THE MEASUREMENT AND THE INTERPRETATION OF THE FORCE PARAMETERS DURING ECAP PROCESS

Production of ultrafine-grained metal materials rep resents modern and high perspective area of metallurgy. Currently, there ar e several methods for producing these materials. Severe plastic deformation (SPD) is one of the ways to prepare them. Equal-channel angular pressing (ECAP) is one of the most efficien t techniques of SPD for production of bulk ultrafine-grained metals. In the SPD process is imp ortant of measurement deformation forces. The strain gauges sensors measure the strain forces with the necessary accuracy. About progressing action of plastic deformation can be as sumed from the measured deformation forces. These forces include friction in contact points of metal with matrix. The article describes experimental methodic measuring deformation force with strain gages by laboratorial equipment NI cDAQ and commercial software LabView. Deformations curves of the ECAP process are described to alloy EN AW 6060 and of OFHC (Oxygen Free High Conductivity) Cu after zonal purification. Maximum values of deformation forces (Fmax) in the first ECAP passes show