Abstract
The effect of surface roughness average of hypereutectic aluminum silicon alloys (with 16 wt% Si) on the friction and wear was investigated. Various surface roughness average (Ra) of different degrees was verified as well as three different loads 10, 20 and 30 N, speeds 200, 300 and 400 rpm and relative humidity 77%. Different surface preparation techniques are resulted in different Ra values from (6, 8 and 12) ± 0.05 μm. The contacts were dried sliding and lubricated regime at 2.5 centimeters per second. Surfaces were analyzed with scanning electron microscopy and X-ray dispersive analyses. It was noted that the weighted and volumetric wear rate decreases as degree of roughness decreases, as well as coefficient of friction is considered as a function of the stability state. Wear rate is decreased and the transition stress from high to low wear is increased with increasing surface roughness average. There was a correlation between friction coefficient and hardness.
Highlights
Aluminum-silicon casting alloys are widely used in internal-combustion engines as cylinder heads, cylinder blocks, and pistons
Wear rate is decreased and the transition stress from high to low wear is increased with increasing surface roughness average
One of the factors that affect the age of surfaces is the roughness which is inherent to the process of friction, high roughness means increasing the proportion of friction, adhesion and thereby increases the rate of shear connections between surfaces [3], which leads to increased wear and loss of parts and processors that used in lubricants
Summary
Aluminum-silicon casting alloys are widely used in internal-combustion engines as cylinder heads, cylinder blocks, and pistons. Gupt and Ling [18] have synthesized three aluminum-silicon alloys containing 7, 10 and 19 wt% silicon using a novel technique commonly known as disintegrated melt deposition technique Their results revealed that a yield of at least 80% can be achieved after defacing the shrinkage cavity from the as-processed ingots and demonstrated an increase in matrix microhardness, while 0.2% yield stress decreases in ductility with an increase in silicon content. They investigated the effect of extrusion on Al-19Si alloy and showed a correlation of microstructural characterization and mechanical properties of aluminum-silicon alloys with the amount of silicon and secondary processing technique. All of these are divided into the followings: Section 2 displays the experimental process, while results and discussion are given in Section 3, followed by conclusions
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