EFFECT OF HEATING CONDITIONS ON CONTACT STRESSES WHEN ROLLING GRANULES OF METASTABLE ALUMINUM-ALLOYS

We have studied the effect of the heating temperature and isothermal h olding lime for rapidly solidified high-alloy aluminum alloys on their microstructure, macrohardness, and contact stresses during rolling. W e have found that the relationship between holding time and mean conta ct stress has a minimum that is connected with dissolution and coagula tion of intermetallic phases and silicon crystals. Increasing the hold ing time leads to coarsening of the structure and an increase in the h ardness and rolling force.