IPEK Mediha Sakarya University

In this study, Cu- 1.5wt.% Cr- 0.5 wt.% Zr alloy was prepared by powder metallurgy (PM) method . Cu-Cr-Zr powders were pressed under 390 MPa uniaxial compression and sintered at 1000 °C for 2h. After the holding time, samples were immediately taken out of furnace and pressed at 850 MPa. Sintered samples were solution-treated at 1000 °C for 15 min and water-quenched. Then, they were deformed 15 % at room temperature and aged at 450, 475 and 500 °C for 2, 4, 6 and 8 h. SEM investigation revealed that, Cr and Zr particles having limited solubility in the Cu distributed homogeneously in copper matrix. XRD analysis showed that each sample (sintered and aged at 475 °C for different times) has same phases: copper and trace Cr2O3. The relative density of sinter-pressed sample increased from 92 % to 94 % by cold deformation. The highest microhardness and electrical conductivity values were obtained in sample sintered and aged at 450 °C for 8 hours.