the samples synthesized for1h, 4h and 8h. As it is known, the weight loss of a material in a wear test decreases with an increase in the hardness of the material 8,9 . Vencl et al 42 pointed out that the rate of reinforcement should be increased to reduce plastic deformation and to increase hardness of the material.…”

“…The major advantage of the composites called as ex-situ is their stability at high temperature applications. These composite materials provide the performance expected from them without decomposing additional phases in the structure at high temperature applications [8][9][10] . However, the most important disadvantages of these composites are the weak interfaces formed between matrix and reinforcement phase and the non-homogenous distribution of the reinforcement phase 11 .…”