Effect of Cd on microstructure and dry sliding wear behavior of (Al-12%Si)‎ alloy

الملخص EN

The aim of the present research is to study the effect of cadmium addition on microstructure and wear behavior of the alloy (Al-12 % Si) under dry sliding conditions.

Wear behavior was studied by using the Pin-On- Disc technique under different conditions at applied loads 5-20 N, at constant sliding speed and in constant time.

The steel disc hardness was 35HRc.

All alloys were prepared with different percentages of cadmium (1.0, 2.0, 3.0) wt %.

Also the base alloy was prepared by melting and pouring the molten metal in a metallic mold.

It was found that the cadmium addition to Al-Si matrix decreases the wear rate and improves the wear properties for alloys containing -Cd under loads above 10N.

It was also found that the alloy Al-12 % Si containing 3 % Cd is the best alloy in wear resistance and friction coefficient.

This is due to presence of the Cd-phase as cuboids or hard particles distributed in a eutectic matrix which reduces the friction coefficient at high loads (20N).