Effects of Temperature and Strain Rate on Plastic Deformation of Ultrafine-Grained Copper Prepared by Equal-Channel Angular Pressing
نویسندگان
چکیده
Ultrafine-grained (UFG) pure copper of 280 nm grain size was prepared by equal-channel angular pressing. Tensile tests, strain-rate change tests and temperature change tests were conducted on UFG Cu in the temperature range between 77K and 373K. As usual, tensile strength increased as temperature decreased and strain rate increased. The activation energy of deformation increased linearly with the increase in temperature. On the other hand, the activation volume first increased with the increase in temperature from 77K to about 200K while it decreased with temperature above 200K. Therefore, the activation volume shows the maximum value of 180 b3 at about 200K. These experimental results are discussed by considering two different thermally-activated deformation processes. [doi:10.2320/matertrans.M2014172]
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