# Specific Erosion Resistance Behaviour of Cold Forged and Angular Extruded Aluminium

## TL;DR

This study compares how two metal forming methods affect erosion resistance in aluminum, finding differences in wear behavior based on the angle of impact.

## Contribution

The paper introduces a comparative analysis of erosion resistance in cold forged and ECAP-treated aluminum using statistical validation.

## Key findings

- ECAP-treated aluminum shows statistically significant mass loss differences at varying erosion angles.
- Forged aluminum exhibits noticeable mass change after 60 minutes of wear at specific angles.
- Erosion mechanisms were examined using scanning electron microscopy to identify structural changes.

## Abstract

Aluminium finds wide application in mechanical engineering due to its low density and corrosion resistance. In this research, aluminium was subjected to two different metal forming technologies—cold forging (upsetting) and equal channel angular pressing (ECAP)—to obtain improvement in its exploitation properties. Parallel to changing mechanical properties by using these two processes, there was a change in the microstructure of the material. The resulting microstructures were examined using an optical microscope. A different treated aluminium was subjected to erosion wear in various time intervals. Wear testing was conducted for two different impingement angles causing abrasive wear and impact wear. The erosion mechanisms were examined by scanning electron microscopy. These results showed that there is no statistically significant difference in erosion wear for different states at the same impingement angle. However, the difference is noticeable at different wear angles. The significance of the difference in wear of the samples treated with the forging and ECAP techniques was validated by statistical analysis with tests of different sensitivities. The results of the t-test showed that ECAPed samples present a statistically significant difference in the loss of mass due to variations in erosion angle during the 30, 45, and 60 min wearing. A substantial difference in the change in sample mass is also visible for the forged state worn for 60 min.