Study of dry sliding wear behavior of al-12%si alloy produced by squeeze casting

الملخص EN

The present research deals with study of the effect of applied casting pressure at constant pouring and die preheating temperatures on the microstructure and dry sliding wear behavior of the squeeze cast Al-12 % Si alloy was investigated.

A pin-ondisc tests were conducted at varying loads from 5 to 20 N and a sliding speed of 2.7m / sec for a constant sliding time of 20min.

The results showed that a refinement in the microstructure with increasing the squeeze pressure.

The results showed that the wear rates and coefficient of friction (μ) of the squeeze cast samples are lower than that of the gravity die cast sample.

The results also showed that the density of the specimens decreased with application of a 7.5 MPa applied pressure, but it increased steadily for higher pressures up to 53 MPa.

Increasing the squeeze pressure resulted in increasing the hardness and decreasing the wear rate.

These results were explained based on the densification mechanism brought about by the application of pressure during solidification.