WEAR BEHAVIOUR OF AA1060 REINFORCED WITH ALUMINA UNDER DIFFERENT LOADS

MARIO ROSENBERGER; ROMINA BORELLI; ALICIA ESTHER ARES; ELENA FORLERER; CARLOS ENRIQUE SCHVEZOV

San Antonio, Texas -USA.

Simposio; THE ROHATGI HONORARY SYMPOSIUM ON SOLIDIIFCATION PROCESSING OF METAL MATRIX COMPOSITES; 2006

The Minerals, Metals and Materials Society (TMS).

The wear behavior of samples of AA1060 aluminum matrix reinforced with 15% ofalumina particles in a range of loads between 4.9 N and 91.2 N, was determined using apin-on-ring machine at a velocity of 2.7 m/s. The counterface was a carbon steel ring of 280HB in hardness. Optical and electronic microscopy, X-Ray energy analysis and hardnessmeasurement were performed in order to characterize the worn samples. A mild wearmechanism is present for loads lower than 80 N and at larger loads the mechanisms changeto a severe mode. In the mild wear regime a Mechanically Mixed Layer (MML), with Ironfrom the counterface and material of the composite, was formed. This MML wasresponsible of the wear resistance of the composite. Two mechanisms were observed as away to increase the resistance of the MML; first hardening by mechanical alloying andstrain hardening, and then an increase in thickness. At a larger load the conditions producedlarge instabilities which prevented the formation of a protective Mechanically Mixed Layer.